Title of Invention

A METHOD FOR PRODUCING ALPHA, BETA-UNSATURATED ALDEHYDE OR/AND UNSATURATED CARBOXYLIC ACID

Abstract The present invention relates a method for a method for producing a,~-unsaturated aldehyde or/and unsaturated carboxylic acid characterized by carrying out the vapor-phase catalytic oxidation of an alkane in the presence of a catalyst which is represented by general Formula (1) as shown below Mo VaTibXcYdOe (1) wherein, X represents at least one element selected from the group consisting of Sb and Te; Y represents at least one element selected from the group consisting of Nb, Wand Zr; a, b, c, d and e represent atomic ratios of their respective elements, with 0< a <0.7, 0< b < 0.3, 0 < c < 0.7, 0 d < 0.3 and e is a number determined by the oxidation states of the other elements than oxygen.
Full Text

DESCRIPTION
CATALYST FOR OXIDATION OF ALKANE , PROCESS FOR PREPARING THEREOF AND PROCESS FOR PRODUCING UNSATURATED OXYGEN-CONTAINING COMPOUND
TECHNICAL FIELD
The present invention relates to a catalyst for producing an unsaturated oxygen-containing compound from an alkane, particularly to a catalyst suitable for producing acrolein or acrylic acid and methacrolein or methacrylic acid by the vapor-phase catalytic oxidation of propane and isobutane respectively.
BACKGROUND ART
An unsaturated oxygen-containing compound, including an unsaturated aldehyde such as acrolein and methacrolein or an unsaturated carboxylic acid such as acrylic acid and methacrylic acid, is generally produced by the vapor-phase catalytic oxidation of propylene or isobutylene as the starting material in the presence of an oxidation catalyst. Recently however, it has come to be paid attention to the method efficient for producing an unsaturated oxygen-containing compound by using an alkane such as propane or isobutane as the starting material which is cheaper than propylene or isobutylene, and

there have been proposed various catalysts to use for the said process. A MoVTe type catalyst has been disclosed by JP Laid-open No.279351/1994 , JP Laid-Open No.36311/1998 , and JP Laid-open No.143244/2000. A MoVSb type catalyst has been disclosed by JP Laid-Open No,316023/1997, JP Laid-Open No.0456 64/199 8, JP Laid-Open No.1184 91/1998, JP Laid-Open No.120617/1998, JP Laid-Open No.137585/1998, JP Laid-Open No.285637/1999,and JP Laid-Open No.51693/2000.
The MoVTe type catalyst can give acrylic acid as the final product at a high yield, but is likely to lose the catalytic activity if used at a high temperature. Because the tellurium which is one of the essential components of the said catalyst is easy to be evaporated.
In the manufacturing process of the MoVSb type catalyst, molecular oxygen or hydrogen peroxide is added to increase the acrylic acid yield. However, the disclosed reaction temperature
is as high as 380oC or above, there is a problem that the catalyst does not have a sufficient catalytic activity- Therefore, further improvement in the catalytic activity is needed in view of running cost and catalyst life span.
The various catalysts have been proposed to obtain an unsaturated oxygen-containing compound at a high yield from an alkane. But non of them has reached to a commercially applicable level yet. The commercially applicable catalyst must attain an appropriate

alkane conversion, a good acrylic acid selectivity and finally a sufficient acrylic acid yield. Further, its long term stable performance is needed to be kept.
DISCLOSURE OF THE INVENTION
The present inventors have studied to find out a catalyst for producing an unsaturated oxygen-containing compound such
as a , /3 -unsaturated aldehyde or/and unsaturated carboxylic acid, concretely (meth)acrolein or/and (meth) acrylic acid from an alkane such as a C3-C8 alkane, concretely a C3 or C4 alkane, that is, propane or isobutane. As a result, it has been found out that the objective unsaturated oxygen-containing compound can be produced at a lower temperature in the presence of a catalyst comprising a complex oxide containing molybdenum, vanadium, titanium and specif ic meral( s ) . The present invention is completed based on this finding. Namely the present invention is as follows:
(1) A catalyst for producing an unsaturated oxygen-containing
compound from an alkane, comprising Mo, V, Ti and Sb or Te as
the indispensable active component elements.
(2) A catalyst according to the above item (1), further
comprising at least one element selected from the group
consisting of Li, Na, K, Rb, Cs, Mg, Ca and Sr as the active
component element.
(3) A catalyst according to the above item (1), wherein said

catalyst is represented by general Formula (1) as shown below.
Mo1.0 Va Tib Xc Yd- Oe ( 1 wherein, X represents at least one element selected from the group consisting of Sb and Te; Y represents at least one element selected from the group consisting of Nb, W and Zr; a, b, c, d and e represent atomic ratios of their respective elements,
with 0 (4) A catalyst according to the above item (2), wherein said
catalyst is represented by general Formula (2) as shown below.
Mo. .0 Va Tib Xc Yd Zf Oe (2)
wherein X, Y, a, b, c, d and e show the same meanings as in the
formula (1). Z represents at least one element selected from
the group consisting of Li, Na, K, Rb, Cs, Mg, Ca and Sr and
f is an atomic ratio of Z, with 0 (5) A method for preparing the catalyst described in the above
item (1) or (2), comprising a process for mixing starting
material compounds containing elements (active component
elements) of said catalyst with water to prepare a slurry
solution and a process for heating and pressuring said slurry
solution.
(6) A method according to the above item (5), comprising
calcining the product obtained by said heating and pressuring,
wherein said calcining comprises the first calcining process

carried out in the presence of oxygen gas and the second calcining process carried out in the presence of inert gas. (7) A method according to the above item (6) , wherein a temperature difference between said first calcining process and
said second calcining process is 150-400°C,
( 8) A method according to the above item ( 5) , wherein said first
calcining process is carried out at 250-350°C and said second calcining process is carried out at 500-650°C.
(9) A catalyst according to the above item (1) or (2), wherein
said catalyst is used for producing acrolein and/or acrylic acid
from propane.
(10) A complex oxide catalyst comprising Mo, V, Ti and Sb or
Te as the indispensable active component elements, having a
needle crystal form.
(11) A method for producing an unsaturated oxygen-containing compound by the vapor-phase catalytic oxidation of an alkane, characterized by using a catalyst according to any one of the above items (1)-(3) .
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described in detail below.
The catalyst of the present invention comprises a complex oxide containing Mo, V, Ti and Sb or Te (hereinafter called as the A element group) as the indispensable active component elements and the complex oxide may contain the other active

component elements, Other active component elements are not limited to any particular ones. The complex oxide generally contains any one of Sb and Te, but may contain the both. When containing Sb, the specific surface area of the catalyst is likely to increase in comparison with the one which does not contain Sb. The said increase in the specific surface area contributes to the high catalytic activity (high conversion). When containing Te as a component element of the catalyst, on the other hand, the specific surface area of the catalyst does not increase very much. The obtained catalyst, in comparison with the one which contains Sb, has a higher catalytic activity at a little higher reaction temperature. A target compound such as acrylic acid can be obtained with high conversion and good selectivity. As mentioned above, however, it needs to be carefully watched not to lose the catalytic activity because Te is likely to be evaporated.
One of the preferable examples of the present invention is a catalyst containing, in addition to the elements of the A element group, at least one element selected from the group (hereinafter called as the B element group) consisting of Li, Na, K, Rb, Cs , Mg, Ca and Sr. Among these elements of the B element group, K and Rb are preferable, and K is more preferable. The catalyst containing any element(s) of the B element group has a higher acrylic acid selectivity than the catalyst containing the elements of the A element group only.

The method for manufacturing the catalyst of the present invention is not limited to any particular one. The catalyst can be produced, for example, by a method that the starting material compounds, containing the catalyst composing element which can be either singular or plural (hereinafter called the starting material compounds), are mixed with water to prepare a slurry solution and then the slurry solution is dried and calcined if necessary. The calcining temperature is generally
300-900°C, and the calcining time is generally 1-30 hours. The more preferable method for manufacturing the catalyst of the present invention is to prepare the slurry solution as mentioned above, successively the slurry solution is heated, pressured and then dried.
The starting material compound to use for manufacturing the catalyst of the present invention is not limited to any particular one, provided it can be calcined under air to decompose into an oxide.
The starting material compound for an element of the A element group includes a molybdenum-containing compound such as ammonium molybdate, molybdenum trioxide, molybdic acid and sodium molybdate; a vanadium-containing compound such as vanadium oxide, ammonium vanadate, vanadyl oxosulfate; a titanium-containing compound such as titanium oxide, titanium ammonium oxalate and titanium sulfate; an antimony-containing compound such as antimony trioxide, antimony sulfate and

antimony acetate; and a tellurium-containing compound such as tellurium dioxide and telluric acid.
The starting material compound for an element of the B element group includes the oxide, the chloride, the sulfate, the nitrate, the acetate, carbonate or the hydroxide of the element of the B element group. It includes concretely lithium oxide, lithium chloride, lithium nitrate, lithium carbonate, lithium hydroxide, sodium oxide, sodium chloride, sodium nitrate, sodium carbonate, sodium hydrogen carbonate, sodium hydroxide, potassium oxide, potassium chloride, potassium nitrate, potassium carbonate, potassium hydrogen carbonate, potassium acetate, potassium hydroxide, rubidium carbonate, rubidium nitrate, rubidium oxide, rubidium hydroxide, cesium carbonate, cesium nitrate, cesium acetate, cesium oxide, cesium hydroxide, calcium carbonate, calcium hydrogen carbonate, calcium nitrate, calcium acetate, calcium oxide, calcium hydroxide, strontium carbonate, strontium nitrate, strontiiim acetate, strontium oxide and strontium hydroxide.
The catalyst of the present invention may contain other active component element(s) than the elements of the A element group and the B element group. At least one element selected from the group (hereinafter called the C element group) consisting of Nb, W and Zr is preferable for the other active component element. The starting material compound for this optional element includes the oxide, the chloride, the sulfate

and the nitrate of the optional component element. It includes concretely niobic acid, niobium oxide and niobium hydrogen oxalate for a starting material compound of niobium; ammonium paratungstate, tungstic acid and tungsten oxide for a starting material compound of tungsten; and zirconium oxide, zirconium nitrate and zirconium acetate for a starting material compound of ^zirconium. If any ammonium salt is used for a starting material compound, an appropriate preparation condition is preferable to determine so that the catalyst may contain no remaining ammonium group.
The complex oxide composing a catalyst of the present invention may have any optional constituent provided it contains the elements of the A element group. The complex oxide, if it contains a combination of the elements of the A element group with any elements of the C element group, has preferably a composition represented by formula (1) as shown below,
Mo1.0Va Tiv, Xc Yd Oe (1)
wherein X represents at least one element selected from the group consisting of Sb and Te; Y represents at least one element selected from the group consisting of Nb, W and Zr; a, b, c, d and e represent atomic ratios of their respective elements,
with 0 The complex oxide, if it contains further any elements of

the B element group, has preferably a composition represented by formula (2) as shown below,
Mo,.o VaTi, Xc Yd Zf Oe (2)
wherein X, Y, a, b, c, d and e show the same meanings as in the
formula (1). Z represents at.least one element selected from
the group consisting of Li, Na, K, Rb, Cs, Mg, Ca and Sr; f is
an atomic ratio of Z, with 0 As described above, the catalyst of the present invention can be prepared by mixing the compounds containing active component element{s) with water to prepare a slurry solution followed by drying. But the catalyst is preferably prepared by a hydrothermal synthesis method including a process for heating and pressuring the slurry solution before drying.
The powder obtained by the hydrothermal synthesis method is observed by an electron microscope to have an appearance of needle crystal. Such a crystal is generally not observed by an electron microscope when the hydrothermal synthesis method is not carried out. Therefore, it can be thought the needle crystal was brought about by the hydrothermal synthesis method.
According to the hydrothermal synthesis method, starting material compounds are generally dissolved or dispersed in
water in temperature between the normal temperature and 100oC to prepare a slurry solution, which is then treated in an autoclave. The amount of water to use, though it is not particularly limited provided it is sufficient to prepare a

slurry solution, is generally 0.5-20 part by mass, preferably 1-10 part by mass, more preferably 1-6 part by mass relative to 1 part by mass of the starting material compounds.
The hydrothermal synthesis is not limited to any particular one provided it is a treatment for general hydrothermal reaction The above slurry solution may be heated at a high temperature
of more than 100°C in an autoclave to treat for the hydrothermal reaction. The reaction may be carried out in air, but it is preferable that the air existing in the autoclave is replaced partly or wholly with an inert gas such as nitrogen gas and helium gas before starting the reaction. The reaction temperature for the hydrothermal synthesis is generally 110°C or more, preferably 130°C or more, more preferably 140°C or more, and generally 400°C or less, preferably 300°C. or less, more preferably 250°C or less. The reaction time is generally 1-100 hours.
The pressure within the autoclave is usually a saturated vapor pressure, but optionally may be higher than the saturated vapor pressure, and the slurry solution may be stirred throughout the hydrothermal synthesis.
After the hydrothermal reaction terminates, the reaction solution is cooled to form a solid product, which is then separated and dried. The method for separating the product is not limited to any particular one provided it can separate solid from liquid, and is preferably to filtrate, wash and dry.

The product thus obtained may be used for a catalyst of the present invention as it is, but is preferably treated with the calcining to complete a catalyst of the present invention. The
calcining treatment may be carried out by one step at 300-900°C , for 1-30 hours in air,, but is preferably carried out by two steps in their respective different atmospheres as described below. The temperature difference between the first calcining treatment and the second calcining treatment is preferably 150^C or more, more preferably 200°C or more and is preferably 500^C or less, more preferably 400°C or less. The first calcining treatment is carried out at 200°C or more and 400°C or less, preferably at 250-350°C for 0.5-12 hours in the presence of oxygen gas (for example, in air) . The second calcining treatment
is carried out at 400°C or more and 700°C or less, preferably at 500-650°C for 0.5-10 hours in an inert gas such as nitrogen and helium.
There are some cases that the two calcining treatments lower the catalytic performance if carried out outside the above ranges of calcining temperature and time. It is undesirable especially because it lowers an unsaturated oxygen-containing compound selectivity-
The complex metal oxide obtained after calcining treatment may be used for a catalyst of the present invention as it is, but is preferably pulverized to use depending on the cases.
The catalyst of the present invention thus obtained is a

needle crystal having a specific surface area of 1-50 m/g.
The catalyst of the present invention is presumed to increase the catalytic activity by containing Ti together with Mo, V and Sb or Te as a component element. Further, when the methods of the hydrothermal synthesis and the two steps calcinations are applied in a manufacturing process of a catalyst of the present invention, the preferable effect was brought about in the catalytic activity compared with the cases in which the above mentioned methods have not been applied- It is thus presumed that the combination of those two methods and the above mentioned component elements brings about the effective result in the activity of the catalyst.
A catalyst of the present invention that contains at least one element selected from the B group also can be obtained by the following method. The compounds containing the catalyst composing elements, excluding the elements of the B element group, are subjected to the hydrothermal synthesis and the calcination as described above to get a calcinated powder. The powder is dispersed in a solution containing the elements of the B element group (an aqueous solution or an aqueous dispersion of compounds containing the elements of the B element group) , filtered, washed and dried to get the catalyst of the present invention. The catalyst obtained after drying may be further calcined.
The catalyst thus obtained can be suitably used for

producing an unsaturated oxygen-containing compound such as acrolein, acrylic acid or methacrolein, methacrylic acid by the vapor-phase catalytic oxidation of an alkane (preferably a C3-C8 alkane, more preferably a C3-C4 alkane) such as propane or isobutane. The catalyst can be most suitably used for producing acrolein or acrylic acid from propane. In the present invention, an unsaturated oxygen-containing compound means a carbonyl group-containing compound, preferably a compound having both an ethylenic unsaturated bond and a carbonyl group. When producing (meth)acrolein and/or (meth)acrylic acid as the target compound, gases other than the target compound produced in the process are propylene and acetic acid. The propylene is possibly formed with a selectivity of about 10-30%. The target acrolein or acrylic acid, for example, can be obtained from the propylene in the succeeding process by using a catalyst for the vapor-phase catalytic oxidation of propylene-
The composition ratio (mole ratio) of the raw material gases for the vapor-phase catalytic oxidation reaction is not limited to any particular one. However, alkane:oxygen:water vapor:dilution gas is generally 1:0.1-10:0-70:0-20, preferably 1:0.5-3,0: 3.0-20:0-10. The preferable dilution gas includes nitrogen and carbon dioxide gas.
The vapor-phase catalytic oxidation reaction may be carried out either under a pressure or a reduced pressure, but is preferably proceeded under an atmospheric pressure. The

reaction temperature is generally 250-450 °C , preferably 280-420°C, and more preferably 300-450°C.
The space velocity (SV) for supplying the raw material gas
is generally 100-100,000h r-1, preferably 400-30,000hr-1. The catalyst of the present invention is applicable for any reaction style of fixed bed, fluid bed and moving bed. For a fixed bed reaction vessel, a coated catalyst obtained by coating the catalyst powder on a spherical carrier made of silica, alumina, silicone carbide and the like, or a molded catalyst obtained by tableting the catalyst powder is profitably used. For a fluid bed or moving bed reaction vessel, the particle catalyst of a complex metal oxide prepared by further adding a reaction-inactive material such as silica to increase abrasion resistance is profitably used, wherein the particle catalyst has a size of about tens micron uniformly. The catalyst of the present invention can restrain an alkane conversion to keep a high selectivity to the target unsaturated oxygen-containing compound in the reaction, and can also be used in a reaction system for recycling an unreacted alkane in the reaction vessel after separating the reaction product.
EXAMPLE
The present invention will be described below in detail by the examples, but is not limited to the examples unless beyond the gist of the present invention.

In the examples, propane conversion and acrylic acid selectivity have their respective definitions as follows: Propane conversion (mol%) = ( moles of propane supplied - moles of unreacted
propane)/( moles of propane supplied) X 100
Acrylic acid selectivity (mol%)
=( moles of acrylic acid produced)/ (moles of propane supplied
- moles of unreacted propane) X 100
The catalyst composition was calculated based on a ratio of added starting material compounds (excepting K as measured by the emission spectroanalysis).
Example Al
Preparation of catalyst
Ammonium molybdate( 6. OOg ) was dissolved in 30ml of distilled water. Antimony sulfate(0.85g ) was added to the
solution at 80°C under stirring, followed by adding 2.53g cf vanadyl oxosulfate and 0.22g of titanium ammonium oxalate further. After sufficient stirring, the solution was put in an autoclave (volume capacity 60ml) and hydrothermal synthesis was carried out at 175°C for 24 hours. The product thus obtained was filtered to separate, washed, dried at 40°C for a day, calcined at 2 80°C for 1 hour under air stream and calcined successively,at 600°C for 2 hours under nitrogen stream to get a catalyst of the* present invention having a composition

(excluding oxygen, hereinafter likewise) of Mo1.0 V0.3 Tio.025 Sb0.1 .
Estimate test of the catalysts
A fixed bed flow type reaction vessel was used. The catalyst (1.2ml) was pulverized sufficiently, diluted with 3,6ml of silicone carbide powder and packed in a Pyrex tube having an inner diameter of 12mm. A raw material mixture gas composed of propane, oxygen, water vapor and nitrogen was flowed through the tube at a flow rate of propane/oxygen/water vapor/nitrogen
=3/4.5/21/18 (ml/min) to react at 320°C. The reaction product was analyzed by gas chromatography.
Specific surface area measurement
The flow Sorp 12300 made by Micro Meritics was used to measure. About 0.3g of the catalyst was previously treated at
200°C in an inert gas. A nitrogen/helium mixture gas was flowed to measure the specific surface area on the base of nitrogen
absorption.
The results of the estimate test of the catalyst and specific surface area measurement are shown in Table 1.
Example A2
The catalyst of the present invention having a composition of Mo1.0V0.3 Tio.025 Sbo.i was obtained by the same way as described in the Example Al, except that 0.21g of titanium( H ) sulfate was

used in place of 0.22g of titanium ammonium oxalate.
With respect to the catalyst obtained, the estimation test and specific surface area measurement were carried out in the same way as in Example Al. The results are shown in Table 1.
Example A3
The catalyst of the present invention having a composition of Mo1.0Vo.3 Tio,o25 Sb0.1 was obtained by the same way as described
in Excunple Al, except that 0 . 28g of titanium( II ) sulfate was used in place of 0.22g of titanium ammonium oxalate.
With respect to the catalyst obtained, the estimation test and specific surface area measurement were carried out in the same way as in Example Al. The results are shown in Table 1.
Comparative Example 1
The catalyst having a composition of Mo1.0V0.3 Sbo.i for comparison was obtained by the same way as described in the Example Al, except no titanium ammonium oxalate was added.
With respect to the catalyst obtained, the estimation test and specific surface area measurement were carried out in the same way as in Example Al. The results are shown in Table 1.
Example A4
The catalyst of the present invention having a composition of Mo1.0Vo.3 Tio.025 Sbo.i Nbo.025 was obtained by the same way as

described in the Example Al, except 0.15g of niobic acid was added after addition of the titanium ammonium oxalate in Example Al.
With respect to the catalyst obtained, the estimation test and specific surface area measurement were carried out in the same way as in Example Al. The results are shown in Table 1.
Example A5
The catalyst of the present invention having a composition
of Mo1.0Vo.3 Ti
0.025 Sbo.i Wo.0 25 was obtained by the same way as
described in the Example A4, except 0.21g of tungstic acid was used in place of 0.15g of niobic acid in Example A4.
With respect to the catalyst obtained, the estimation test and specific surface area measurement were carried out in the same way as in Example Al, The results are shown in Table 1.
Example A6
The catalyst of the present invention having a com.position of Mo1.0Vo.3 1T10.025 Sbo.i Zro.025 was obtained by the same way as described in the Example Al, except 0.29g of zirconium sulfate was used in place of 0.15g of niobic acid in Example A4,
With respect to the catalyst obtained, the estimation test and specific surface area measurement were carried out in the same way as in Example Al. The results are shown in Table 1.


Example A7
Ammonium molybdate(6.00g ) was dissolved in 30ml of distilled water. Tellurium dioxide (0.85g ) was added to the solution at room temperature under stirring, followed by adding 4.21g of vanadyl oxosulfate, 1.65g of niobium hydrogen oxalate and 0.22g of titaniiim ammonium oxalate further. After sufficient stirring, the solution was put in an autoclave (volume capacity 60ml) and hydrothermal synthesis was carried out at 175°C for 24 hours . The product thus obtained was filtered to separate, washed, dried at 40°C for a day, calcined at 300°C for 2 hours under air stream and calcined successively at 600°C for 2 hours under nitrogen stream to get a catalyst of the present

invention having a composition of MO1.0 V0.5 Tio.oas Teo.17 Nbo.osa.
With respect to the catalyst obtained, the specific surface
area measurement was carried out in the same way as in Example
Al. The obtained specific surface area was 3 m2/g.
Further, the estimation test of catalyst obtained was carried out in the same way as in Example Al except the reaction
temperature was changed to 380°C. The propane conversion was 42% and acrylic acid selectivity was 60%.
Example Bl
Preparation of catalyst
Ammonium molybdate (6.00g ) was dissolved in 30ml of distilled water. Antimony sulfate(0.8 5g ) was added to the
solution at 80°C under stirring, followed by adding 2.53g of vanadyl oxosulfate, 0.22g of titanium ammonium oxalate and 0.08g of potassium nitrate further. After sufficient stirring, the solution was put in an autoclave (volume capacity 60ml) and
hydrothermal synthesis was carried out at 175°C for 24 hours. The product thus obtained was filtered to separate, washed,
dried at 40°C° for a day, calcined at 280°C for 1 hour under air stream and calcined successively at 600°C for 2 hours under nitrogen stream to get a catalyst of the present invention having a composition of Mo1.0V0.3 Tio.025 Sbo.1K0.015.
Estimate test of the catalyst

The reaction tests were carried out in the same way as in Example Al, except that the reaction temperature was changed to 360°C, The results are shown in Table 2.
Example B2
The catalyst of the present invention having a composition of Mo1.0Vo.3 Tio.025 Sbo.i Rbo.ois was obtained by the same way as described in the Example Bl, except that 0.12g of rubidium nitrate was used in place of 0.08g of potassium nitrate.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.
Example B3
The catalyst of the present invention having a composition of Mo1.0Vo.3 Tio.025 Sbo.i Cso.015 was obtained by the same way as described in the Example Bl, except that 0.15g of cesium nitrate was used in place of 0.08g of potassium nitrate.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.
Example B4
The catalyst of the present invention having a composition of Mo1.0Vo.3 Tio.025 Sbo.i Ko.oio was obtained by the same way as

described in the Example Bl, except the amount of potassium nitrate was changed from 0.08g to 0.03g.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.
Example B5
The catalyst of the present invention having a composition
of MOi. 0 VQ .3 Tio,025
Sb
0.1 KQ. 027 was obtained by the same way as
described in the Example Bl, except the amount of potassium nitrate was changed from O.OSg to 0.16g.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2,
Example B6
The catalyst of the present invention having a composition of Mo1.0Vo.3 Tio.025 Sbo.i Ko.050 was obtained by the same way as described in the Example Bl, except the amount of potassium nitrate was changed from O.OSg to 0.24g.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.
Example B7

Ammonium molybdate( 6.00g ) was dissolved in 30ml of distilled water. Antimony sulfate(0.85g ) was added to the
solution at 80°C under stirring, followed by adding 2.53g of vanadyl oxosulfate, 0.22g of titanium ammonium oxalate, 0.15g of niobic acid and 0.16g of potassium nitrate further. After sufficient stirring, the solution was put in an autoclave (volume capacity 60ml) and hydrothermal synthesis was carried out at 175°C for 24 hours . The product thus obtained was filtered to separate, washed, dried at 40°C for a day, calcined at 280°C for 1 hour under air and calcined successively at 600°C for 2 hours under nitrogen gas to get a catalyst of the present invention having a composition of Mo1.0V0.3 Tio.025 Sbo.i Nbo.025
Ko.046.
The estimation test of the catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.
Example 38
The catalyst of the present invention having a composition of Mo1.0V0.3 Tio.025 Sbo.i Wo.025 Ko.030 was obtained by the same way as described in the Example B7, except 0.21g of tungstic acid was used in place of 0.15g of niobic acid in Example B7.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.

Example B9
The catalyst of the present invention having a composition of Mo1.0 Vo.3 Tio.025 Sbo.i Zro.025 K0.029 was obtained by the same way as described in the Example B7, except 0.29g of zirconium sulfate was used in place of 0,15g of niobic acid in Example B7.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2.
Example BIO Preparation of catalyst
Ammonium molybdate(6.OOg) was dissolved in 30ml of distilled water. Antimony sulfate(0.85g ) was added to the
solution at 80°C under stirring, followed by adding 2.53g of vanadyl oxosulfate and 0.22g of titanium ammonium oxalate further. After sufficient stirring, the solution was put in an autoclave (volume capacity 60ml) and hydrothermal synthesis was carried out at 175t3 for 24 hours. The product thus obtained was filtered to separate, washed, dried at 40°C for a day, calcined at 280°C for 1 hour under air stream and calcined successively at 800°C for 2 hours under nitrogen stream to get a complex metal oxide.
The complex metal oxide obtained was dispersed in 100ml of

the aqueous solution containing 1.18g of potassium nitrate.
This mixture was filtered to separate, washed and dried at 40°C for 1 day to obtain a catalyst of the present invention having
a composition of Mo1.0 V0.3 Tio.025 Sbo.i K0.024.
The estimation test of catalyst obtained was carried out in the same way as in Example Bl. The results are shown in Table 2,

INDUSTRIAL APPLICABILITY
A catalyst of the present invention has a high activity and

is therefore very useful as a catalyst for producing an unsaturated oxygen-containing compound by the vapor-phase catalytic oxidation reaction of an alkane.



CLAIMS
1. A catalyst for producing an unsaturated oxygen-containing compound from an alkane, comprising Mo, V, Ti and Sb or Te as the indispensable active component elements-
2. A catalyst according to Claim 1, further comprising at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca and Sr as the active component element.
3, A catalyst according to Claim 1, wherein said catalyst is represented by general Formula (1) as shown below.
Mo i. 0 Va Tib Xc Yd Oe (1)
wherein, X represents at least one element selected from the
group consisting of Sb and Te; Y represents at least one element
selected from the group consisting of Nb, W and Zr; a, b, c,
d and e represent atomic ratios of their respective elements,
with 0 4. A catalyst according to Claim 2, wherein said catalyst is
represented by general Formula (2) as shown below,
MOi.o Va Tib Xc Yd Zf Oe (2)
wherein X, Y, a, b, c, d and e show the same meanings as in the
formula (1), Z represents at least one element selected from
the group consisting of Li, Na, K, Rb, Cs, Mg, Ca and Sr and
f represents an atomic ratio of Z, with 0 5. A method for preparing the catalyst described in Claim 1 or

2, comprising a process for mixing starting material compounds containing elements (active component elements) of said catalyst with water to prepare a slurry solution and a process for heating and pressuring said slurry solution. 6. A method according to Claim 5, comprising a process for calcining the product obtained by said heating and pressuring, wherein said process for calcining comprises the first calcining process carried out in the presence of oxygen gas and the second calcining process carried out in the presence of inert gas.
7. A method according to Claim 6, wherein a temperature
difference between said first calcining process and said second
calcining process is 150-400tr,
8. A method according to Claim 5, wherein said first calcining
process is carried out at 250-350oC and said second calcining process is carried out at 500-650oC.
9, A catalyst according to Claim 1 or 2, wherein said catalyst
is used for producing acrolein and/or acrylic acid from propane.
10. A complex oxide catalyst comprising Mo, V, Ti and Sb or Te
as the indispensable active component elements, having a needle
crystal form.
11. A method for producing an unsaturated oxygen-containing compound by the vapor-phase catalytic oxidation of an alkane, characterized by using a catalyst according to any one of Claim 1-3.

12. A catalyst for producing an unsaturated oxygen-containing
compound from an alkane substantially as herein described and
exemplified.
13. A method for preparing the catalyst substantially as herein
described with reference to the accompanying drawings.
Dated this 18 day of June 2003


Documents:

962-chenp-2003-abstract.pdf

962-chenp-2003-claims duplicate.pdf

962-chenp-2003-claims original.pdf

962-chenp-2003-correspondnece-others.pdf

962-chenp-2003-correspondnece-po.pdf

962-chenp-2003-description(complete) duplicate.pdf

962-chenp-2003-description(complete) original.pdf

962-chenp-2003-form 1.pdf

962-chenp-2003-form 26.pdf

962-chenp-2003-form 3.pdf

962-chenp-2003-form 5.pdf

962-chenp-2003-other documents.pdf

962-chenp-2003-pct.pdf


Patent Number 206278
Indian Patent Application Number 962/CHENP/2003
PG Journal Number 26/2007
Publication Date 29-Jun-2007
Grant Date 23-Apr-2007
Date of Filing 18-Jun-2003
Name of Patentee M/S. NIPPON KAYAKU KABUSHIKI KAISHA
Applicant Address 11-2, FUJIMI 1-CHOME, CHIYODA-KU, TOKYO 102-8172
Inventors:
# Inventor's Name Inventor's Address
1 KOBAYASHI,YOMOPAKI, 1329-1,OOAZA-KOORI, SANYO-CHO, ASA-GUN, YAMAGUCHI 757-0002
2 SEO,YOSHIMASA 2959-1 OOAZA-KOORI, SANYO-CHO, ASA-GUS YAMAGUCHI 757-0002
PCT International Classification Number B 01J 23/28
PCT International Application Number PCT/ JP01/11180
PCT International Filing date 2001-12-20
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2000-391078 2000-12-22 Japan
2 2001-94513 2001-04-06 Japan
3 2001-108122 2001-04-06 Japan