Composite oxide catalyst, method for producing the same, and method for producing unsaturated nitrile

Patent metadata

Field	Value
Publication number	US-10343146-B2
Application number	US-201314429711-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Sep 27, 2012
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

It is an object of the present invention to provide a composite oxide catalyst which can suppress the generation of CO 2 and CO and improve the yield of an unsaturated nitrile in a method for subjecting propane or isobutane to a vapor-phase catalytic ammoxidation reaction to produce a corresponding unsaturated nitrile, and a method for producing the composite oxide catalyst, and a method for producing an unsaturated nitrile using the composite oxide catalyst. A composite oxide catalyst used for a vapor-phase catalytic oxidation reaction or vapor-phase catalytic ammoxidation reaction of propane or isobutane, the composite oxide catalyst comprising a composite oxide represented by the following composition formula (1):

Mo 1 V a Sb b Nb c W d Z e O n   (1),

wherein the component Z is one or more element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; a, b, c, d, e, and n represent atomic ratios of the elements; and 0.1≤a<0.2, 0.15≤b≤0.5, 0.01≤c ≤0.5, 0≤d≤0.4, 0≤e≤0.2, and 0.60<a/b<1.00.

First claim

The invention claimed is:

1. A composite oxide catalyst used for a vapor-phase catalytic oxidation reaction or vapor-phase catalytic ammoxidation reaction of propane or isobutane, the composite oxide catalyst comprising a composite oxide represented by the following composition formula (1):
Mo 1 V a Sb b Nb c W d Z e O n   (1),

wherein the component Z is one or more element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; a, b, c, d, e, and n represent atomic ratios of the elements; and 0.1 ≤a<0.2, 0.15 ≤b≤0.5, 0.01 ≤c≤0.5, 0 ≤d≤0.4, 0 ≤e≤0.2, and 0.60<a/b<0.85.

2. The composite oxide catalyst according to claim 1 , further comprising 20 to 70% by mass of silica in terms of SiO 2 .

3. A method for producing a composite oxide catalyst comprising a composite oxide represented by the following composition formula (1):
Mo 1 V a Sb b Nb c W d Z e O n   (1)

wherein the component Z is one or more element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; a, b, c, d, e, and n represent atomic ratios of the elements; and 0.1 ≤a<0.2, 0.15 ≤b≤0.5, 0.01 ≤c≤0.5, 0 ≤d≤0.4, 0 ≤e≤0.2 and 0.60 <a/b<0.85,
the method comprising:
(I) a raw material blending step of preparing a raw material blending liquid which comprises Mo, V, Sb, Nb, W, and Z and in which 0.1 ≤a<0.2, 0.15 ≤b≤0.5, 0.01 ≤c≤0.5, 0 ≤d≤0.4, 0 ≤e≤0.2, and 0.60 <a/b<0.85 for the atomic ratios;
(II) a drying step of drying the raw material blending liquid to obtain a dried powder;
(III) a calcining step of calcining the dried powder to obtain a calcined body; and
(IV) a projection substance removing step of removing a projection substance present on a particle surface of the calcined body.

4. The method for producing the composite oxide catalyst according to claim 3 , wherein the raw material blending step (I) comprising the steps of:
(a) preparing an aqueous mixed liquid containing Mo, V, Sb, and the component Z;
(b) adding silica sol and hydrogen peroxide water to the aqueous mixed liquid obtained in the (a) step;
(c) mixing the solution obtained in the (b) step with an aqueous solution containing Nb, dicarboxylic acid, and hydrogen peroxide water, and a W-containing compound; and
(d) adding a powder silica-containing suspension liquid to the solution obtained in the (c) step to age the solution.

5. A method for producing a corresponding unsaturated nitrile by subjecting propane or isobutane to a vapor-phase catalytic oxidation reaction or a vapor-phase catalytic ammoxidation reaction, the corresponding unsaturated nitrile being derived from the propane and isobutene, wherein the composite oxide catalyst according to claim 1 is used.

6. A method for producing a corresponding unsaturated nitrile by subjecting propane or isobutane to a vapor-phase catalytic oxidation reaction or a vapor-phase catalytic ammoxidation reaction, the corresponding unsaturated nitrile being derived from the propane and isobutene, wherein the composite oxide catalyst according to claim 2 is used.

7. The composite oxide catalyst according to claim 1 , wherein 0.60 <a/b<0.79.

8. The composite oxide catalyst according to claim 1 , wherein the component Z is Ce.

Assignees

• Asahi Kasei Chemicals Corp

Inventors

• Ishii Yusuke
• Kadowaki Minoru
• Kato Takaaki

Classifications

• B01J37/0045

  Drying a slurry, e.g. spray drying · CPC title

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• C07C255/08

  Acrylonitrile; Methacrylonitrile · CPC title

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title