# US 9,517,451 B2 · Preparation of propane oxidation catalysts

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- Number: US 9,517,451 B2
- Document ID: US9517451B2
- Status: Granted
- Kind: B2
- Application number: 14/430,600
- Filed: 2013-09-05
- Published: 2015-10-01
- Granted: 2016-12-13
- Earliest claimed: 2012-09-28
- Assignees: Rohm and Haas Company
- Applicants: Rohm and Haas Company
- Inventors: Leonard E. Bogan, Jr.
- Web page: https://patentgrep.com/patent/US9517451B2

## CPC

- B01J 27/0576: {Tellurium; Compounds thereof}
- B01J 23/28: Molybdenum
- B01J 37/0045: {Drying a slurry, e.g. spray drying}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- C07C 51/215: of saturated hydrocarbyl groups
- B01J 37/086: {Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid}
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J 2235/15: X-ray diffraction
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process for preparing a propane oxidation catalyst, the process comprising pre-calcining the catalyst precursor in an oxygen-containing gas at a temperature of less than 330° C. until the weight of the precursor stabilizes to obtain a pre-calcined precursor; then calcining the pre-calcined precursor to obtain the catalyst.

## Claims

### Claim 1

A process for preparing a propane oxidation catalyst, the process comprising: (a) preparing a catalyst precursor; (b) pre-calcining the catalyst precursor in an oxygen-containing gas at a temperature of less than 330° C. until the weight of the precursor stabilizes to obtain a pre-calcined precursor; then (c) calcining the pre-calcined precursor to obtain the catalyst, wherein step (b) is maintained for at least 5 hours, and wherein the catalyst comprises an orthorhombic phase M1 and a pseudo-hexagonal phase M2, and wherein the amount of phase M2 in the catalyst is less than 12%.

### Claim 2 (depends on 1)

The process of claim 1 wherein step (b) is maintained for at least 6 hours.

### Claim 3 (depends on 1)

The process of claim 1 wherein step (b) is maintained for at least 8 hours.

### Claim 4 (depends on 1)

The process of claim 1, wherein the amount of phase M2 in the catalyst is less than 10%.

### Claim 5 (depends on 1)

The process of claim 1, wherein the amount of phase M2 in the catalyst is less than 8%.

### Claim 6 (depends on 1)

The process of claim 1, wherein the amount of phase M2 in the catalyst is less than 7%.

### Claim 7 (depends on 1)

The process of claim 1, wherein the temperature of step (b) is less than 310° C.

### Claim 8 (depends on 1)

The process of claim 1, wherein the catalyst is represented by the formula AaVbNcXdZeOf wherein A is at least one element selected from the group consisting of Mo and W, N is at least one element selected from the group consisting of Te and Sb, X is at least one element selected from the group consisting of Nb, Ta, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pt, Sb, Bi, B, In, As, Ge, Sn, Hf, Pb, P, Pm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, and Z is at least one element selected from the group consisting of Zn, Ga, Ir, Sm, Pd, Au, Ag, Cu, Sc, Y, Pr, Nd and Tb; and wherein, when a=1, b=0.01 to 1.0, c=0.01 to 1.0, d=0.01 to 1.0, e=0 to 0.1 and f is dependent on the oxidation state of the other elements.

### Claim 9 (depends on 1)

The process of claim 1, wherein A=Mo, N═Te, and X═Nb.