# US 5,348,927 A · Treatment for virgin phosphorous/vanadium oxidation catalysts

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- Number: US 5,348,927 A
- Document ID: US5348927A
- Status: Granted
- Kind: A
- Application number: 08/024,320
- Filed: 1993-03-01
- Granted: 1994-09-20
- Earliest claimed: 1993-03-01
- Assignees: Scientific Design Company, Inc.
- Inventors: Arie Bortinger
- Web page: https://patentgrep.com/patent/US5348927A

## CPC

- C07C 51/215: of saturated hydrocarbyl groups
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 27/199: with chromium, molybdenum, tungsten or polonium
- B01J 37/10: in the presence of water, e.g. steam
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- Y10S 502/515: Specific contaminant removal
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method of removing chloride from phosphorus/vanadium/oxygen mixed oxide oxidation catalysts comprising treating a chloride containing catalyst comprising phosphorus, vanadium and oxygen with a stream of gas comprising oxygen, steam and an inert gas at flow rate and temperature and for a period of time to substantially reduce the amount of chloride in the catalyst.

## Claims

### Claim 1

A method of removing chloride from phosphorus/vanadium/oxygen mixed oxide oxidation catalysts comprising treating a chloride containing virgin catalyst of the formula:
VP.sub.a Zn.sub.b Mo.sub.c Li.sub.d O.sub.x
wherein a is 0.90 to 1.3, b is 0.001 to 0.15, c is 0.005 to 0.10 and d is 0.001 to 0.15 and x is a determinate number wherein HCl is used as the reducing agent for the vanadium and said catalyst containing up to 1.0 wt % chloride with a stream of gas comprising oxygen, steam and nitrogen and having the composition in the area defined by A-B'-C of FIG. 1 at a temperature in the range of from 250.degree. to 420.degree. C. for 0.5 to 24 hours and to reduce the amount of chloride in the catalyst by at least 75%.

### Claim 2 (depends on 1)

The method according to claim 1 wherein the valance of the vanadium is between +3.5 and +4.5.

### Claim 3 (depends on 1)

The method according to claim 1 wherein the valance of the vanadium is between +3.7 and +4.2.

### Claim 4 (depends on 1)

The method according to claim 1 wherein said inert gas comprises nitrogen.

### Claim 5 (depends on 1)

The method according to claim 1 wherein the catalyst is treated in the form of a powder before being fabricated into final tableted form.

### Claim 6 (depends on 1)

The method according to claim 1 wherein the catalyst is treated in the form of tablets or other shapes.