# US 2018/0022671 A1 · Chromia based fluorination catalyst

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- Number: US 2018/0022671 A1
- Document ID: US20180022671A1
- Status: Published application
- Kind: A1
- Application number: 15/703,217
- Filed: 2017-09-13
- Published: 2018-01-25
- Earliest claimed: 2005-04-08
- Assignees: Mexichem Amanco Holding S.A. de C.V.
- Applicants: Mexichem Amanco Holding S.A. De C.V.
- Inventors: ANDREW P. SHARRATT; JOHN D. SCOTT
- Web page: https://patentgrep.com/patent/US20180022671A1

## CPC

- C07C 17/206: {the other compound being HX}
- B01J 23/26: Chromium
- C07C 17/21: with simultaneous increase of the number of halogen atoms
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

A chromia-based fluorination catalyst comprising at least one additional metal selected from zinc, nickel, aluminium and magnesium in which from 0.1 to 8.0% by weight of the catalyst is in the form of one or more crystalline compounds of chromium and/or one or more crystalline compounds of the at least one additional metal. The catalyst can be used in processes for producing a fluorinated hydrocarbon.

## Claims

### Claim 1

A chromia-based fluorination catalyst consisting of:
amorphous chromia;
zinc oxide in a total amount of zinc of from 0.5 to 25% by weight of the catalyst; and
crystalline chromium oxide in a total amount of from 0.1 to 2.5% by weight of the catalyst;
which catalyst is supported or unsupported.

### Claim 2 (depends on 1)

A catalyst according to claim 1 having a surface area of at least 50 m2/g.

### Claim 3 (depends on 2)

A catalyst according to claim 2 having a surface area of from 70 to 250 m2/g.

### Claim 4 (depends on 1)

A catalyst according to claim 1 having a sulphate content of less than 10% w/w.

### Claim 5 (depends on 1)

A method for producing a catalyst as defined in claim 1, which method comprises heat treating an amorphous catalyst precursor at a temperature of from 300 to 600° C. for a period of from 1 to 12 hours in an atmosphere of nitrogen or an atmosphere having an oxygen level of from 0.1 to 10% v/v in nitrogen.

### Claim 6 (depends on 1)

A method for prefluorinating a catalyst according to claim 1, which method comprises heat treating the catalyst at a temperature of from 250 to 500° C. for a period of from 1 to 16 hours at atmospheric or superatmospheric pressure in the presence of hydrogen fluoride.

### Claim 7 (depends on 1)

A process for producing a fluorinated hydrocarbon, which process comprises reacting a halogenated hydrocarbon with hydrogen fluoride in the presence of a catalyst as defined in claim 1.

### Claim 8 (depends on 6)

A process for producing a fluorinated hydrocarbon, which process comprises reacting a halogenated hydrocarbon with hydrogen fluoride in the presence of a catalyst produced according to the method of claim 6.

### Claim 9 (depends on 7)

A process according to claim 7 that is carried out at elevated temperature in the vapour phase.

### Claim 10 (depends on 7)

A process according to claim 7 for the production of 1,1,1,2-tetrafluoroethane or penta-fluoroethane.