# US 8,540,898 B2 · Catalyst for reverse shift reaction and method for producing synthesis gas using the same

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- Number: US 8,540,898 B2
- Document ID: US8540898B2
- Status: Granted
- Kind: B2
- Application number: 13/472,644
- Filed: 2012-05-16
- Published: 2012-09-13
- Granted: 2013-09-24
- Earliest claimed: 2009-11-27
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Yoshinori Saito
- Inventors: Yoshinori Saito
- Web page: https://patentgrep.com/patent/US8540898B2

## CPC

- B01J 23/02: of the alkali- or alkaline earth metals or beryllium
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/007: {Mixed salts}
- B01J 35/612: {less than 10 m2/g}
- C01B 32/40: Carbon monoxide
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

There are provided a catalyst for reverse shift reaction which has excellent durability at a high temperature, can suppress generation of a methanation reaction, and can efficiently generate a reverse shift reaction to produce a synthesis gas including carbon monoxide and unreacted hydrogen with a reduced methane content, and a method for producing a synthesis gas using the catalyst for reverse shift reaction. The composition of the catalyst for the reverse shift reaction includes a composite oxide containing at least one alkali earth metal selected from the group consisting of Ca, Sr and Ba and at least one transition metal selected from the group consisting of Ti and Zr. A raw material gas containing carbon dioxide and hydrogen is contacted with the catalyst for reverse shift reaction at a temperature of 700° C. or higher.

## Claims

### Claim 1

A method for producing a synthesis gas, comprising contacting a raw material gas comprising carbon dioxide and hydrogen with a catalyst for reverse shift reaction which comprises a composite oxide containing at least one alkali earth metal selected from the group consisting of Ca, Sr, and Ba, and at least one transition metal selected from the group consisting of Ti and Zr at a temperature of 700° C. or higher.

### Claim 2 (depends on 1)

The method for producing a synthesis gas according to claim 1 in which the raw material gas has a hydrogen to carbon dioxide volume ratio greater than 1:1.

### Claim 3 (depends on 2)

The method for producing a synthesis gas according to claim 2 further comprising separating at least one of CO2 and H2O from the synthesis gas resulting from the reverse shift reaction.

### Claim 4 (depends on 1)

The method for producing a synthesis gas according to claim 1, further comprising separating at least one of CO2 and H2O from the synthesis gas resulting from the reverse shift reaction.

### Claim 5 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the composite oxide is a perovskite.

### Claim 6 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the alkali earth metal comprises Ca.

### Claim 7 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the alkali earth metal comprises Sr.

### Claim 8 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the alkali earth metal comprises Ba.

### Claim 9 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the transition metal comprises Ti.

### Claim 10 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the transition metal comprises Zr.

### Claim 11 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the catalyst is SrTiO3.

### Claim 12 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the catalyst is SrZrO3.

### Claim 13 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the catalyst is BaZrO3.

### Claim 14 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the catalyst is CaZrO3.

### Claim 15 (depends on 1)

The method for producing a synthesis gas according to claim 1, wherein the composite oxide is a mixture of two different perovskites.

### Claim 16 (depends on 15)

The method for producing a synthesis gas according to claim 15, wherein the perovskites are SrTiO3 and SrZrO3.

### Claim 17 (depends on 1)

The method for producing a synthesis gas according to claim 1 in which the temperature is 700° C. to 1100° C.