# US 11,439,981 B2 · Catalyst for hydrolysis of carbonyl sulfide and method of producing same

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- Number: US 11,439,981 B2
- Document ID: US11439981B2
- Status: Granted
- Kind: B2
- Application number: 16/958,428
- Filed: 2018-11-30
- Published: 2021-03-04
- Granted: 2022-09-13
- Earliest claimed: 2018-01-12
- Assignees: Mitsubishi Heavy Industries Engineering, Ltd.
- Applicants: Mitsubishi Heavy Industries Engineering, Ltd.
- Inventors: Katsumi Nochi; Masanao Yonemura; Toshinobu Yasutake; Kaori Yoshida
- Web page: https://patentgrep.com/patent/US11439981B2

## CPC

- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 23/04: Alkali metals
- B01J 27/02: Sulfur, selenium or tellurium; Compounds thereof
- B01J 27/053: Sulfates
- B01J 37/0009: {Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst}
- B01J 37/0018: {Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)}
- B01J 37/0201: {Impregnation}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- C10K 1/004: {Sulfur containing contaminants, e.g. hydrogen sulfide}
- C10K 1/34: by catalytic conversion of impurities to more readily removable materials
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C10K: PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE

## Abstract

A catalyst for COS hydrolysis includes titanium dioxide and a barium compound supported on the titanium dioxide. The catalyst, when expressing Ba and S in the catalyst in terms of BaO and SO3, respectively, has a molar ratio of SO3 to BaO of at least 1. The catalyst converts COS and H2O in a raw material gas to CO2 and H2S.

## Claims

### Claim 1

A catalyst for COS hydrolysis comprising:
a titanium dioxide carrier;
a barium compound supported on the titanium dioxide carrier; and
sulfate ions supported on the titanium dioxide carrier;
wherein, a Ba content and a S content in the catalyst are expressed in terms of BaO and SO3, respectively, and a molar ratio of SO3 to BaO in compounds supported on the titanium dioxide carrier of the catalyst is at least 2.1, and
wherein the catalyst converts COS and H2O in a raw material gas to CO2 and H2S.

### Claim 2 (depends on 1)

The catalyst for COS hydrolysis according to claim 1, wherein the barium compound is supported on the titanium dioxide carrier in an amount of 2% by mass or greater and 8% by mass or less in terms of the barium oxide with respect to the catalyst.

### Claim 3

A method of producing a catalyst for converting COS and H2O in a raw material gas to CO2 and H2S by COS hydrolysis, comprising:
adding a barium acetate solution to titanium dioxide containing a sulfate ion and performing kneading to obtain a kneaded product;
extruding the kneaded product to obtain a molded catalyst;
drying the molded catalyst; and
calcining subsequent to the drying to obtain a catalyst of a titanium dioxide carrier supporting a barium compound and a sulfate ion,
wherein, a Ba content and a S content in the catalyst are expressed in terms of BaO and SO3, respectively, and a molar ratio of SO3 to BaO in compounds supported on the titanium dioxide carrier of the catalyst is at least 2.1.

### Claim 4 (depends on 3)

The method according to claim 3, wherein in the kneading to obtain the kneaded product, the barium acetate solution is added in an amount of 2% by mass or more and 8% by mass or less in terms of the barium oxide with respect to the catalyst.