Catalyst for the synthesis of methyl mercaptan and process for producing methyl mercaptan from synthesis gas and hydrogen sulphide

Patent metadata

Field	Value
Publication number	US-10377704-B2
Application number	US-201815910151-A
Country	US
Kind code	B2
Filing date	Mar 2, 2018
Priority date	Mar 29, 2013
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

The invention relates to a catalyst comprising an active component based on molybdenum and on potassium and a support based on hydroxyapatite, and also to a process for preparing said catalyst and a process for producing methyl mercaptan in a catalytic process by reaction of carbon monoxide, sulphur and/or hydrogen sulphide and hydrogen, comprising the use of said catalyst.

First claim

The invention claimed is:

1. A catalyst comprising a molybdenum- and potassium-based active component and a hydroxyapatite-based support.

2. The catalyst of claim 1 , wherein the catalyst support is hydroxyapatite having stoichiometric formula Ca 10 (PO 4 ) 6 (OH) 2 .

3. The catalyst of claim 2 , wherein the molybdenum- and potassium-based active component is selected from the group consisting of compounds based on Mo—S—K, compounds based on Mo—O—K, and mixtures thereof.

4. The catalyst of claim 3 , wherein the molybdenum- and potassium-based active component is obtained from a precursor having the formula K 2 MOS 4 .

5. The catalyst of claim 4 , wherein the weight ratio of K 2 MoS 4 and Ca 10 (PO 4 ) 6 (OH) 2 used to obtain the catalyst is
K 2 MoS 4 /Ca 10 (PO 4 ) 6 (OH) 2 =31.3/100.

6. The catalyst of claim 3 , wherein the molybdenum- and potassium-based active component is obtained from a precursor having structure K 2 MoO 4 .

7. The catalyst of claim 6 , wherein the weight ratio of K 2 MoO 4 and Ca 10 (PO 4 ) 6 (OH) 2 used to obtain the catalyst is:
K 2 MoO 4 /Ca 10 (PO 4 ) 6 (OH) 2 =50.7/100.

8. The catalyst of claim 1 , wherein the hydroxyapatite of the hydroxyapatite-based support has a Ca/P molar ratio ranging from 1.5 to 2.1.

9. The catalyst of claim 1 , wherein the hydroxyapatite of the hydroxyapatite-based support has a Ca/P molar ratio of 1.67.

10. The catalyst of claim 1 , wherein the hydroxyapatite-based support has a specific area greater than 25 m 2 /g.

11. The catalyst of claim 1 , wherein the hydroxyapatite-based support has a specific area greater than 40 m 2 /g.

12. The catalyst of claim 1 , wherein the hydroxyapatite is a stoichiometric hydroxyapatite.

13. The catalyst of claim 1 , wherein the catalyst does not include a promoter.

14. The catalyst of claim 1 , wherein the catalyst further comprises a promoter.

15. The catalyst of claim 14 , wherein the promoter comprises at least one of tellurium oxide, nickel oxide or iron oxide.

16. The catalyst of claim 1 , wherein the hydroxyapatite-based support has a specific area of 40 m 2 /g to 300 m 2 /g.

17. The catalyst of claim 1 , wherein the hydroxyapatite-based support has a specific area of 40 m 2 /g to 300 m 2 /g and a Ca/P molar ratio of 1.67.

18. A process for preparing the catalyst of claim 1 , comprising:
preparing a precursor for the molybdenum- and potassium-based active component;
preparing the hydroxyapatite-based support; and
dry impregnating the hydroxyapatite-based support with the precursor for the molybdenum- and potassium-based active component.

Assignees

• Arkema France

Inventors

• Fremy Georges
• Barre Patrice
• Sanchou Karine
• Cordova Alexia
• Lamonier Carole
• Blanchard Pascal

Classifications

• B01J23/755

  Nickel · CPC title

• C07C319/06

  from sulfides, hydropolysulfides or polysulfides · CPC title

• C07C319/02 Primary

  of thiols · CPC title

• B01J23/28

  Molybdenum · CPC title

• B01J27/0576

  Tellurium; Compounds thereof · CPC title