Low temperature sulfur tolerant tar and sulfur removal with concomitant synthesis gas conditioning

Patent metadata

Field	Value
Publication number	US-9486782-B2
Application number	US-201414579415-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Sep 13, 2010
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A catalyst comprising of NiO; Al 2 O 3 ; and ZnO. The catalyst is capable of greater than 5% sulfur removal from a synthesis gas at a temperature range from 300° C. to 600° C.

First claim

The invention claimed is:

1. A catalyst for treating a raw synthesis gas comprising:
(a) 7.5 to 12.5 wt. % NiO;
(b) Al 2 O 3 ; and
(c) 7.5 to 12.5 wt % ZnO,
wherein the catalyst is simultaneously capable of greater than 5% sulfur removal and 20% to 60% tar removal from a synthesis gas containing tar and sulfur-containing compounds at a temperature in a range from 300° C. to 600° C.

2. The catalyst of claim 1 , wherein the catalyst is capable of greater than 55% tar conversion at 350° C.

3. The catalyst of claim 1 , wherein NiO is present from 7.5 to 10 wt %.

4. The catalyst of claim 1 , wherein the catalyst is capable of sulfur removal from the synthesis gas at greater than 10%.

5. The catalyst of claim 1 , wherein the catalyst is configured to be used in a circulating fluidized bed reactor.

6. The catalyst of claim 1 , wherein at least one of Ni and Zn are present as both reduced metal sites and metal oxide sites.

7. The catalyst of claim 6 , wherein the reduced metal sites comprise the hydride form of the metal.

8. A catalyst comprising of:
(a) 7.5 to 12.5 wt % NiO;
(b) Al 2 O 3 ; and
(c) 7.5 to 12.5 wt % ZnO,
wherein the catalyst is capable of greater than 20% sulfur removal from a synthesis gas while simultaneously removing 20% to 60% of tar from the synthesis gas at a temperature range from 350° C. to 550° C. and a pressure range from 14.7 to 1,200 psig.

9. The catalyst of claim 8 , wherein the catalyst is configured to be used in a circulating fluidized bed reactor.

10. The catalyst of claim 8 , wherein at least one of Ni and Zn are present as both reduced metal sites and metal oxide sites.

11. The catalyst of claim 10 , wherein the reduced metal sites comprise the hydride form of the metal.

12. A catalyst for treating a raw synthesis gas, the catalyst comprising:
(a) a mixture of nickel oxide and nickel hydride;
(b) a mixture of zinc oxide and zinc hydride; and
(c) Al 2 O 3 ;
wherein the catalyst comprised nickel oxide in an amount in a range from 7.5 to 12.5 wt % and zinc oxide in an amount in a range from 7.5 to 12.5 wt % prior to reducing a portion of the nickel oxide and zinc oxide with hydrogen.

13. The catalyst of claim 12 , wherein, at a temperature in a range from 300° C. to 600° C., the catalyst is simultaneously capable of sulfur removal and tar removal from a raw synthesis gas containing tar and sulfur-containing compounds.

Assignees

• Lummus Technology Inc

Inventors

• Pansare Sourabh S
• Allison Joe D
• Lusk Steven E
• Tsang Albert C

Classifications

• C01B2203/045

  Purification by catalytic desulfurisation · CPC title

• B01J23/80 Primary

  with zinc, cadmium or mercury · CPC title

• C01B3/58

  including a catalytic reaction · CPC title

• C01B2203/0435

  Catalytic purification · CPC title

• C10K1/004

  Sulfur containing contaminants, e.g. hydrogen sulfide · CPC title