Char methanation catalyst and its use in gasification processes
First Claim
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1. A process for the production of a methane-enriched gaseous product, comprising the steps of:
- (a) gasifying a carbonaceous material in a gasifying reactor, in the presence of steam and an alkali metal gasification catalyst, to produce a gaseous product stream and an alkali metal-containing solid char product, wherein the gaseous product stream comprises methane, carbon monoxide, carbon dioxide and hydrogen;
(b) withdrawing the alkali metal-containing solid char product from the gasifying reactor;
(c) introducing a gaseous mixture comprising hydrogen and carbon monoxide into a reaction zone containing at least a portion of the alkali metal-containing solid char product as a methanation catalyst,(d) reacting at least a portion of the hydrogen with at least a portion of the carbon monoxide in the reaction zone, under suitable temperature and pressure, in the presence of the alkali metal-containing solid char product to produce a methane-enriched gaseous product, and(e) recovering a methane-enriched gaseous product from the reaction zone.
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Abstract
The invention provides processes for generating a methane-enriched gas from a gas mixture comprising carbon monoxide and hydrogen such as gas streams generated by gasification of an alkali metal catalyst-loaded carbonaceous feedstock, and a char methanation catalyst useful in such processes.
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10 Claims
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1. A process for the production of a methane-enriched gaseous product, comprising the steps of:
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(a) gasifying a carbonaceous material in a gasifying reactor, in the presence of steam and an alkali metal gasification catalyst, to produce a gaseous product stream and an alkali metal-containing solid char product, wherein the gaseous product stream comprises methane, carbon monoxide, carbon dioxide and hydrogen; (b) withdrawing the alkali metal-containing solid char product from the gasifying reactor; (c) introducing a gaseous mixture comprising hydrogen and carbon monoxide into a reaction zone containing at least a portion of the alkali metal-containing solid char product as a methanation catalyst, (d) reacting at least a portion of the hydrogen with at least a portion of the carbon monoxide in the reaction zone, under suitable temperature and pressure, in the presence of the alkali metal-containing solid char product to produce a methane-enriched gaseous product, and (e) recovering a methane-enriched gaseous product from the reaction zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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