Catalysts for water gas shift reaction, method for removing carbon monoxide in hydrogen gas and fuel cell generation system

a technology of water gas shift and catalyst, which is applied in the direction of physical/chemical process catalysts, combustible gas catalytic treatment, bulk chemical production, etc., can solve the problem of difficulty in applying cu—zn based catalyst to the fuel cell generation system, and achieve the effect of reducing the concentration of carbon monoxide in the gas

Inactive Publication Date: 2005-02-10
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The present invention has been made considering the problem as described above, and an object of the present invention is to provide a catalyst for a water gas shift reaction which can removes CO effectively in a hydrogen gas preferably within a broader temperature range and which can be used for the removal of CO contained in the hydrogen gas. Such catalyst can be used as a catalyst which accelerates a water gas shift reaction when CO is removed from a gas rich in hydrogen which is formed particularly in a fuel cell generation system.
[0026] In this method, the hydrogen gas which contains carbon monoxide is contacted with the catalyst for the water gas shift reaction which is retained by a proper means or manner at a temperature between 200° C. and 400° C. and preferably a temperature between 220° C. and 350° C. in the presence of steam. The steam may be supplied in any suitable manner. The hydrogen gas which is used in this method is not particularly limited as far as it contains carbon monoxide. For example, the method according to the present invention is preferably applied to a reformed gas which contains hydrogen as a main component, and also contains carbon monoxide and steam so that a concentration of carbon monoxide contained in the gas is reduced.

Problems solved by technology

Therefore, it is difficult to apply the Cu—Zn based catalyst to a fuel cell generation system wherein start and stop are repeatedly carried out, and in particular to a compact fuel cell generation system.

Method used

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  • Catalysts for water gas shift reaction, method for removing carbon monoxide in hydrogen gas and fuel cell generation system
  • Catalysts for water gas shift reaction, method for removing carbon monoxide in hydrogen gas and fuel cell generation system
  • Catalysts for water gas shift reaction, method for removing carbon monoxide in hydrogen gas and fuel cell generation system

Examples

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examples

[0055] The present invention will be concretely explained with reference to examples.

examples 1 to 5

[0056] Using a firing furnace, n-hydrate of zirconium hydroxide (ZrO2.H2O, manufactured by Mitsuwa Chemicals Co. Ltd.) was subjected to a firing treatment wherein it was heated to a temperature of 500° C. in one hour in an air flow of 60 ml / min., and kept at that temperature for one hour, and thereby zirconium oxide was obtained as a zirconia carrier.

[0057] A predetermined amount of the obtained zirconia carrier was charged into an evaporating dish located above a water bath. Pure water was added to the carrier and they are mixed intimately. An aqueous solution of chloroplatinic acid hexahydrate (manufactured by NACALAI TESQE INC.) was added to the evaporating dish, and pure water was further added to reach a predetermined concentration. The dish was located above the water bath while stirring so that the evaporation to dryness of the contents in the dish was carried out, during which a metal salt depositing on a wall of the evaporating dish was washed away with pure water into the...

example 6

[0068] A predetermined amount of the zirconia carrier which was prepared in Examples 1 to 5 was charged into an evaporating dish located above a water bath. Pure water was added to the carrier and they are mixed intimately. An aqueous solution of chloroplatinic acid hexahydrate (manufactured by NACALAI TESQE INC.) and an aqueous solution of lanthanum nitrate hexahydrate (manufactured by Wako Pure Chemicals Industries, Ltd.) were added to the evaporating dish, and pure water was further added to reach predetermined concentrations. The dish was located above the water bath while stirring so that the evaporation to dryness of the contents in the dish was carried out, during which metal salts depositing on a wall of the evaporating dish were washed away with pure water into the bottom of the dish. Such depositing salts arose with proceeding of the water evaporation. The evaporation to dryness took one hour.

[0069] The obtained material through the evaporation to dryness was further drie...

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Abstract

There is provided a catalyst for a water gas shift reaction in a hydrogen gas which is able to effectively remove CO in the hydrogen gas within a broader temperature range. Such a catalyst for the water gas shift reaction is characterized in that a metal oxide carrier supports at least platinum. The catalyst can be used for removing carbon monoxide in the hydrogen gas. Particularly, such a catalyst can be used in the water gas shift reaction for removing carbon monoxide in a reformed gas in a fuel cell generation system.

Description

TECHNICAL FIELD [0001] The present invention relates to a water-gas-shift-reaction catalyst used for converting and removing carbon monoxide (CO) in a gas which is rich in hydrogen through a water gas shift reaction, a method for removing carbon monoxide in a hydrogen gas using such catalyst, and a fuel cell generation system using such catalyst. BACKGROUND ART [0002] A reformed gas which is rich in hydrogen is produced by a steam reforming reaction of a hydrocarbon gas, liquid or solid, or a fuel such as methanol or the like with steam, and such reformed gas contains carbon monoxide as a by-product. The reformed gas is used for a supply of hydrogen as a fuel in a fuel cell electricity generation system. [0003] It is contemplated that among fuel cells, a polymer electrolyte fuel cell (or solid polymer fuel cell) is used for a vehicle, a compact generator and a domestic co-generation system since it operates at a lower temperature, produces a higher power density, and is expected to ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J21/06B01J23/42B01J23/54B01J23/58B01J23/63B01J23/652B01J23/656C01B3/16C01B3/48C10K3/04H01M8/06
CPCB01J21/06Y02E60/50B01J21/066B01J23/42B01J23/54B01J23/58B01J23/63B01J23/652B01J23/6567C01B3/16C01B3/48C01B2203/0283C01B2203/066C01B2203/1041C01B2203/107C01B2203/1082C10K3/04H01M8/06H01M8/0662B01J21/063Y02P20/52
Inventor IGARASHIHIGASHI, HIROKAZUMIZOBUCHI, MANABUHASHIMOTO, NOBORUKINUGAWA, KENSAKU
Owner MATSUSHITA ELECTRIC WORKS LTD
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