Chemistry: electrical current producing apparatus – product – and – Having earth feature
Patent
1997-08-15
1999-06-29
Bell, Bruce F.
Chemistry: electrical current producing apparatus, product, and
Having earth feature
429 40, 204293, 502101, 502185, 252500, 252502, 252503, H01M 486
Patent
active
059167025
ABSTRACT:
The invention is a composition, comprising: a carbon-supported, dispersed platinum-zinc alloy having the formula Pt-Zn.sub.x /C wherein x ranges from greater than 0.05 to less than 1 wherein platinum is in the form of platinum particles ranging in size from about 20 .ANG. to about 30 .ANG. on a carbon support, wherein the carbon is in the form of high surface area carbon having surface area ranging from about 100 to about 500 m.sup.2 /g, and the platinum particles are present in an amount ranging from about 10 to about 40 wt % on the carbon support. The composition is made by the process of depositing on the carbon support a soluble zinc source selected from the group of zinc nitrate, acetate, halides, formates, oxalates, and acetyl acetonates and mixtures thereof; calcining to convert the zinc source to ZnO; and then reducing the zinc oxide at a temperature ranging from about 250.degree. C. to about 600.degree. C., in the presence of hydrogen at a pressure ranging from about 1 atmosphere (100 KPa) to about 10 atmospheres(1000 KPa). or by the process of admixing zinc powder with Pt/C powder; and heating the mixture under a reducing atmosphere at a temperature sufficient to produce the Pt-Zn.sub.x /C alloy, wherein x ranges from greater than 0.05 to less than 1. The invention has utility in fuel cells in electrochemical processes requiring CO tolerant anodes.
REFERENCES:
patent: 5346871 (1994-09-01), Robbins et al.
patent: 5374598 (1994-12-01), Stonehart et al.
patent: 5470673 (1995-11-01), Tseung et al.
Appleby and Foulkes, The Fuel Cell Handbook, Chapter 11, "Anodic Electrocatalysis", pp. 313-748. No Date Available.
Bellows Richard James
Buckley David Terence
Marucchi-Soos Elise
Robbins John Lawrence
Bell Bruce F.
Exxon Research and Engineering Co.
Scuorzo Linda M.
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