Au/Fe2O3 catalyst materials, method for the production thereof and their use
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United States of America Patent
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Apr 13, 2004
Grant Date -
N/A
app pub date -
Feb 8, 2001
filing date -
Aug 12, 1998
priority date (Note) -
Expired
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Abstract
The invention relates to an Au/Fe.sub.2 O.sub.3 catalyst comprised of a particle-shaped, co-catalytically active Fe.sub.2 O.sub.3 supporting material with metallic Au clusters deposited thereupon which have a diameter of less than 4.5 nm. The catalyst materials can be obtained by: a) reacting a water-soluble Fe(III) salt in an aqueous medium with a base; b) impregnating the hydroxide gel which is formed thereby and which is still moist with a solution of a water-soluble Au compound in order to deposit complexed Au clusters on the surface of the hydroxide gel; c) removing water from the suspension of the reaction product formed thereby; d) subjecting the dried reaction product to a calcination at temperatures ranging from 350 and 700.degree. C. The inventive catalyst material is especially suited for selective low-temperature CO oxidation in reformate hydrogen which is used as combustible gas for polymer electrolyte membrane (PEM) fuel cells.
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