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Catalysts for initiating the hydrogen-oxygen reaction at 78 K.Catalysts for initiating reaction of hydrogen with oxygen in gas mixtures at temperatures down to 78 K (-195 C) were sought. A rising-temperature reactor was used for detecting onset of reaction. The platinum metals, especially iridium, platinum, and ruthenium, were the most active. With high concentrations of iridium on an alumina support, reaction initiation was observed at -195 C for a helium stream containing 3% hydrogen and 1% oxygen. Best results were obtained when the catalyst had been preheated in hydrogen and cooled in a hydrogen environment before being contacted with oxygen-containing gas. The initiation is interpreted to be the result of transient phenomena which occur when a hydrogen-oxygen mixture contacts an active catalyst. Chemisorption of oxygen and formation of some water, along with water adsorption on the support, serve to raise the temperature to a point where true catalysis can proceed.
Document ID
19720048884
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jennings, T. J.
Voge, H. H.
Armstrong, W. E.
(Shell Development Co. Emeryville, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
March 1, 1972
Publication Information
Publication: Journal of Catalysis
Volume: 24
Subject Category
Chemistry
Accession Number
72A32550
Funding Number(s)
CONTRACT_GRANT: NAS7-387
Distribution Limits
Public
Copyright
Other

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