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Effect of particle size on the chemisorption and decomposition of carbon monoxide by palladium and nickel clustersThe chemisorption of gases on well-defined, supported metal particles is a model for basic processes in heterogeneous catalysis. In this study, the chemisorption and decomposition of carbon monoxide on palladium and nickel particles was examined as a function of particle size. Particulate films with average particle sizes ranging from 1 to 10 nm were grown by vapor deposition on UHV-cleaved mica. Successive CO adsorption-desorption cycles resulted in the accumulation of carbon on the particles, which suppressed CO adsorption. The rate of carbon accumulation was strongly dependent on particle size and was higher for Ni than for Pd over the same size range. Carbon was removed from both metals by oxygen treatments at elevated temperatures. However, a mixture of CO and O2 was effective for monitoring the removal of carbon from palladium.
Document ID
19810063491
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Doering, D. L.
(NASA Ames Research Center Moffett Field, CA, United States)
Poppa, H.
(NASA Ames Research Center; Stanford Joint Institute for Surface and Microstructure Research Moffett Field, CA, United States)
Dickinson, J. T.
(Washington State University Pullman, WA, United States)
Date Acquired
August 11, 2013
Publication Date
March 1, 1981
Publication Information
Publication: Journal of Vacuum Science and Technology
Volume: 18
Subject Category
Inorganic And Physical Chemistry
Accession Number
81A47895
Funding Number(s)
CONTRACT_GRANT: NCA2-OR-840-801
Distribution Limits
Public
Copyright
Other

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