Journal
APPLIED CATALYSIS A-GENERAL
Volume 396, Issue 1-2, Pages 1-7Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2010.12.030
Keywords
Supported palladium catalysts; Sintering; Stabilization; Chemical vapour deposition (CVD); Chemical vapour synthesis (CVS)
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Funding
- Ministry of Science, Research and the Arts of Baden-Wurttemberg [Az. 33-729.61-3]
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1119]
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The influence of an HfOx coating on the initial sintering rates of nearly monodisperse Pd model catalyst particles on silica was measured at well defined temperatures and residence times in the gas-phase. It was found that minute amounts of HfOx significantly retard the sintering of the Pd and at higher amounts the mean Pd size can even be maintained. Analysis of the Pd size distributions indicates an immobilization of the Pd particles and a growth by Ostwald ripening. The coated catalysts were extremely stable at reaction conditions and show only a negligible loss of activity in the hydrogenation of ethylene. (C) 2011 Elsevier B.V. All rights reserved.
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