期刊
CHEMICAL ENGINEERING SCIENCE
卷 57, 期 13, 页码 2519-2529出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0009-2509(02)00134-3
关键词
platinum; hydrogenation; crotonaldehyde; Pt/SnO2; deactivation; two-site model
Hydrogenation of crotonaldehyde was studied in the gas phase, at atmospheric pressure and 353 K over 5% Pt/SnO2 catalysts, prepared from Pt(NH3)(4)(NO3)(2) and H2PtCl6. Rapid deactivation during time on stream was observed. Experiments were performed consecutively in a series using a catalyst reduction pretreatment between kinetic runs. Selectivity was found to be dependent on ageing period and on the metal precursor. Selectivity as high as 70% until 40% conversion was observed using Pt(NH3)(4)(NO3)(2) as precursor. Adsorption and hydrogenation of the C=O and C=C groups are supposed to occur on different sites, which have different deactivation properties. Kinetic model is advanced to describe deactivation and selectivity patterns. (C) 2002 Published by Elsevier Science Ltd.
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