期刊
CATALYSIS TODAY
卷 116, 期 1, 页码 22-29出版社
ELSEVIER
DOI: 10.1016/j.cattod.2006.04.002
关键词
hydrogenation; 1-pentene; selectivity; palladium; alkenes; competitive reactions
资金
- Engineering and Physical Sciences Research Council [GR/R50899/01] Funding Source: researchfish
The hydrogenation of 1-pentene, cis-2-pentene and trans-2-pentene was studied over a 1% Pd/alumina catalyst. The rate of hydrogenation was cis-2-pentene > 1-pentene > trans-2-pentene. As the system moved towards thermodynamic equilibrium in pentene isomers the rate constant changed to that of the trans-isomer in a competitive environment. In competitive hydrogenation between the alkenes the hydrogenation rate of I pentene and trans-2-pentene are enhanced while that of cis-2-pentene is decreased. In a competitive system between alkene and alkyne, the rate of 1-pentene hydrogenation is increased 20-fold, even after all the pentyne is reacted. Enhanced hydrogen transfer through a modified hydro-carbonaceous deposit is believed to be the cause. The results also support the concept of separate sites for alkyne and alkene in a competitive environment. (c) 2006 Elsevier B.V. All rights reserved.
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