Effect of adsorption geometry on the selectivity of carbonyl group hydrogenation on Pd/SiO2

Ching Shiun Chen, Hsiu Wei Chen*

*此作品的通信作者

研究成果: 期刊稿件文章同行評審

12 引文 斯高帕斯(Scopus)

摘要

The gas-phase acetophenone hydrogenation reaction on Pd/SiO2 catalysts has been modelled to reveal the relationship between the adsorption geometry and the selectivity of carbonyl group hydrogenation. The mechanism of the adsorption configuration effect on the hydrogenation selectivity is discussed. The key to the hydrogenation selectivity of a ketone is related to the bonding geometry of the carbonyl group. This has been demonstrated via product yield, temperature effects, hydrogen-concentration effects, presorbed-oxygen effects and infrared spectroscopy. The η1-carbonyl ('end-on' coordination) can be hydrogenated to a hydroxy group, or be hydrogenated directly to a methylene group. The latter process can be enhanced by electron-withdrawing promoters. The η2-carbonyl ('side-on' coordination) tends to be hydrogenated to a hydroxy group that can be further reduced to a methylene group via a consecutive reaction pathway.

原文英語
頁(從 - 到)1595-1601
頁數7
期刊Journal of the Chemical Society - Faraday Transactions
92
發行號9
DOIs
出版狀態已出版 - 07 05 1996
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