Issue 9, 1996

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

Abstract

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.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1996,92, 1595-1601

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

C. Chen and H. Chen, J. Chem. Soc., Faraday Trans., 1996, 92, 1595 DOI: 10.1039/FT9969201595

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements