Issue 2, 2013

Heterogeneous cobalt catalysts for the acceptorless dehydrogenation of alcohols

Abstract

A series of transition metal(M)-loaded TiO2 catalysts (M/TiO2) and Co-loaded catalysts on various support materials were prepared by an impregnation method, followed by in situ H2-reduction at 400 °C, and tested for the acceptor-free oxidation of cyclododecanol in the liquid phase. Among the catalysts including noble metal catalysts, Co/TiO2 showed the highest activity. In the presence of Co/TiO2 (0.1–3 mol%) the dehydrogenation of various aliphatic secondary alcohols proceeded to afford the corresponding ketones. The catalyst was recoverable and was reused after the H2-reduction treatment. Based on the spectroscopic characterization of the catalyst combined with the studies on the effect of the Co oxidation states on the catalytic activity, it is clarified that the surface metallic Co sites with electron deficiency are the catalytically active species.

Graphical abstract: Heterogeneous cobalt catalysts for the acceptorless dehydrogenation of alcohols

Supplementary files

Article information

Article type
Paper
Submitted
02 Oct 2012
Accepted
29 Nov 2012
First published
03 Dec 2012

Green Chem., 2013,15, 418-424

Heterogeneous cobalt catalysts for the acceptorless dehydrogenation of alcohols

K. Shimizu, K. Kon, M. Seto, K. Shimura, H. Yamazaki and J. N. Kondo, Green Chem., 2013, 15, 418 DOI: 10.1039/C2GC36555C

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