M. Keane
Apr 25, 1997
Citations
0
Influential Citations
42
Citations
Journal
Journal of Molecular Catalysis A-chemical
Abstract
Abstract The gas phase hydrogen treatment of benzaldehyde and o -tolualdehyde was studied over a Ni/SiO 2 catalyst prepared by homogeneous precipitation/deposition. The reactions were conducted in the absence of diffusion limitations and reproducible turnover frequencies are presented. The products generated resulted from the hydrogenation and hydrogenolysis of the substituent CO bond and from the hydrogenolysis of the aryl-carbonyl CC bond, the aromatic ring remaining intact. The temperature dependencies of the rate constant and product selectivity are illustrated and apparent activation energies for hydrogenation to the aromatic alcohol are given. The influence of the ortho -substituted methyl group on the reactivity of the carbonyl function is discussed. The reaction of benzyl alcohol and 2-methylbenzyl alcohol over the same catalyst was investigated and the overall reaction pathway is identified.