The effect of pressure on the catalytic hydrogenation of aromatic hydrocarbons on rhodium.

Citation:

Samuel Siegel and Nissim. Garti. 1977. “The effect of pressure on the catalytic hydrogenation of aromatic hydrocarbons on rhodium.” In Catal. Org. Synth., [Conf.], 6th, Pp. 9–23. Academic.

Abstract:

Hydrogenation of 1,4- (I) and 1,3-di-tert-butylbenzene (II), p-xylene (III), and m-xylene (IV) over a Rh/Al2O3 catalyst at 0.34-150 atm H pressure was examd. With I, the rate of hydrogenation, the amt. of intermediate cyclohexene formed, and the cis-trans ratio of final product all increased, then decreased, with increasing pressure, but with II the rate and amt. of intermediate increased, while the product cis-trans ratio decreased, with increasing pressure. Hydrogenation of III paralleled that of I, except that the cis-trans ratio of dimethylcyclohexane steadily increased with increasing pressure; the same pressure effect on product isomer distribution was obtained with IV, but with IV the rate of hydrogenation increased with pressure throughout the obsd. range. The results are discussed in terms of possible types of reactive sites and their interconversion. [on SciFinder(R)]
Last updated on 06/28/2020