Partial hydrogenation of benzene on Ru catalysts: Effects of additives in the reaction medium

Authors:  Raphael Soeiro Suppino, Richard Landers, Antonio José Gomez Cobo

Abstract:
The partial hydrogenation of benzene is an interesting chemical reaction mostly because of cyclohexene, a compound that can be part of the production chain of many other chemicals. In the present work, it was investigated the effects of additives in the reaction medium on the performance of Ru/Al2O3 and Ru/CeO2 catalysts for the partial hydrogenation of benzene in liquid phase. The Ru catalysts were prepared by incipient impregnation or wet impregnation, both from aqueous solution of the precursor RuCl3·xH2O. The catalysts prepared by incipient impregnation were reduced at 573K under H2 flow, whereas formaldehyde was used to reduce the catalysts prepared by wet impregnation. The solids were characterized by potentiometric titration, N2 physisorption, SEM, TEM, EDX, XPS and TPR. The catalytic performance in the liquid phase was evaluated using a slurry Parr reactor at 373K and under 5 MPa of H2 pressure. The additives studied were the following: ethylenediamine, ethyl acetate, n-methyl-2- pyrrolidone, monoethyleneglycol and monoethanolamine. The results indicate thatthe Ru/Al2O3 catalyst, prepared by wet impregnation, leads to the highest values of activity and selectivity. The yield of cyclohexene follows the order: monoethanolamine > monoethyleneglycol > n-methyl-2-pyrrolidone ethyl acetate > without additive ethylenediamine.

Keywords:
Benzene hydrogenation
Ruthenium catalyst
Cyclohexene
Additive

Published in: Applied catalysis A: General  (Volume 452, Pages 1-222, 15 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Partial hydrogenation of benzene on Ru catalysts: Effects of additives in the reaction medium

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