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

Paper ID Volume ID Publish Year Pages File Format Full-Text
40486 45856 2013 8 PDF Available
Title
Partial hydrogenation of benzene on Ru catalysts: Effects of additives in the reaction medium
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 573 K 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 373 K 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 that the 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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (115 K)Download as PowerPoint slideHighlights► Impregnation methods induce remarkable effects on Ru/Al2O3 catalytic performance. ► Formaldehyde is a fine reduction agent for wet-impregnated catalysts. ► Ru/Al2O3 leads to higher cyclohexene yields compared to Ru/CeO2. ► Presence of amines or alcohols in the reaction medium increases cyclohexene yield.

Keywords
Benzene hydrogenation; Ruthenium catalyst; Cyclohexene; Additive
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 452, 15 February 2013, Pages 9–16
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us