Partial hydrogenenation of benzene in liquid phase : influence of nature and morphology of supports alumina and niobia in ruthenium catalysts performance / Hidrogenação parcial do benzeno em fase liquida : influencia da natureza e da morfologia dos suportes alumina e niobia no desempenho de catalisadores de rutenio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The principal aim of the present work is to study the effects of the morphology of supports, especially the particle diameter and the specific area on the performance of catalytic Ru/Al2O3 and Ru/Nb2O5 for partial hydrogenation reaction of benzene in liquid phase. Therefore, Ru/Al2O3 and Ru/Nb2O5 catalysts were prepared by incipient wetness impregnation, from an aqueous solution of RuCl3.xH2O chlorinated precursor, using supports with several granulometries and specific areas. After impregnation, the solids were dried at 358 K, for a period of 24 h. Then the solid underwent a treatment to direct reduce under H2, at the temperature of 573 K. The solid results were characterized by technical Mastersizer-Particle size Analysis, Diffraction of X-rays, adsorption of N2 (BET method), Electronic Scanning Microscopy and Temperature Programmed Reduction (TPR). The performances were evaluated in the catalytic reaction of benzene hydrogenation, using a reactor Parr of the "slurry". The reaction was conducted under constant pressure of 5.0 MPa of H2 and a temperature of 373 K, in a three-phase reactional medium with water. For the conditions employed in this study, the results show that virtually no influence the nature of the Al2O3 and Nb2O5 supports on the ciclohexene selectivity. However, the increase in the diameter of particle or the specific area of support decreases the yield of the desired product

ASSUNTO(S)

cicloexeno benzene alumina cicloexeno ruthenium rutenio alumina benzeno

ACESSO AO ARTIGO

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