Abstract
Effect of added Fe, Co, Ni on Rh–toluene interaction for alumina-supported rhodium catalysts. A series of catalysts Rh–M/Al 2O 3 (M = Fe, Co, Ni, Pb) was prepared by solution-impregnation method. The catalysts modified by Fe, Co, Ni were studied by thermal programmed desorption (TPD) of toluene, then tested in hydrogenation reaction of toluene between 25 and 250 °C. The effect of lead, which is known as a poison of catalyst, was also studied. The results of toluene TPD show a decrease of Rh–toluene interaction strengths in the presence of Fe, Co and Ni, which are represented by a significant increase of the fraction of toluene desorbing molecularly from the rhodium surface. Consequently, these catalysts, modified by Fe, Co and Ni, give a best catalytic activity and stability. However, the lead affects noticeably the activity and stability of Rh/Al 2O 3 catalyst. To cite this article: F. Benseradj et al., C. R. Chimie 7 (2004) .
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