A surfactant-assisted preparation of well dispersed rhodium nanoparticles within the mesopores of A1SBA-15: characterization and use in catalysisf

摘要

Well dispersed and efficient Rh(0) hydrogenation catalysts were obtained by the reduction of Rh(m)-exchanged mesoporous aluminosilicates by sodium borohydride in the presence of N,N-dimethyl-N-cetyl-N-(2-hydroxyethyl) ammonium chloride.rnControlled nanometre-sized metal species have attracted great attention in the field of catalysis because of their unique chemical and physical properties. Particles hosted in porous supports are mainly prepared by the decomposition of organo-metallic compounds or the reduction of metallic salts. In the latter case, impregnation methods are limited by the tendency of the metal to agglomerate on the external surface. In parallel, the control of the size of metallic particles by the use of protective agents in solution is now well established. Among noble metal nanoparticles, dispersions of rhodium(0) colloids are known to be efficient hydrogenation catalysts. Up to now, most of the methods used for the heterogenization of Rh(0) colloids consist in the impregnation of solids like polymers, silica and alumina.