Preparation of porous ruthenium catalysts utilizing a silsesquioxane ligand;catalytic activity towards hydroformylation of 1-octene

摘要

The controlled calcination of ruthenium complexes together with an aminosilsesquioxane ligand(1)at 823 K in air stream for 4 h afforded porous silicas including monodispersed ruthenium oxide nanoparticles with high surface areas and uniformly controlled micropores.Bimodal porous oxides with both meso-and micropores were prepared by the impregnation of Ru complexes and 1 onto titania(JRC-TIO-4)or silica(JRC-SIO-1),followed by the careful calcination at 823 K.These bimodal catalysts showed higher activity towards hydroformylation of 1-octene(C9-aldehydes yield up to 31%,linear selectivity up to 95% in CO 20 atm,H2 25 atm at 403 K for 20 h with 1,5 mol% Ru catalyst)than the catalysts prepared without an aminosilsesquioxane ligand.