METHOD FOR PREPARING ALKYL HYDROGENO HALOSILANES (AHHS) BY CATALYTIC HYDROGENATION

摘要

The invention concerns the upgrading of a by-product of direct synthesis, namely MeSiCl3 by vapour phase catalytic hydrogenation of said by-product to obtain MeHSiCl2 with greater added value. The invention concerns a method for preparing MeHSiCl2 by catalytic hydrogenation of MeSiCl3 in the presence of a metal catalyst, with high selectivity levels in MeHSiCl2 economically and without having recourse to drastic and industrially unsuitable conditions. The invention is characterised in that it consists in using a catalyst comprising a bimetal ruthenium/tin catalytic agent. Said catalytic agent is obtained by reacting ruthenium chloride and tin chloride in an acid medium. In practice, the catalyst is formed by a silica powder support impregnated by the ruthenium/tin catalytic agent.