CATALYST CONTAINING LARGE AMOUNTS OF NOBLE METAL DISPERSED ON HYDROPHOBIC MOLECULAR SIEVES

摘要

A catalytic composition comprising silicalite impregnated with a noble metal at more than 8 weight percent loading and with at least 60% dispersion is obtained by pretreating the silicalite with a base and thereafter impregnating the base treated silicalite with a noble metal compound in two steps separated by calcination. Platinized silicalite so prepared may be dispersed in a poly(tetrafluoroethylene) matrix and used as a fixed bed to catalyze isotopic exchange between gaseous hydrogen and water vapor arising from a mass of liquid water flowing over the fixed catalyst bed.