Diffusion-Driven Selectivity in Oxidation of CO in the Presence of Propylene Using Zeolite Nano Shell as Membrane

Abstract

The selective oxidation of CO over C 3 H 6 is achieved in yolk-shell Pt@Silicalite-1 catalysts in which Pt nanoparticles are encapsulated in hollow silicalite-1 single crystals. The thin shell operates as a permselective membrane which limits Pt surface poisoning by C 3 H 6 . From adsorption measurements, we conclude that the catalytic selectivity arises from the fastest diffusion of CO over C 3 H 6 through the silicalite-1 membrane.