Patent ID: 7820589
Filing Date: 2010-10-26
Classification: B01J,B82Y

Abstract:
1. A composite product, comprising: an active medium which demonstrates strong Lewis acid or base properties; a photocatalytic component comprising an active phase of spherical aggregates of titanium dioxide in an amorphous state chemically linked to an active medium surface, said photocatalytic component generating free charge carriers, electrons and positive holes when stimulated by light; wherein said active medium being an acceptor medium in a solid state having Lewis acid sites (cations), or a donor medium in a solid state having free electrons; wherein said acceptor medium is selected from a group consisting of silica, aluminum oxide, aluminum phosphate or zirconium oxide, manifesting Lewis acid properties; and wherein said donor medium is a metal medium manifesting Lewis base properties such that (a) when said active medium is an electron acceptor, the electrons of said photocatalytic component stimulated by the light are attracted by the acid sites of said active medium, and (b) when said active medium is an electron donor, the positive holes of the photocatalytic component stimulated by the light are decimated by the free electrons of the active medium, thereby preventing the immediate recombination of the free charge carriers of the photocatalytic component.