Millen White Zelano & Branigan
Photochemical reactor element containing microcapsulated titanium dioxide photocatalyst
 A photochemical reactor element containing microcapsulated TiO.sub.2 photocatalyst particles dispersed in a polysiloxane matrix is disclosed. The polysiloxane matrix has an oxygen gas permeability not less than 1.times.10.sup.-14 mol.multidot.m.multidot.m.sup.-2.multidot.s.sup.-1.multidot.Pa.sup.-1. The photochemical reactor element is produced by dispersing the microcapsulated or naked TiO.sub.2 photocatalyst particles in a hydrolyzate-polycondensate sol of a trialkoxysilane or a mixture thereof with a tetra- and/or dialkoxysilane and then shaping the dispersion into the element. The naked TiO.sub.2 photocatalyst particles in the element are microcapsulated within a porous silica shell layer in situ by irradiating the element with UV radiation. 
Nihon Yamamura Glass Co., Ltd.
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Hideo Yoshinori Hiroyuki Zuyi
Yamada Tanigami Nishino Zhang