B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/52.J
B01J 23/00 (2006.01) B01J 21/06 (2006.01) B01J 23/20 (2006.01) B01J 23/46 (2006.01) B01J 27/04 (2006.01) C01B 3/04 (2006.01)
Patent
CA 1177049
A B S T R A C T "CATALYSTS FOR PHOTO-ASSISTED OXIDATION-REDUCTION REACTIONS" This invention relates to catalysts for photo-assisted (i.e. promoted by light) oxidation-reduction (redox) reactions. These catalysts consist of colloidal particles of a semiconductor, containing on their surface a reduction catalyst and an oxidation catalyst. In a first class of catalysts, the semiconductor has a difference of energy between the valence band and the conduction band such as to permit the hole-electron separation by absorption of visible light; this semi- conductor is selected, in the case of the photodecom- position of water, from TiO2 doped with Mn, Cr or Cr and Nb; CdS doped with In or Ga; SrTiO3 doped with Cr or Mn; gallium phosphide and cadmium sulphoselenide; in the case of other photodecomposition reactions, the semiconductor is selected from the above-mentioned compounds and CdS. In a second class of catalysts, the semiconductor has a difference of energy between the valence band and the conduction band such as not to permit the hole-electron separation by absorption of visible light; this semi- conductor is selected, in the case of the photodecom- position of water, from SrTiO3 and Nb2O5; in the case of other photodecomposition reactions, the semiconductor is selected from the above-mentioned compounds and TiO2 doped with Nb.
407363
Scotti Carlo
Visca Mario
Marks & Clerk
Sibit S.p.a.
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