III International Conference

PP-I-3It is suggested that during photocatalytic reaction of oxidation, the oxidized gas-phasemolecule (CO, H 2 , NO, SO 2 , hydrocarbons) interacts with surface lattice oxygen at themoment of its discharge by a free mobile hole (Fig. 1) [3].Ene rgySolidphaseGasphaseIllustrative exampleshveCBO 2e + S + Oe + O-O + O2 s sO- 2-sshVBCO2-h + O + COh + ese + COs s 2recombinationSuch mechanism assumes that the quantum efficiency of photocatalytic reaction dependsupon the bond energy of surface lattice oxygen; i. e. the quantum yield can also be determinedby chemical characteristics of photocatalysts – metal oxides. This view substantiated that inagreement with the proposed mechanism, the related to semiconductor metal photocatalyticoxidation reaction does not require an active surface center.ReferencesZakharenko V.S. Catalysis Today, 39 (1997) 243.Zakharenko V.S. Topics in Catalysis,35 (2005) 231.Parmon V.N. and Zakharenko V.S. CatTech, 4 (2000) 2.12