Isotopic exchange of oxygen

H02 + H02 - H202 + 02 -, thus inducing isotopic exchange of oxygen without scrambling (8). 

The adsorption, desorption, and isotopic exchange of oxygen on an oxide surface may be written schematically in a number of ways including the following, where 1802 or 180 represents a species enriched in 180 and ej an electron from the solid ... 

When platinum loading is varied on 2 orders of magnitude (0.1 < Pt% <10%), but with a constant particle size 2 nm), there exists an optimum content equal to v 0.5 wt Pt% at which the rate of CDIE is maximum (Fig.3). This optimum is characteristic of the Pt/Ti02 system since it has been found for other photocatalytic reactions, as well in the liquid or aqueous phase (dehydrogenation of (C,- C ) - alcohols (22) or of unsaturated ones (34)(curves (1) and (2 in Fig (3) as in the gas phase (photocatalytic isotopic exchange of oxygen (35)). Such an optimum is general and can be observed for other metals. It was found equal to 5 wt% for nickel (36) and seems to depend upon the nature and especially on the texture (particle size and dispersion) of the metal. 

Throughout this chapter exchange will often be used as a short form of isotopic exchange of oxygen . 

Isotopic Exchange of Oxygen Over Oxide Surfaces... 

Since numerous studies have been devoted to the isotopic exchange of oxygen on oxide catalysts, a brief review of the theoretical models developed will first be presented, before examining in detail the isotopic exchange in supported metal catalysts. 

Mechanisms of isotopic exchange of oxygen on oxide-supported cataiysts... 

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