Oxygen isotopic heteroexchange

Figure 6. Initial rates vs Pt contents of the Pt/TiC>2 specimens for liquid methanol (A) or 1-propanol. (B) dehydrogenation at 298 K cyclopentane-deuterium exchange in gas phase at 263 K (C) oxygen isotope heteroexchange at 298 K over non-preoxidized (D) or preoxidized (E) samples.

Transport properties of electrolytes were studied by the impedance spectrometry and the oxygen isotope heteroexchange. Conductivity measurements were carried out with a Hewlett... 

Moreover, the isotopic heteroexchange of oxygen is a very sensitive photoassisted gas-solid reaction. For example, it is much more affected by the texture (33) or by the doping (35) of Ti02 samples than the oxidation of different organic compounds in gas (33, 35), liquid or aqueous solutions (35). It can therefore be used to evaluate more precisely the effect of various treatments. 

In the analysis of O2 isotopic redistribution between molecules of the gas phase, and isotopic heteroexchange between the gas phase and surface oxygen atoms of a solid oxide (0)s, three routes of exchange must be taken into account [52-56] ... 

Simple heteroexchange (Type II, R or R ), which involves one surface oxygen atom from the metal oxide, 0(s), and one atom from the isotope gas molecule according to the following steps ... 

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