Influence of oxygen vacancies on oxygenate reactions over SnO2(110) single crystal surfaces
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The adsorption of a number of BrÃ nsted acids of differing strengths has been studied on stoichiometric and defective Sn02(110) surfaces. The extent of dissociation of these acids depends on the surface composition and the strength of the acid. Two crystallographically inequivalent types of oxygen vacancies can be introduced onto SnO02 (110) surfaces, and the kinetics of the reactions of BrÃ nsted acids is influenced by the number and type of oxygen vacancies present on each surface. The site requirement for dissociation of BrÃ nsted acids has been described as a coordinatively unsaturated cation and an available anion. On the Sn002( 110) surfaces studied, this site requirement was seen to be a necessary but not sufficient condition for dissociation. In contradiction to the generally accepted idea that the presence of defects increases reactivity, the most defective SnO2 (110) surface considered showed the lowest activity for dissociation for all adsorbates studied.
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