Abstract
Spectroscopic analysis by Raman, diffuse reflectance spectroscopy and electron spin resonance of adsorbed oxovanadium(IV) porphyrins is reviewed. Two forms of donor-acceptor interactions are identified, namely coordination of the vanadyl group to eitner basic or acidic surface sites. In both cases additional interactions between the macrocycle and the surface seem to be operative. The mode of adsorption is strongly governed by the acid base properties of the adsorbent or catalyst surface. The primary adsorption sites on alumina-supported Mo-catalysts in both the oxide precursor and the sulfided state appear to be located on uncovered alumina support surface.
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