Abstract
In this state-of-the-art review that starts with general aspects of the Chemical Vapor Phase Deposition (CVD) technique, some mention of other areas related to catalysis, particularly with respect to preparation methods for materials with specific electronic properties. Surface properties of the support material influence the adsorption states of Pt(acac)2, Cr(acac)3 and V(acac)3, the decomposition pathways of the adsorbates, and finally the dispersion of the catalytic compound. The deposited particles are more mobile on SiO2and hence are more capable of agglomerating Al203-supported Pt is presumably stabilized by coordinatively unsaturated AI3+ surface ions; similar arguments probably apply for the stabilization of amorphous Cr2O3 and V2O5of alumina. Because the metal acetylacetonate decomposition is accompanied by deposition of carbonaceous compounds, an additional air treatment of the samples is required to accomplish a carbon-free surface.
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