期刊
TOPICS IN CATALYSIS
卷 15, 期 2-4, 页码 195-200出版社
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1016693514135
关键词
vanadia; titania; antimony oxide; o-xylene oxidation; X-ray photoelectron spectroscopy; spreading; site isolation
Titania-supported vanadia catalysts were modified by addition of antimony oxide for application in o-xylene selective oxidation to phthalic anhydride. It was shown that active and selective catalysts can be prepared by ball-milling mixtures of powders of TiO2, V2O5 and Sb2O3 followed by calcination. X-ray photoelectron spectroscopy proves the formation of highly dispersed overlayers of vanadium oxide and antimony oxide, in which V5+ is partially reduced to lower oxidation states and Sb3+ is partially oxidized to Sb5+. Antimony oxide segregated into the outermost surface layers. It is therefore inferred that the presence of the antimony oxide modifier spatially separates V-O species and leads to site isolation which may be responsible for the positive effect of the modifier for the catalyst's selectivity.
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