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- W2016281569 abstract "The reaction network of o-xylene oxidation to phthalic anhydride over V2O5/TiO2 (anatase) catalysts was determined in the present investigation. The detailed o-xylene conversion/product selectivity data obtained demonstrate that phthalic anhydride is not produced from the direct oxidation of o-xylene over V2O5/TiO2 (anatase) catalysts, but indirectly via a series of consecutive reaction steps involving o-tolualdehyde and phthalide intermediates. The maleic anhydride by-product is produced from the over-oxidation of phthalic anhydride. The influence of the two reactive sites in V2O5/TiO2 (anatase) catalysts, surface vanadium oxide monolayer and V2O5 crystallites, upon the o-xylene oxidation reaction were obtained for moderate amounts of vanadium oxide by varying the crystalline V2O5 content of the catalysts. The initial reaction step of the partial oxidation of o-xylene to o-tolualdehyde occurs almost exclusively over the surface vanadium oxide monolayer. The o-tolualdehyde intermediate is directly converted to phthalic anhydride primarily over the surface vanadium oxide monolayer and to phthalide over both the surface vanadium oxide monolayer and the V2O5 crystallites. The partial oxidation of phthalide to phthalic anhydride mostly occurs over the monolayer of surface vanadium oxide. The over-oxidation of phthalic anhydride to maleic anhydride also occurs primarily over the monolayer of surface vanadium oxide. The non-selective formation of the combustion products, CO and CO2, primarily occurs from the direct oxidation of o-xylene over the monolayer of surface vanadium oxide. The turnover rate for o-xylene oxidation over V2O5/TiO2(anatase) catalysts is determined for the first time, and found to be ~1 x 10−3 molecules site−1 s−1 for the experimental conditions used in the present study. The apparent activation energy for the conversion of o-xylene to all products is found to be ~32 kcal mole−1." @default.
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- W2016281569 title "Reaction network and kinetics of o-xylene oxidation to phthalic anhydride over V2O5/TiO2 (anatase) catalysts" @default.
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- W2016281569 doi "https://doi.org/10.1016/s0166-9834(00)80668-5" @default.
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