The Canadian Journal of Chemical Engineering · 1997 · 14 citations · 19 references
Natural SciencesChemical EngineeringChemistryCatalysisSurface ChemistrySurface ScienceCatalytic MaterialsCatalytic MechanismsCatalytic Reaction KineticsSurface CatalysisSurface OxidationSurface ReactionsCatalytic Elementary StepsCatalytic Surface KineticsElementary Reaction StepsOxidationSelective OxidationTemporal AnalysisTime ResolutionTransient Kinetic Analysis
Abstract The oxidation of o ‐xylene over a commercial V 2 O 5 /TiO 2 (anatase) catalyst was studied in the TAP (Temporal Analysis of Products) reactor system. The transient method with high time resolution has led to new insights into the reaction mechanism. The selective oxidation is shown to consist of a sequence of steps, involving intermediates which desorb as o ‐toluolaldehyde and phtalide. The key reaction step in the non‐selective oxidation is shown to be a decar‐bonylation of a surface species, leading to a surface benzoate. The kinetics of the elementary steps in the reaction were derived from a quantitative analysis of the transient responses on o ‐xylene pulses.
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