Deep catalytic oxidation of benzene, toluene, ethyl acetate over Pd/SBA-15 catalyst: Reaction behaviors and kinetics

This work aimed at investigating the reaction behaviors and kinetics of catalytic oxidation of benzene, toluene, and ethyl acetate over Pd/SBA-15 catalyst. Results for single components show that toluene (T ₅₀ = 185-215°C) is more easily oxidized than ethyl acetate (T ₅₀ = 220-255°C) and benzene (T ₅₀ = 215-290°C). The conversion of toluene and benzene decreases continuously as their inlet concentrations are increased. The conversion of ethyl acetate increases slightly when its feed concentration increases in a small range, while this trend is not kept when the concentration is further raised. Results for multicomponents reveal that the presence of benzene or toluene inhibits the conversion of ethyl acetate, and the aromatic hydrocarbons inhibit each other. Ethyl acetate has an inhibitory effect on benzene, while it is interested to note that the promotion behaviors are observed for toluene. Kinetic results of all studied volatile organic compounds obtained in the absence of diffusion limitations are fit to the Mars-van Krevelen expressions.