Abstract
AbstractTo obtain applicable catalysts for toluene combustion, Ru‐promoted Pr2Sn2O7 has been prepared with impregnation (Ru/Pr2Sn2O7) and hydrothermal method (Ru−Pr2Sn2O7). For the two Ru/Pr2Sn2O7 catalysts, Ru scatters on the surface of Pr2Sn2O7 as both metallic Ru and RuO2. In contrast, for the two Ru−Pr2Sn2O7 catalysts, Ru is substituted into Pr2Sn2O7 lattice as Ru4+. The distribution states of Ru affect significantly the active surface oxygen amount and the toluene adsorption capacity, which are the two major reasons influencing the reactivity. On Ru/Pr2Sn2O7, a greater quantity of active oxygen sites can be formed than on Ru−Pr2Sn2O7. Furthermore, the presence of surface Ru0 facilitates also toluene adsorption. As a consequence, the intrinsic activity of the two Ru/Pr2Sn2O7 catalysts are much higher than the two Ru−Pr2Sn2O7 catalysts. It is concluded that supporting Ru on Pr2Sn2O7 surface is a better way than doping Ru into its lattice to fabricate more active and applicable catalysts.
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