Effect of Residual Anions (Cl-, So42-, No3-) Over Mn2o3 on its Catalytic Performance for the Photothermal Catalytic Oxidation of Toluene

Abstract

Anions exposed on the surface of catalysts significantly influence their catalytic performance. SO42-, Cl-, NO3-, and CH3COO- are usually residual anions in Mn2O3 during the synthesis process. When applied in photothermal catalytic oxidation of toluene, Mn2O3 with these anions always demonstrates decline activity because the residual anions block the Mn2+/Mn3+ active sites, shield the oxygen vacancies, cubing the production of active oxygen species (O2-, O-). Therefore, decreased amount of radicals accounts for the dropped catalytic efficiency, which is incapacitated in deeply oxidizing the intermediates and cutting off the reaction process. The poisoning effect of these anions ranks in the order of CH3COO-

Keywords: Toluene, Mn2O3, photothermal catalytic, poisoning effect