Preparation of MnO2 with different crystal phases and catalytic performance in toluene combustion
Four kinds of crystalline MnO2 catalysts were prepared by alcohol reduction and hydrothermal method,and the effect of MnO2 crystal structure regulation on the catalytic oxidation of toluene was investigated.The structure of MnO2 catalyst was characterized and analyzed by XRD,SEM,N2 adsorption-desorption,TPR,TPD and other technical means,and the catalytic performance of the material to toluene was evaluated by the conversion rate of toluene catalytic oxidation.The results show that MnO2 catalysts with α,β,γ and δ crystal structures show different morphological characteristics and surface properties.The α-MnO2 prepared by ethylene glycol reduction method has more surface defect active sites,which balances the synergistic ratio of activated surface lattice oxygen and Mn4+ions,and is beneficial to the catalytic oxidation of toluene.When the toluene conversion reached 50％and 90％,the catalytic oxidation temperature of α-MnO2 catalyst increased to 210 ℃ and 219 ℃.The result can provide a reference for the preparation and efficient green application of transition metal Mn-based catalysts.
alcohol reductioncrystal phasecatalytic oxidation of toluenemanganese oxide
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