Photocatalytic Reaction Properties Of Methane And Water

The photocatalytic oxidation methane to methanol directly is one of the important attention and study subject by scholars now. In this paper have studied the use of compound semiconductor materials photocatalytic oxidation methane and water to methanol in the gas-solid-phase photocatalytic system. We have discussed the preparation technology of compound semiconductor material, and it’s chemical composition, surface structure, light response performance and photocatalytic performance.The compound semiconductor material WO3-TiO2was prepared by a sol-gel method. The catalyst WO3-TiO2supported metallic Cu was prepared by a isovolumic impregnation method. The surface nature and structure, light response performance of the materials were characterized by XRD, IR and UV-Vis. And have studied the reaction performance of the catalyst for photocatalytic methane and water to methanol. Experiments show that calcining temperature, the doping quantity of WO3and metal Cu load will affect performance of catalyst. The results show that adding WO3make TiO2photocatalytic activity improve, expanding the light excitation wavelength range. The incorporation of Cu metal increase the UV light absorption of material, the compound semiconductor happen blue shift, and the visible absorption of material have enhanceded obviously, broaden the light response range of compound semiconductor. When catalyst"s calcine temperature is600℃, WO3mole fraction is10%, metal Cu mole fraction is1%. the photocatalytic performance is the best.The various reaction factors of the catalytic activity were discussed. The research showed that, reaction temperature, catalyst dosage, the ratio of reactants and the light irradiation time all have certain influence on the reaction. The results show that:the photocatalytic activity is the best when under the conditions of160℃, catalyst dosage is0.7g, n(CH4)/(H2O) is1.4. light irradiation60min, to get the methane conversion is6.8%. methanol selectivity is22%.After integrated the studies on the reaction, this paper have discussed the reaction mechanism of the compound semiconductor load Cu photocatalytic methane and water, and the impact of composite effect, metal load and light absorption performance on compound semiconductor load metal photocatalytic performance. Figure [27] Table [8] Reference [68]...