Supported loaded semiconductors （MoO3,ZnO）-TiO2/SiO2 were pre pared by an isovolumetric impregnation method from TiO2/SiO2 pre pared by chemical modification reaction. The chemisorption property and photon a bsorpti...Supported loaded semiconductors （MoO3,ZnO）-TiO2/SiO2 were pre pared by an isovolumetric impregnation method from TiO2/SiO2 pre pared by chemical modification reaction. The chemisorption property and photon a bsorption ability of MoO3-TiO2/SiO2 and ZnO-TiO2/SiO 2 were investigated by BET, UV-Vis DRS, IR and TPD-MS techniques. The gas -phase photocatalytic reaction of CH4 with H2O was performed at 150 ℃ in a fixed-bed annular reactor. The results show that the conversion of met hane and the selectivity of methanol reach to 5.1% and 87.3% respectively over MoO3-TiO2/SiO2, and MoO3-TiO2/SiO2 ex hibits higher photocatalytic acivity than ZnO-TiO2/SiO2.展开更多
分别采用浸渍法和溶胶 -凝胶法制备了 Mo O3/ Si O2 催化剂 ,用 XRD、TPR、IR、TPD和活性评价等手段对催化剂的结构、晶格氧活泼性、化学吸附性能和异丁烷选择氧化反应性能进行了研究 .结果表明 ,催化剂表面由 L ewis碱位 Mo=O、Mo- O-...分别采用浸渍法和溶胶 -凝胶法制备了 Mo O3/ Si O2 催化剂 ,用 XRD、TPR、IR、TPD和活性评价等手段对催化剂的结构、晶格氧活泼性、化学吸附性能和异丁烷选择氧化反应性能进行了研究 .结果表明 ,催化剂表面由 L ewis碱位 Mo=O、Mo- O- Mo中的晶格氧和 L ewis酸位 Mo6 + 构成 ;在 Mo O3/ Si O2 催化剂上 ,异丁烷主要通过甲基的 H双位吸附在表面的 L ewis碱位 Mo=O上 ;在常压条件下 ,异丁烷选择氧化产物主要为异丁烯、甲基丙烯醛和甲基丙烯酸 ,其中深度氧化产物 CO2 主要由吸附的异丁烯继续反应生成 ;采用溶胶 -凝胶法制备的Mo O3/ Si O2 催化剂 。展开更多
文摘Supported loaded semiconductors （MoO3,ZnO）-TiO2/SiO2 were pre pared by an isovolumetric impregnation method from TiO2/SiO2 pre pared by chemical modification reaction. The chemisorption property and photon a bsorption ability of MoO3-TiO2/SiO2 and ZnO-TiO2/SiO 2 were investigated by BET, UV-Vis DRS, IR and TPD-MS techniques. The gas -phase photocatalytic reaction of CH4 with H2O was performed at 150 ℃ in a fixed-bed annular reactor. The results show that the conversion of met hane and the selectivity of methanol reach to 5.1% and 87.3% respectively over MoO3-TiO2/SiO2, and MoO3-TiO2/SiO2 ex hibits higher photocatalytic acivity than ZnO-TiO2/SiO2.
文摘分别采用浸渍法和溶胶 -凝胶法制备了 Mo O3/ Si O2 催化剂 ,用 XRD、TPR、IR、TPD和活性评价等手段对催化剂的结构、晶格氧活泼性、化学吸附性能和异丁烷选择氧化反应性能进行了研究 .结果表明 ,催化剂表面由 L ewis碱位 Mo=O、Mo- O- Mo中的晶格氧和 L ewis酸位 Mo6 + 构成 ;在 Mo O3/ Si O2 催化剂上 ,异丁烷主要通过甲基的 H双位吸附在表面的 L ewis碱位 Mo=O上 ;在常压条件下 ,异丁烷选择氧化产物主要为异丁烯、甲基丙烯醛和甲基丙烯酸 ,其中深度氧化产物 CO2 主要由吸附的异丁烯继续反应生成 ;采用溶胶 -凝胶法制备的Mo O3/ Si O2 催化剂 。
