CrO_x/SBA-15介孔催化剂上丙烷在二氧化碳气氛中脱氢反应的研究  被引量:9

Chromium Oxide Supported on Mesoporous SBA-15 as Catalysts for Oxidative Dehydrogenation of Propane by CO_2

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作  者:缪建文[1] 周静[1] 宋国华[2] 范以宁[1] 龚超[1] 

机构地区:[1]南京大学化学化工学院 [2]南通大学理学院,南通226007

出  处:《无机化学学报》2005年第10期1541-1545,共5页Chinese Journal of Inorganic Chemistry

基  金:国家重点基础研究发展规划项目(No.G1999022400)资助

摘  要:The structure and catalytic properties based on Chromium Oxide supported on mesoporous SBA-15 for oxidative dehydrogenation of propane by CO2 have been studied by using X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS) and propane pulsing experiments in the absence of gas-phase O2. It has been shown that propane conversion and propene yield increase with Cr loadings. The propane conversion and propene yield on CrOx (Cr: 10wt%)/SBA-15 catalyst for oxidative dehydrogenation of propane by CO2 at 550 ℃ reach 24.8% and 21.8%, respectively .The results of ESR, UV-Vis DRS and propane pulsing experiments indicate that CrⅢ in the CrOx / SBA-15 catalyst is the main active species in oxidative dehydrogenation of propane by CO2 and CrⅥ, CrⅤ is inactive in dehydrogenation.The structure and catalytic properties based on Chromium Oxide supported on mesoporous SBA-15 for oxidative dehydrogenation of propane by CO2 have been studied by using X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS), electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS) and propane pulsing experiments in the absence of gas-phase O2. It has been shown that propane conversion and propene yield increase with Cr loadings. The propane conversion and propene yield on CrOx (Cr: 10wt%) /SBA-15 catalyst for oxidative dehydrogenation of propane by CO2 at 550 ℃ reach 24.8% and 21.8%, respectively .The results of ESR, lyst is the main active drogenation. UV-Vis DRS and propane pulsing experiments indicate that Cr^Ⅲ in the CrOx/SBA-15 cataspecies in oxidative dehydrogenation of propane by CO2 and Cr^Ⅳ, Cr^Ⅴ is inactive in dehydrogenation.

关 键 词:CrOx/SBA-15 催化剂 丙烷氧化脱氢 CO2 Cr^Ⅲ活性物种 

分 类 号:O614.611[理学—无机化学] O643[理学—化学]

 

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