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采用浸渍法制备了碱土金属氧化物MO(MgO、CaO、SrO和BaO)掺杂的MO-CeO2催化剂,通过X-射线粉末衍射、H2程序升温还原和CO2程序升温脱附等手段表征了催化剂的结构和表面性质,并考察其对1,4-丁二醇选择性脱水合成3-丁烯-1-醇反应的催化性能.结果表明,碱土金属氧化物掺杂未改变CeO2的萤石型结构,但可增加MO-CeO2催化剂的氧缺陷位和表面碱性位点,进而提高其催化1,4-丁二醇选择性脱水的活性和3-丁烯-1-醇的选择性.其中,CaO-CeO2催化剂表现出最优的催化性能,3-丁烯-1-醇收率达52.44%.
The MO-CeO2 catalysts doped with alkaline earth metal oxides MO (MgO, CaO, SrO and BaO) were prepared by impregnation. The catalysts were characterized by X-ray powder diffraction, temperature programmed reduction with H2 and temperature programmed desorption by CO2. Structure and surface properties of the catalyst were investigated and their catalytic performance for the selective dehydration of 1,4-butanediol to 3-buten-1-ol was investigated. The results show that the alkaline earth metal oxide doping does not change the fluorite structure of CeO2 , But can increase the oxygen defect sites and the surface basic sites of the MO-CeO2 catalyst, thereby enhancing its selectivity for dehydration of 1,4-butanediol and 3-buten-1-ol, CaO-CeO2 catalyst showed the best catalytic performance, 3-buten-1-ol yield of 52.44%.