二氧化碳加氢一步法制低碳烯烃催化剂的研究

Catalysts for Synthesis of Light Alkenes From Carbon Dioxide Through Hydrogenation With One-Step Method

采用水热合成法制备了CuO-ZnO/SAPO-34复合催化剂,以CuO-ZnO为甲醇合成催化剂,以SAPO-34分子筛为甲醇脱水催化剂,研究了催化二氧化碳加氢一步法制备低碳烯烃的方法。通过XRD、TEM、SEM、IR和固定床反应活性评价,系统地考察了复合催化剂的物化性质和催化反应性能。在反应温度270℃、压力3.5MPa、n(H2)∶n(CO2)=4∶1、体积空速为1 600h-1的反应条件下,该催化剂表现出较好的活性和选择性。CO2的转化率可达到18.71%,乙烯、丙烯的产率分别达到9.27%和4.76%。

CuO- ZnO/SAPO- 34 composite catalyst was prepared by hydrothermal method, and applied in catalytic hydrogenation of carbon dioxide to light olefins in one--step process. CuO--ZnO was used to synthesis methanol from CO2, while SAPO--34 molecular sieve take the catalytic role of methanol dehydration to light olefins. The properties and catalytic activity of composite catalyst were investigated by XRD, TEM, SEM, IR and fixed bed response evaluation. When the reaction condition is reaction temperature 270 ℃, the reaction pressure 3.5 MPa, molar ratio of hydrogen/carbon dioxide 4, volumetric space velocity 1 600 h-1 , the catalyst shows good activity and selectivity. The conversion rate of CO2 can reach 18.71% ,and the yields of ethylene and propylene can reach 9. 270% and 4.76%.