CuO-ZnO/(SAPO-34)-高岭土催化CO2加氢合成低碳烯烃

以廉价的高岭土为原料,三乙胺为模板剂,采用水热法制备了负载型催化剂(SAPO-34)-高岭土。通过将CuO-ZnO负载于(SAPO-34)-高岭土表面制备了双功能催化剂CuO-ZnO/(SAPO-34)-高岭土,用XRD、SEM、EDS、BET、H_2-TPR及NH_3-TPD对合成的催化剂进行了表征,将其用于催化CO_2加氢制备低碳烯烃,在反应温度为673 K、反应压力为3 MPa、空速为1 800 m L/(g_(cat)·h)、V(CO_2)∶V(H_2)=1∶3的条件下,CO_2单程转化率为43.5%,低碳烯烃的选择性和产率分别为63.8%和27.8%。在连续8 h的催化性能测试中,低碳烯烃的产率最低为18.7%。

Hydrogenation of CO2 to Light Olefins on CuO-ZnO/(SAPO-34)-kaolin

Load-type methanol dehydration catalyst of (SAPO-34)-kaolin was prepared by hydrothermal method using kaolin as a low-cost material and triethylamine as template agent. The synthesized catalysts were characterized by XRD, SEM, EDS, BET, H2-TPR and NH3-TPD techniques. The results show the synthesized SAPO-34 molecular sieves prepared by Si and Al of kaolin grow in situ at the surface of residual kaolin. (SAPO-34)-kaolin has good dispersity and relatively high crystallinity. CuO-ZnO/(SAPO-34)-kaolin was prepared through loaded CuO-ZnO to the surface of (SAPO-34)-kaolin, which can be used for synthesis of light olefins from CO2 hydrogenation. Under the condition of temperature at 673 K, pressure at 3 MPa, airspeed at 1800 mL/(gcath) and V(CO2) / V(H2) = 1:3, the one-way conversion of CO2 could reach up to 43.5%, with a light olefins selectivity and yield of 63.8% and 27.8%, respectively. For a continuous performance as long as 8 h, the yield of light olefins is over 18.7%.