CuO-ZnO-ZrO2催化剂低温深度脱除液相丙烯中微量CO性能的研究

CuO-ZnO-ZrO2 Catalyst for Deep Removal of Trace Amount of Carbon Monoxide in Propylene at Low Temperature

摘要:

本文采用共沉淀法、在较优的条件下制备得到CuO-ZnO-ZrO2催化剂，并研究其在低温脱除液相丙烯中微量CO的应用情况。通过XRD、BET、SEM等测试表明，CuO-ZnO-ZrO2催化剂中的ZrO2以无定型状态存在，可以显著增大比表面积和孔容积，促进了CuO和ZnO的分散。在CO脱除应用中，还原预处理对于催化剂是必不可少的一步，并且还原温度显著影响催化剂的CO脱除性能。160 ℃还原活化的催化剂具有77.3 %的还原度，在50 ℃、3.0 MPa的反应条件下，可将液相丙烯中10 ppm含量的CO脱除低至0.02 ppm，达到聚合级烯烃对CO脱除深度的要求，并且稳定性能良好。CO2杂质的引入降低了CuO-ZnO-ZrO2催化剂对CO的脱除深度，表明CO2气氛对CO的脱除起到一定的抑制作用。

Abstract:

The removal performances of trace amount of carbon monoxide in liquid propylene at low temperature was studied on the CuO-ZnO-ZrO2 catalyst prepared by an optimized co-precipitation method. The catalyst was characterized by means of XRD, BET and SEM. It is found that ZrO2 existed in amorphous form, which could increase surface area and pore volume, and improve the dispersion of CuO and ZnO particles. The pre-treatment of catalyst was necessary for its application in the removal of CO, and the reduction temperature influenced the catalyst activity significantly. The experiments revealed that the catalyst activated at 160℃ with proper reduction degree of 77.3% exhibited the excellent removal performance of trace amount of carbon monoxide which could remove the CO in liquid propylene from 10 ppm to lower than 0.02 ppm with good stability of 1500 min under the conditions of 50 ℃ and 3.0 MPa. The introduced CO2 into the feed reduced the removal depth of CO on CuO-ZnO-ZrO2 catalyst, which indicated that CO2 had a certain degree of inhibitory effect in CO oxidation.