P/HZSM-5分子筛催化剂催化乙醇制备低碳烯烃的研究

Catalytic conversion of ethanol to light olefins over P/HZSM-5 catalyst

采用（NH4）3PO4溶液浸渍改性HZSM-5分子筛,制备了P/HZSM-5催化剂,并使用微型固定床反应器考察其对乙醇催化脱水制备低碳烯烃的催化性能。结果显示,适当量的P改性得到的P/HZSM-5催化剂能显著提高丙烯和丁烯的选择性,抑制低碳烷烃C1~C4生成。在此基础上考察了反应温度、空速、反应时间对催化剂性能的影响。当催化剂P质量分数为3.0%,反应温度450℃,空速为3.16h-1时,反应得到的丙烯选择性高达30%。并使用TG-DTG热重分析手段对使用过的P/HZSM-5催化剂进行积炭失活表征与分析。

P/HZSM-5 catalysts were prepared by impregnating HZSM-5 with（NH4）3PO4 solution,and their catalytic properties for conversion of ethanol into light olefins were evaluated in a micro fix-bed reactor.The results showed that the HZSM-5 catalyst modified with a suitable amount of P could improve the selectivity to propylene and butylenes and inhibit the formation of C1-C4 alkanes.The influences of reaction temperature,space velocity and reaction time on the catalytic properties were also investigated.For the P/HZSM-5 catalyst with P mass fraction of 3.0%,the selectivity to propylene could achieve 30% under reaction temperature of 450℃ and space velocity of 3.16 h-1.Furthermore,the coked catalysts were characterized and analyzed by TG-DTG.