逆水煤气变换耦合乙烷脱氢制乙烯催化反应的研究  

Dehydrogenation of Ethane to Ethylene in the Presence of CO_2 over Calcined Mg-Fe and Mg-Fe-Al Hydrotalcite Compounds as Catalysts

作　　者：葛欣[1] 胡胜华[1] 沈俭一[1] 

机构地区：[1]南京大学化学化工学院,南京210093

出　　处：《天然气化工—C1化学与化工》2003年第5期13-15,23,共4页Natural Gas Chemical Industry

基　　金：国家科技部 973项目(G1 9990 2 2 40 8);国家自然科学基金委重点项目 (2 0 2 3 3 0 40 )资助课题

摘　　要：用水滑石前驱体制备了Mg Fe O和Mg Fe Al O氧化物催化剂,研究了该催化剂在CO2气氛中乙烷脱氢催化活性。实验结果表明,添加Mg和Al元素有利于催化活性和乙烯收率的提高。MgFe0 5Al0 5Ox样品的活性较好,在700℃和V(CO2)/V(C2H6)=7时,乙烷转化率20 6%,乙烯收率18 8%。CO2的作用是通过逆水煤气变换反应(CO2+H2 CO+H2O)推动乙烷脱氢反应并提高乙烯的选择性,通过CO2+C 2CO反应消除表面积炭提高催化剂的稳定性。Calcined MgFe and MgFeAl hydrotalcite compounds were effective catalysts for the dehydrogenation of ethane to ethylene in the presence of CO2 as oxidant Xray diffraction patterns suggested that the catalyst components are distributed uniformly The coupling reaction of ethane dehydrogenation with reversed watergas shift reaction over these catalysts was studied with a fixedbed microreactor The activity of MgFe05Al05Ox oxide catalyst was the highest among the catalysts tested, with the selectivity to ethylene of about 914% at 206% ethane conversion and a maximum yield of ethylene of about 188% at 700℃ The function of carbon dioxide is to removed coke and hydrogen to accelerate dehydrogenation of ethane

关 键 词：乙烷脱氢 二氧化碳 乙烯 逆水煤气变换 Mg-Fe-O Mg-Fe-Al-O催化剂 

分 类 号：O643[理学—物理化学]