Fe/ZrO2催化剂气相催化裂解1,1,2-三氯乙烷脱氯化氢性能  

Gasphase dehydrochlorination of 1,1,2-trichloroethane over Fe/ZrO2 catalysts

作　　者：董朝霞 宋通洋 鲁继青[1] 罗孟飞[1] Dong Zhaoxia;Song Tongyang;Lu Jiqing;Luo Mengfei(Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321004,Zhejiang,China)

机构地区：[1]浙江师范大学化学与生命科学学院教育部先进催化材料重点实验室

出　　处：《工业催化》2019年第5期45-51,共7页Industrial Catalysis

基　　金：浙江省自然科学基金(No.LY16B070001)资助项目

摘　　要：采用浸渍法制备系列不同负载量的Fe/ZrO2催化剂,用于气相催化裂解1,1,2-三氯乙烷脱氯化氢性能的研究。结果表明,反应温度为350℃时,负载Fe质量分数为1%的1Fe/ZrO2催化剂催化活性最好,1,1,2-三氯乙烷转化率约95.0%,顺式1,2-二氯乙烯选择性为91.0%,反应50h性能稳定不失活,1,1,2-三氯乙烷转化率约92.0%,顺式1,2-二氯乙烯选择性约90.0%。单一ZrO2载体上的脱氯反应初始转化率为90.0%,经过1h反应即快速失活。ZrO2催化剂失活归因于ZrO2表面酸性较强导致积炭。对于Fe/ZrO2催化剂,Fe物种不但提供新的活性位点,而且降低了催化剂的表面强酸性中心,使催化剂催化活性更高,稳定性更好。A series of Fe/ZrO2 catalysts with different loading amount were prepared by an impregnation method and tested for the gas phase dehydrochlorination of 1,1,2-trichloroethane(TCE)to synthesize cis-1,2-dichloroethylene(cis-DCE).Results showed that 1Fe/ZrO2 catalyst with Fe mass content of 1%showed the best activity and stability in 50 h,with 1,1,2-trichloroethane conversion of 95.0%and cis-DCE selectivity of 90.0%when reaction temperature was 350℃.The pristine ZrO2 catalyst had high initial activity with 1,1,2-trichloroethane conversion of 90.0%,but it deactivated after 1h of reaction.The results reveal that strong acid sites on ZrO2 surface are responsible for the deposition of coke and consequently catalyst deactivation.The addition of Fe in Fe/ZrO2 catalysts decreases amounts of strong acid sites and generates new active sites to enhance activity and stability of catalysts.

关 键 词：催化化学 Fe/ZrO2催化剂 强酸中心 1 1 2-三氯乙烷 氯化氢 顺式-1 2-二氯乙烯 

分 类 号：O643.36[理学—物理化学] TQ222.214[理学—化学]