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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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改性H-ZSM-34上氯甲烷催化转化制低碳烯烃
DOI: 10.1016/S1872-2067(12)60681-0, PP. 2047-2056
Keywords: 氯甲烷,低碳烯烃,H-ZSM-34,乙二胺四乙酸二钠处理,铈修饰,酸性
Abstract:
？比较了几种典型的沸石分子筛在氯甲烷转化制乙烯、丙烯和丁烯等低碳烯烃反应中的催化性能,发现H-ZSM-34具有较佳的催化活性和选择性.经乙二胺四乙酸二钠(Na2H2EDTA)水溶液处理,并经离子交换及焙烧后,H-ZSM-34上氯甲烷转化制低碳烯烃的催化性能显著改善.当Na2H2EDTA浓度为0.1mol/L,反应温度为673K,CH3Cl分压9.2kPa时,C2-C4烯烃选择性和收率分别达82%和61%.研究还发现,Ce修饰H-ZSM-34催化剂同样可改善氯甲烷制低碳烯烃的选择性和收率.表征结果表明,Na2H2EDTA处理和Ce修饰均降低了H-ZSM-34的酸性.酸性的降低可抑制低碳烯烃的氢转移反应,继而避免了其进一步转化为低碳烷烃.
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