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OALib Journal期刊
ISSN: 2333-9721
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二甲基二硫醚对ni/al2o3催化剂加氢性能的影响
, PP. 833-838
Keywords: 二甲基二硫醚,ni/al2o3,加氢反应,失活机理
Abstract:
？考察了二甲基二硫醚（ch3ssch3）对ni/al2o3催化剂上苯、环己烯和苯乙烯加氢活性的影响，并采用bet、xrd、h2-tpr、xps、sem和ea等手段对催化剂进行表征。实验结果表明，在ch3ssch3存在下，ni/al2o3催化剂对苯和环己烯加氢迅速失活，且环己烯加氢对ch3ssch3的耐硫性要略强于苯加氢，而苯乙烯中共轭烯烃的加氢转化率则维持100%长时间不变。ch3ssch3的影响顺序为芳环>单烯烃>共轭烯烃。此外，通过设计实验研究了ch3ssch3对催化剂的毒化机理，发现ch3ssch3分子首先吸附在催化剂的表面，并发生氢解生成甲烷随尾气逸出，故ch3ssch3分子中碳对催化剂的失活影响较小，而留下的硫原子则与镍活性组分发生相互作用，毒化催化剂。
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