HZSM-5催化乙醇脱水停料效应的研究

张叶龙 李媛媛 贾忱 韩毓旺 胡燚

引用本文: 张叶龙, 李媛媛, 贾忱, 韩毓旺, 胡燚. HZSM-5催化乙醇脱水停料效应的研究[J]. 燃料化学学报, 2013, 41(12): 1495-1501. shu
Citation:  ZHANG Ye-long, LI Yuan-yuan, JIA Chen, HAN Yu-wang, HU Yi. Research on stop-effect on the catalytic dehydration of ethanol over HZSM-5[J]. Journal of Fuel Chemistry and Technology, 2013, 41(12): 1495-1501. shu

HZSM-5催化乙醇脱水停料效应的研究

    通讯作者: 韩毓旺,Tel:13913996723;E-mail:hanyw@njut.edu.cn。
  • 基金项目:

    江苏省自然科学基金(BK2009494);中石化科技开发项目(L411003);材料化学工程国家重点实验室自主研究课题重点资助项目(ZK200815)。 

摘要: 在HZSM-5分子筛催化乙醇脱水反应中观察到了停料效应:即当停止乙醇-水进料一定时间,恢复进料后乙烯选择性明显提高。通过考察不同反应条件下的停料效应,发现乙醇质量分数控制在55%附近、延长停料时间、升高反应温度和降低乙醇进料空速会提高停料效应强度,并较长时间维持高乙烯选择性。500 h的催化剂稳定性测试表明,停料效应可有效延长催化剂的使用寿命。结合含水乙醇脱水反应机理和实验结果,推测HZSM-5催化乙醇脱水停料效应产生的原因是停料时乙氧基中间体的积累和催化活性空位的再生。

English

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  • 收稿日期:  2013-04-22
  • 网络出版日期:  2013-06-05
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