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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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hzsm-5催化乙醇脱水停料效应的研究
, PP. 1495-1501
Keywords: 乙醇脱水,乙烯,hzsm-5催化剂,停料效应
Abstract:
？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。500h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。
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