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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Zn物种对乙烯芳构化反应过程的影响
DOI: 10.1016/S1872-2067(14)60289-8, PP. 880-888
Keywords: 乙烯,芳构化,锌物种,HZSM-5,脱氢作用
Abstract:
？分别采用离子交换法和物理混合法制备了不同Zn含量的ZSM-5分子筛催化剂,采用X射线衍射、扫描电子显微镜、N2物理吸附、氨程序升温脱附、吡啶红外吸附光谱、紫外-可见光谱和X射线光电子能谱等技术研究了催化剂的结构、表面性质及Zn物种种类,探讨了Zn物种存在状态对乙烯芳构化反应的影响.结果表明,引入到HZSM-5中的Zn物种包括三种状态,即ZnO晶体、存在于分子筛孔道中的ZnO团簇以及Zn和分子筛质子酸中心通过固相反应生成的Zn(OH)+物种;不同的制备方法显著影响Zn物种的分布.比较了制备方法和Zn含量对ZSM-5分子筛催化剂在乙烯芳构化反应中性能的影响,发现Zn(OH)+物种是芳构化的主要活性中心,同时ZnO物种的存在有助于乙烯制芳烃反应的发生.
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