Efficient liquid-phase ethylation of benzene with ethylene over mesoporous MCM-22 catalyst

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• 作者：Bin Zhang ; Zhendong Wang ; Peng Ji ; Yueming Liu ; Hongmin Sun ; Weimin Yang ; Peng Wu
• 关键词：Mesoporous zeolites ; MCM-22 ; Carbon templating ; Liquid-phase alkylation ; Ethylbenzene
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：179
• 期：Complete
• 页码：63-68
• 全文大小：1176 K

文摘

Mesoporous MCM-22 zeolites with Si/Al ratios of 15-45 were hydrothermally synthesized through a hard template technique by carbon black particles. The physicochemical properties of mesoporous MCM-22 were characterized by XRD, SEM, N₂ adsorption, TEM, XPS, ICP, TGA-DTA and NH₃-TPD techniques. In comparison with conventional MCM-22, mesoporous MCM-22 showed an obvious hysteresis loop in N₂ adsorption-desorption isotherm, and possessed 4-10 nm mesopores as well as a larger external surface area. The presence of mesopores was beneficial to increase the accessibility of zeolitic acid sites and to decrease the mass transfer limitations of bulky molecules. When employed to liquid-phase ethylation of benzene with ethylene, mesoporous MCM-22 exhibited higher ethylene conversion, higher selectivity to ethylated benzenes and better stability than conventional MCM-22, potentially serving as a solid-acid catalyst in petrochemical industry.