Specific catalytic activity at the HZSM-5 surface for the polymerization of tetrahydrofuran

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• 作者：Hsia Chen ; Catherine S. ; Schramm ; Suzanne E. ; Wentzek ; Steven E.
• 关键词：HZSM-5 ; Surface catalytic activity ; Tetrahydrofuran ; Polymerization ; ¹³C NMR spectroscopy
• 刊名：Microporous Materials
• 出版年：1996
• 出版时间：June, 1996
• 年：1996
• 卷：6
• 期：4
• 页码：205-212
• 全文大小：489 K

文摘

The polymerization of tetrahydrofuran has been investigated by using medium- and large-pore zeolites as catalysts. HZSM-5 (SiO₂/Al₂O₃ = 70; small crystals) shows distinctly the highest activity. Under the same conditions, medium pore zeolite HZSM-23 (SiO₂/Al₂O₃ = 110; small crystals) and large-pore zeolites Hbeta, (SiO₂/Al₂O₃ = 37; small crystals), HMCM-22 (SiO₂/Al₂O₃ = 23; small crystals) and HECR-1 (SiO₂/Al₂O₃ = 8; small crystals) are far less active while Ultrastable HY (SiO₂/Al₂O₃ = 13; medium size crystals) is inactive. In addition, the activities of HZSM-5 (SiO₂/Al₂O₃ = 70; small crystals) and zeolite Hbeta (SiO₂/Al₂O₃ = 37; small crystals) are greatly reduced when they are surface deactivated by tetraphenylphosphonium bromide. Large crystal HZSM-5 (SiO₂/Al₂O₃ = 70; about 100 times larger than small crystals) appears inactive.