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제목   [16.05월] [Angewandte Chemie] 홍석봉 교수 연구실 EU-12: A Small-Pore, High-Silica Zeolite Containing Sinusoidal Eight-Ring Channels   이름  관리자
날짜  2016-05-16 11:18:03 조회  1695 추천  0
첨부   EU-12 A Small-Pore, High-Silica Zeolite Containing Sinusoidal Eight-Ring Channels.pdf(1562.73KB)

Title: EU-12: A Small-Pore, High-Silica Zeolite Containing Sinusoidal Eight-Ring Channels

Authors: Juna Bae, Jung Cho, Jeong Hwan Lee, Sung Man Seo, and Suk Bong Hong

Journal: Angewandte Chemie

Abstract: Zeolite EU-12, the framework structure of which has remained unsolved during the past 30 years, is synthesized at a specific SiO2/Al2O3 ratio using choline as an organic structure-directing agent, with both Na+ and Rb+ ions present. Synchrotron powder X-ray diffraction and Rietveld analyses reveal that the EU-12 structure has a two-dimensional 8-ring channel system. Among the two distinct 8-ring (4.6 2.8 and 5.0 2.7 ) channels along c axis, the smaller one interconnects with the sinusoidal 8-ring (4.8 3.3 ) channel along a axis. The other large one is simply linked up with the sinusoidal channel by sharing 8-rings (4.8 2.6 ) in the ac plane. The proton form of EU-12 was found to show a considerably higher ethene selectivity in the low-temperature dehydration of ethanol than H-mordenite, the best catalyst for this reaction.



The EU-12 framework structure: the projection down the c axis, showing the arrangement of the two types of 8-ring channels, labeled A and B, respectively. Note that while the Type A channels intersect with the sinusoidal channels, the Type B channels link to the sinusoidal ones via their 8-rings.

 

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