Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 26, Pages 7369-7373Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201600146
Keywords
aluminosilicates; ethanol dehydration; microporous materials; structure elucidation; zeolites
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Funding
- National Creative Research Initiative Program through the National Research Foundation of Korea [2012R1A3A-2048833]
- MSIP
- POSTECH
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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 x 2.8 and 5.0 x 2.7 angstrom) channels along c axis, the smaller one interconnects with the sinusoidal 8-ring (4.8 x 3.3 angstrom) channel along a axis. The other large one is simply linked up with the sinusoidal channel by sharing 8-rings (4.8 x 2.6 angstrom) 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.
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