Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 144, Issue 1-3, Pages 91-96Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2011.03.041
Keywords
Interzeolite conversion; FAU type zeolite; CHA type zeolite; Seed crystal; Ethanol conversion
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The influence of seed crystals on the interzeolite conversion of FAU type zeolite into CHA type zeolite was investigated in the presence of benzyltrimethylammonium hydroxide as a structure-directing agent under various hydrothermal synthesis conditions. Pure and highly crystalline CHA type zeolites with a wide range of Si/Al ratios were obtained in a shorter crystallization time as compared with those obtained without seed crystals. Furthermore, we achieved the first successful synthesis of high-silica CHA type zeolite in the absence of Na+ cations by increasing the seed content. The protonated CHA type zeolite with a Si/Al ratio of ca. 15 yielded the highest propylene yield of ca. 48 C-% in ethanol conversion into light olefins. (C) 2011 Elsevier Inc. All rights reserved.
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