Abstract
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.
Original language | English |
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Pages (from-to) | 91-96 |
Number of pages | 6 |
Journal | Microporous and Mesoporous Materials |
Volume | 144 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 2011 Oct |
Externally published | Yes |
Keywords
- CHA type zeolite
- Ethanol conversion
- FAU type zeolite
- Interzeolite conversion
- Seed crystal
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials