Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 22, Pages 7774-7779Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03579
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Funding
- Chevron Energy and Technology Company
- NDSEG
- U.S. Department of Energy, Basic Energy Sciences [DE-FG02-03ER15456]
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AZeolite A (LTA) has many large-scale uses in separations and ion exchange applications. Because of the high aluminum content and lack of high-temperature stability, applications in catalysis, while highly desired, have been extremely limited. Herein, we report a robust method to prepare pure-silica, aluminosilicate (product Si/Al = 12-42), and titanosilicate LTA in fluoride media using a simple, imidazolium-based organic structure-directing agent. The aluminosilicate material is an active catalyst for the methanol-to-olefins reaction with higher product selectivities to butenes as well as C-5 and C-6 products than the commercialized silicoalumniophosphate or zeolite analogue that both have the chabazite framework (SAPO-34 and SSZ-13, respectively). The crystal structures of the as-made and calcined pure-silica materials were solved using single-crystal X-ray diffraction, providing information about the occluded organics and fluoride as well as structural information.
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