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Published November 24, 2015 | public
Journal Article Open

Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA

Abstract

Zeolite 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.

Additional Information

© 2015 American Chemical Society. ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Received: September 14, 2015. Revised: October 28, 2015. Published: November 5, 2015. The authors would like to thank Chevron Energy and Technology Company for providing funding for this work. J.E.S. would like to thank the NDSEG for their support through a fellowship. M.W.D would like to thank the U.S. Department of Energy, Basic Energy Sciences, for grant DE-FG02-03ER15456. The authors would like to thank Dr. Sonjong Hwang (Caltech) for his assistance with NMR data collection. B.W.B. and J.E.S. contributed equally to this work. The authors declare no competing financial interest.

Attached Files

Published - acs_2Echemmater_2E5b03579.pdf

Supplemental Material - cm5b03579_si_001.pdf

Supplemental Material - cm5b03579_si_002.cif

Supplemental Material - cm5b03579_si_003.cif

Supplemental Material - cm5b03579_si_004.cif

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