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Title: Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA

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). Furthermore, the crystal structures of the as-made and calcined pure-silica materials were solved using singlecrystal X-ray diffraction, providing information about the occluded organics and fluoride as well as structural information.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ;  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States); Utrecht Univ., Utrecht (The Netherlands)
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States); ExxonMobil Research and Engineering Company, Annandale, NJ (United States)
  4. Rice Univ., Houston, TX (United States)
  5. Chevron Energy Technology Company, Richmond, CA (United States)
Publication Date:
Grant/Contract Number:
FG02-03ER15456
Type:
Published Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 27; Journal Issue: 22; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Research Org:
Rice Univ., Houston, TX (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1225234
Alternate Identifier(s):
OSTI ID: 1439315

Boal, Ben W., Schmidt, Joel E., Deimund, Mark A., Deem, Michael W., Henling, Lawrence M., Brand, Stephen K., Zones, Stacey I., and Davis, Mark E.. Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA. United States: N. p., Web. doi:10.1021/acs.chemmater.5b03579.
Boal, Ben W., Schmidt, Joel E., Deimund, Mark A., Deem, Michael W., Henling, Lawrence M., Brand, Stephen K., Zones, Stacey I., & Davis, Mark E.. Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA. United States. doi:10.1021/acs.chemmater.5b03579.
Boal, Ben W., Schmidt, Joel E., Deimund, Mark A., Deem, Michael W., Henling, Lawrence M., Brand, Stephen K., Zones, Stacey I., and Davis, Mark E.. 2015. "Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA". United States. doi:10.1021/acs.chemmater.5b03579.
@article{osti_1225234,
title = {Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA},
author = {Boal, Ben W. and Schmidt, Joel E. and Deimund, Mark A. and Deem, Michael W. and Henling, Lawrence M. and Brand, Stephen K. and Zones, Stacey I. and Davis, Mark E.},
abstractNote = {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 C5 and C6 products than the commercialized silicoalumniophosphate or zeolite analogue that both have the chabazite framework (SAPO- 34 and SSZ-13, respectively). Furthermore, the crystal structures of the as-made and calcined pure-silica materials were solved using singlecrystal X-ray diffraction, providing information about the occluded organics and fluoride as well as structural information.},
doi = {10.1021/acs.chemmater.5b03579},
journal = {Chemistry of Materials},
number = 22,
volume = 27,
place = {United States},
year = {2015},
month = {11}
}