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

Journal Article · · Chemistry of Materials
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  1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
  2. Departments of Bioengineering and Physics & Astronomy, Rice University, Houston, Texas 77005, United States
  3. Chevron Energy Technology Company, Richmond, California 94802, United States
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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.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-03ER15456
OSTI ID:
1225234
Alternate ID(s):
OSTI ID: 1439315
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Vol. 27 Journal Issue: 22; ISSN 0897-4756
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

References (20)

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A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses journal January 2012
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The synthesis of aluminophosphate and germanosilicate LTA using a triquaternary structure directing agent journal December 2014
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Unraveling the Reaction Mechanisms Governing Methanol-to-Olefins Catalysis by Theory and Experiment journal April 2013
Synthesis Strategies for Preparing Useful Small Pore Zeolites and Zeotypes for Gas Separations and Catalysis journal July 2013
A Rational Approach to the Ionothermal Synthesis of an AlPO4 Molecular Sieve with an LTA-Type Framework journal May 2010
Steam-stable hydrophobic ITQ-29 molecular sieve membrane with H2 selectivity prepared by secondary growth using Kryptofix 222 as SDA journal January 2010
Preparation of ITQ-29 (Al-free zeolite A) membranes journal April 2008

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