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Title: S{sup +}X{sup -}I{sup +} route to mesostructured materials from Fau and Beta zeolite precursors: A comparative study of their assembly behaviors in extremely acidic media

Abstract

Mesoporous molecular sieves were synthesized from Beta and Fau zeolite precursors through S{sup +}X{sup -}I{sup +} route under extremely acidic conditions in parallel (designated as M{sub Beta} and M{sub Fau}, respectively). The textural properties of M{sub Fau} were different from its M{sub Beta} counterpart but resembled normal MCM-41 silica from TEOS. Al content in M{sub Beta} was almost equivalent to that in the initial Beta zeolite precursors, whereas only trace Al species was present in M{sub Fau} from elemental analysis results. The hydrothermal stability of M{sub Beta} after post-synthesis ammonia treatment was considerably improved compared with normal MCM-41 aluminosilicates, whereas the M{sub Fau} after the same procedure was as unstable as normal MCM-41 silica. Thus, the assembly behaviors of Beta and Fau zeolite precursors were comparatively studied based on these results. The microstructure of Fau zeolite precursors were degraded by the extremely acidic condition, and Al species was dissolved into the synthesis mixture. However, Beta zeolite precursors survived the chemical attack of extremely acidic media and were incorporated into mesostructured framework as primary building units.

Authors:
 [1];  [1];  [1];  [1]
  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan 030001 (China)
Publication Date:
OSTI Identifier:
20725944
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 178; Journal Issue: 5; Other Information: DOI: 10.1016/j.jssc.2005.03.002; PII: S0022-4596(05)00095-2; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIA; MICROSTRUCTURE; MIXTURES; MOLECULAR SIEVES; PRECURSOR; SILICA; STABILITY; SYNTHESIS; ZEOLITES

Citation Formats

Junlin, Zheng, Shangru, Zhai, Dong, Wu, and Yuhan, Sun. S{sup +}X{sup -}I{sup +} route to mesostructured materials from Fau and Beta zeolite precursors: A comparative study of their assembly behaviors in extremely acidic media. United States: N. p., 2005. Web. doi:10.1016/j.jssc.2005.03.002.
Junlin, Zheng, Shangru, Zhai, Dong, Wu, & Yuhan, Sun. S{sup +}X{sup -}I{sup +} route to mesostructured materials from Fau and Beta zeolite precursors: A comparative study of their assembly behaviors in extremely acidic media. United States. doi:10.1016/j.jssc.2005.03.002.
Junlin, Zheng, Shangru, Zhai, Dong, Wu, and Yuhan, Sun. Sun . "S{sup +}X{sup -}I{sup +} route to mesostructured materials from Fau and Beta zeolite precursors: A comparative study of their assembly behaviors in extremely acidic media". United States. doi:10.1016/j.jssc.2005.03.002.
@article{osti_20725944,
title = {S{sup +}X{sup -}I{sup +} route to mesostructured materials from Fau and Beta zeolite precursors: A comparative study of their assembly behaviors in extremely acidic media},
author = {Junlin, Zheng and Shangru, Zhai and Dong, Wu and Yuhan, Sun},
abstractNote = {Mesoporous molecular sieves were synthesized from Beta and Fau zeolite precursors through S{sup +}X{sup -}I{sup +} route under extremely acidic conditions in parallel (designated as M{sub Beta} and M{sub Fau}, respectively). The textural properties of M{sub Fau} were different from its M{sub Beta} counterpart but resembled normal MCM-41 silica from TEOS. Al content in M{sub Beta} was almost equivalent to that in the initial Beta zeolite precursors, whereas only trace Al species was present in M{sub Fau} from elemental analysis results. The hydrothermal stability of M{sub Beta} after post-synthesis ammonia treatment was considerably improved compared with normal MCM-41 aluminosilicates, whereas the M{sub Fau} after the same procedure was as unstable as normal MCM-41 silica. Thus, the assembly behaviors of Beta and Fau zeolite precursors were comparatively studied based on these results. The microstructure of Fau zeolite precursors were degraded by the extremely acidic condition, and Al species was dissolved into the synthesis mixture. However, Beta zeolite precursors survived the chemical attack of extremely acidic media and were incorporated into mesostructured framework as primary building units.},
doi = {10.1016/j.jssc.2005.03.002},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 5,
volume = 178,
place = {United States},
year = {2005},
month = {5}
}