A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses

doi:10.1016/S1872-2067(10)60291-4

催化学报 ›› 2012, Vol. 33 ›› Issue (1): 85-91.DOI: 10.1016/S1872-2067(10)60291-4

A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses

Minwei SUN1, Heather K. HUNT2, Christopher M. LEW1, Rui CAI1, Yan LIU1, Yushan YAN1,*

1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, USA; 2Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA

收稿日期:2011-08-23 修回日期:2011-10-02 出版日期:2012-01-16 发布日期:2015-05-26

A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses

Minwei SUN1, Heather K. HUNT2, Christopher M. LEW1, Rui CAI1, Yan LIU1, Yushan YAN1,*

1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, USA; 2Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA

Received:2011-08-23 Revised:2011-10-02 Online:2012-01-16 Published:2015-05-26

摘要/Abstract

摘要： Pure-silica-zeolite (PSZ) AST and LTA are synthesized successfully by using the same structure-directing agent (SDA) molecule, but at different concentrations. A dynamic organic SDA is proposed to discuss the mechanism of phase discrimination between AST and LTA. Data suggest that the SDA molecules can self-assemble into dimer or trimer complexes at different concentrations by π-π interactions, and these differences can be taken advantage of to selectively synthesize either PSZ AST or LTA. These deviations from the Liebau’s rules indicate that small changes in SDA chemistry, structure, and order in solution can have a great impact on the structure selectivity of the zeolite synthesis.

关键词: zeolite, synthesis, dynamic structure-directing agent, π-&pi, conjugation, Liebau’s rules

Abstract: Pure-silica-zeolite (PSZ) AST and LTA are synthesized successfully by using the same structure-directing agent (SDA) molecule, but at different concentrations. A dynamic organic SDA is proposed to discuss the mechanism of phase discrimination between AST and LTA. Data suggest that the SDA molecules can self-assemble into dimer or trimer complexes at different concentrations by π-π interactions, and these differences can be taken advantage of to selectively synthesize either PSZ AST or LTA. These deviations from the Liebau’s rules indicate that small changes in SDA chemistry, structure, and order in solution can have a great impact on the structure selectivity of the zeolite synthesis.

Key words: zeolite, synthesis, dynamic structure-directing agent, π-&pi, conjugation, Liebau’s rules

Minwei SUN, Heather K. HUNT, Christopher M. LEW, Rui CAI, Yan LIU, Yushan YAN. A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses[J]. 催化学报, 2012, 33(1): 85-91.

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A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses

A Dynamic Organic Structuring-Directing Agent for Pure-Silica-Zeolite AST and LTA Syntheses

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