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Title: On the role of small amines in zeolite synthesis

Abstract

A crystallization study was undertaken to relate the structure of small amines to the zeolite product obtained. At SiO{sub 2}/Al{sub 2}O{sub 3} = 200, certain noncyclic amines (some not previously recognized) were specific for the formation of 10-ring zeolites, e.g., ZSM-22 and ZSM-23. For example, ethylmethylamine and diethylamine yielded highly crystalline ZSM-22, while ethylamine and isopropylamine yielded ZSM-12. At lower SiO{sub 2}/Al{sub 2}O{sub 3} ratios (40), a different set of zeolites was obtained, as expected, ZSM-35 and MCM-22. Again, a specific relationship was observed between the amine employed and the zeolite obtained. In both SiO{sub 2}/Al{sub 2}O{sub 3} regimes, several amines played non-structure-specific pore- and pH-stabilizing roles and yielded ZSM-5. With relatively few exceptions, the zeolite products were fully porefilled with amine and low in Na (Na/Al < 1). Computer simulations confirmed a pore-stabilizing role for both structure-specific and non-structure-specific amines. At the same time, among structure-specific (structure-directing) amines, they showed that the interaction energy differences between alternative amine-pore combinations were often quite small (0.5--2.0 kcal/mol, for example). Nevertheless, the changes in amine-pore interaction energies for this group of amines consistently tracked the changes in zeolite products observed.

Authors:
; ; ; ;  [1];  [2]
  1. Mobil Technology Co., Paulsboro, NJ (United States). Strategic Research Center
  2. Univ. of Delaware, Newark, DE (United States). Dept. of Chemistry and Biochemistry
Publication Date:
OSTI Identifier:
696649
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
Additional Journal Information:
Journal Volume: 103; Journal Issue: 34; Other Information: PBD: 26 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMINES; ZEOLITES; CRYSTAL STRUCTURE; ALKYL RADICALS; PIPERAZINES; CRYSTALLIZATION

Citation Formats

Rollmann, L.D., Schlenker, J.L., Lawton, S.L., Kennedy, C.L., Kennedy, G.J., and Doren, D.J. On the role of small amines in zeolite synthesis. United States: N. p., 1999. Web. doi:10.1021/jp991913m.
Rollmann, L.D., Schlenker, J.L., Lawton, S.L., Kennedy, C.L., Kennedy, G.J., & Doren, D.J. On the role of small amines in zeolite synthesis. United States. doi:10.1021/jp991913m.
Rollmann, L.D., Schlenker, J.L., Lawton, S.L., Kennedy, C.L., Kennedy, G.J., and Doren, D.J. Thu . "On the role of small amines in zeolite synthesis". United States. doi:10.1021/jp991913m.
@article{osti_696649,
title = {On the role of small amines in zeolite synthesis},
author = {Rollmann, L.D. and Schlenker, J.L. and Lawton, S.L. and Kennedy, C.L. and Kennedy, G.J. and Doren, D.J.},
abstractNote = {A crystallization study was undertaken to relate the structure of small amines to the zeolite product obtained. At SiO{sub 2}/Al{sub 2}O{sub 3} = 200, certain noncyclic amines (some not previously recognized) were specific for the formation of 10-ring zeolites, e.g., ZSM-22 and ZSM-23. For example, ethylmethylamine and diethylamine yielded highly crystalline ZSM-22, while ethylamine and isopropylamine yielded ZSM-12. At lower SiO{sub 2}/Al{sub 2}O{sub 3} ratios (40), a different set of zeolites was obtained, as expected, ZSM-35 and MCM-22. Again, a specific relationship was observed between the amine employed and the zeolite obtained. In both SiO{sub 2}/Al{sub 2}O{sub 3} regimes, several amines played non-structure-specific pore- and pH-stabilizing roles and yielded ZSM-5. With relatively few exceptions, the zeolite products were fully porefilled with amine and low in Na (Na/Al < 1). Computer simulations confirmed a pore-stabilizing role for both structure-specific and non-structure-specific amines. At the same time, among structure-specific (structure-directing) amines, they showed that the interaction energy differences between alternative amine-pore combinations were often quite small (0.5--2.0 kcal/mol, for example). Nevertheless, the changes in amine-pore interaction energies for this group of amines consistently tracked the changes in zeolite products observed.},
doi = {10.1021/jp991913m},
journal = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},
number = 34,
volume = 103,
place = {United States},
year = {1999},
month = {8}
}