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Secondary Cation Effects On Sodium And Potassium Zeolite Syntheses at Si/Al2 = 9: Part 1- Phase Development in the Sodium System

Published online by Cambridge University Press:  28 February 2011

David E. W. Vaughan
David E. W. Vaughan*
Affiliation:
Exxon Research and Engineering Company, Route 22 East, Annandale, N.J., U.S.A., 08801
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Abstract

The influence of Group 1A elements, and various alkyl ammonium cations, on a metastable faujasite synthesis at a silica/ alumina ratio of 9 are reported. Co-crystallization of faujasite, gmelinite and gismondine (P) occurs in reactions with Li+, K+ and Rb+, but the trapping of Cs+ in the FAU sodalite cage (CSZ-1/ CSZ-3) inhibits subsequent reactions to GIS, and blocks the formation of GME. Morphological effects of these cations include platelet formation and the promotion of small crystals. TMA addition promotes mazzite analogues; and DEDM stabilizes FAU, and at 140°C., induces the crystallization of ECR-1. The derivation of all these phases from a restricted number of secondary building units is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 111: Symposium O – Microstructure and Properties of Catalysts , 1987 , 89
Copyright
Copyright © Materials Research Society 1988

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