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American Chemical Society, Chemistry of Materials, 9(20), p. 3218-3223, 2008

DOI: 10.1021/cm8002244

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Synthesis and Structure of Polymorph B of Zeolite Beta

Journal article published in 2008 by Avelino Corma, Manuel Moliner, Ángel Cantín, María J. Díaz Cabañas, José L. Jordá ORCID, Daliang Zhang, Junliang Sun, Kjell Jansson, Sven Hovmöller, Xiaodong Zou
This paper is available in a repository.
This paper is available in a repository.

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Abstract

It was found that either polymorph B or polymorph C of zeolite beta can be obtained from the same structure directing agent: 4,4-dimethyl-4-azonia-tricyclo[5.2.2.02,6]undec-8-ene hydroxide. The synthesis occurs through a consecutive process where polymorph B is first formed and then transformed into polymorph C. It is possible to produce a zeolite highly enriched in polymorph B, provided that the transformation of this phase into polymorph C is slowed down up to the point where polymorph C is only detected at trace levels. The structure of polymorph B was determined for the first time by electron crystallography with SAED and HRTEM from areas of unfaulted polymorph B crystals.