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Updated: Feb 11, 2026

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane
Published on: February 22, 2020
Pure Polymorph C of Zeolite Beta Synthesized by Using Framework Isomorphous Substitution as a Structure-Directing
Avelino Corma1, Marie T Navarro1, Fernando Rey1
1Instituto de Tecnología Química UPV-CSIC Universidad Politécnica de Valencia Avda. de los Naranjos, s/n, 46022, Valencia (Spain) Fax: (+34) 96-3877809.
Abstract:
Subsitution of germanium for silicon in the preparation of the zeolite Beta allows the synthesis and characterization of a third, heretofore predicted, polymorph "C"; a [001] view is shown in the picture. Germanium preferentially occupies positions in double four-membered ring cages, the secondary building units of polymorph C, and favors the formation of polymorph C regardless of which of the eight organic structure-directing agents were used.
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