Post-Synthesis Treatment gives Highly Stable Siliceous Zeolites through the Isomorphous Substitution of Silicon for Germanium in Germanosilicates

Germanosilicates, an important family of zeolites with increasing number of members and attractive porosities, but containing a large quantity of unstable Ge atoms in the framework, meet with great obstacles in terms of limited thermal and hydrothermal stability when it comes to practical use. A fac...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2014-01, Vol.53 (5), p.1355-1359
Main Authors: Xu, Hao, Jiang, Jin-gang, Yang, Boting, Zhang, Lin, He, Mingyuan, Wu, Peng
Format: Article
Language:English
Subjects:
acid treatment
Atomic properties
Crystal structure
double 4-ring
Germanium
Porosity
post-synthesis treatment
Silicon
Stability
Stabilization
Zeolites
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Summary:Germanosilicates, an important family of zeolites with increasing number of members and attractive porosities, but containing a large quantity of unstable Ge atoms in the framework, meet with great obstacles in terms of limited thermal and hydrothermal stability when it comes to practical use. A facile stabilization method thus has been developed to substitute isomorphously Ge atoms for Si atoms, giving rise to ultrastable siliceous analogues of the pristine germanosilicates. A straight swap: The pores and crystalline structures of germanosilicates can be stabilized by treating as‐synthesized samples under acidic conditions. The resulting substitution of Ge by Si gives highly siliceous zeolites, analogous to the germanosilicates, but highly stable against harsh acid treatment and calcination.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201306527