The Hydrothermal Synthesis of Zeolites: History and Development from the Earliest Days to the Present Time

Effects of hydrothermal aging on NH3-SCR reaction over Cu/zeolites

Characterization of nanocrystalline zeolite Beta

This article covers the recent development in the remarkably growing field of synthesis, characterization and particularly catalytic investigation of zeolite‐based materials combining micro‐ and mesoporous features. New synthetic approaches for preparation of micro/mesoporous composites including recrystallization of originally amorphous matter, utilization of nanocrystalline zeolite seeds and formation of mesoporous zeolite single crystals are the first focus of this article. The advantages and disadvantages of composite materials in comparison with pure micro‐ and mesoporous molecular sieves will be discussed, as well. The relevance of individual experimental techniques for analysis of the composites, i.e., their structure, porosity, chemical composition, morphological features, and so on, are described in the second section of the article. The last Section is focused on the application of micro/mesoporous composites and mesoporous zeolites as catalysts in acid‐catalyzed reactions, oxidation reactions a...

Perspectives of Micro/Mesoporous Composites in Catalysis

Using 27Al MAS and 27Al MQ MAS NMR, dealumination of zeolite H-Beta has been observed at specific T-positions in the framework. 27Al MQ MAS NMR is able to resolve aluminum in the T1 and T2 position...

Stepwise Dealumination of Zeolite Βeta at Specific T-Sites Observed with 27Al MAS and 27Al MQ MAS NMR

Study of the state of aluminium in zeolite-β

Boron and aluminium compete in the crystallization of zeolite beta. Aluminium incorporation is faster than boron incorporation. Non-linear effects of the B/Al ratio on the (B+Al)/Si ratio are observed. The particle size is affected by the composition of the synthesis gel, the bigger crystals being formed from highly boric gels.

Synthesis of Zeolite Beta in Boron-Aluminium Media

Tetraethylammonium permutites are XRD-amorphous silicoaluminates metastable towards the formation of several zeolites. They present a short-range organization around the organic agent, whose decomposition leaves a micropore system open. Their properties allow to consider the solids of this class as non-crystalline equivalents of the high-silica zeolites.

Pierre Espiau

Papers

Study of the state of aluminium in zeolite-β

Synthesis of Zeolite Beta in Boron-Aluminium Media

A microporous tetraethylammonium permutite as synthesis intermediate of the zeolite beta