Origin of the optimum in catalytic activity of zeolite beta

Autor:	François Fajula, Fre′de′ric Vaudry, Francesco Di Renzo, Philippe Schulz
Rok vydání:	1998
Předmět:	Silanol chemistry.chemical_compound Tetraethylammonium Chemistry Aluminium Inorganic chemistry chemistry.chemical_element Thermal stability Physical and Theoretical Chemistry Zeolite Beta (finance) Catalysis
Zdroj:	Journal of the Chemical Society, Faraday Transactions. 94:617-621
ISSN:	1364-5455 0956-5000
DOI:	10.1039/a706509d
Popis:	Acidity and catalytic properties of zeolite beta depend on the stability of framework aluminium sites. Optimal performances are obtained with crystals of average radius 0.15–0.5 µm and an aluminium content m=Al/(Si+Al)=0.085. H-beta zeolites with such an aluminium content correspond to as-synthesized zeolites in which tetraethylammonium and aluminium contents are equal. Smaller crystals with higher aluminium contents are formed under synthesis conditions that generate tetrahedra distortions and silanol defects, with a significant decrease of the thermal stability.
Databáze:	OpenAIRE
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