Intrinsic Catalytic Cracking Activity of Hexane over H−ZSM-5, H−β and H−Y Zeolites

Autor:	Michael P. Rosynek, Stefan Kotrel, Jack H. Lunsford
Rok vydání:	1999
Předmět:	Chemistry Fluid catalytic cracking Surfaces Coatings and Films Catalysis Hexane chemistry.chemical_compound Cracking Adsorption Reaction rate constant Materials Chemistry Physical chemistry Gravimetric analysis Physical and Theoretical Chemistry ZSM-5
Zdroj:	The Journal of Physical Chemistry B. 103:818-824
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp982538l
Popis:	Mono- and bimolecular intrinsic rate constants for the conversion of n-hexane over H−Y, H−ZSM-5, and H−β zeolites were measured at 623 K by combining conventional catalytic techniques with gravimetric adsorption measurements. Since H-zeolites are catalytically active, their adsorption properties under reaction conditions could not be directly obtained. Rather, adsorption experiments were carried out on the H-zeolites at temperatures below the onset of catalytic activity (450−530 K). Thermodynamic adsorption constants for the H forms at 623 K were then obtained by extrapolation. In addition, the catalytically inactive Na forms were chosen to characterize the overall temperature dependence of n-hexane adsorption on ZSM-5, Y, and β zeolites in the range 450−623 K. For the cracking experiments, monomolecular conditions were ensured by choosing a low hexane pressure (
Databáze:	OpenAIRE
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