The dynamics of ammonia sorption and n-octane hydroconversion over dealuminated ZSM-5 zeolites

The dynamics of NH3 sorption of H-ZSM-5 zeolites dealuminated by steaming was examined using the frequency response (FR) method. Two sorption processes with different rates were distinguished: a slower process (process i), related to the formation of NH4+ ions on the Brönsted acid sites, and a faste...

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Bibliographic Details
Published inSolid state ionics Vol. 141-142; pp. 123 - 128
Main Authors Onyestyák, G, Valyon, J, Rees, L.V.C
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2001
Subjects
Dynamics of NH3 sorption
Frequency response method
Octane hydroconversion
Dealuminated H-ZSM-5
Ammonia
Frequency response method
n-octane
Dynamics of NH3 sorption
Octane hydroconversion
Pt/H-ZSM-5
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Summary:The dynamics of NH3 sorption of H-ZSM-5 zeolites dealuminated by steaming was examined using the frequency response (FR) method. Two sorption processes with different rates were distinguished: a slower process (process i), related to the formation of NH4+ ions on the Brönsted acid sites, and a faster process (process j) assigned to sorption on Lewis acid sites, which were predominantly, on the NH4+ ions. The ZSM-5 preparations were used as acid supports of Pt-containing bifunctional catalysts that were tested in the hydroconversion of n-octane. Correlations were established between the rate constant of NH3 adsorption (ka(j)) and desorption (kd(j)) and the site-specific hydroconversion activity.
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ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(01)00731-7