Increase in the number of acid sites of a H-ZSM5 zeolite during the dehydration of ethanol

The activity of a H-ZSM5-90 for the dehydration of ethanol at 473 K increased with an increase in time on stream. The results of NH3-TPD and Ar adsorption showed that the number of acid sites of the H-ZSM5-90 increased during the dehydration. On the other hand, the activity and the number of acid si...

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Bibliographic Details
Published inCatalysis letters Vol. 113; no. 3-4; pp. 82 - 85
Main Authors TAKAHARA, Isao, SAITO, Masahiro, MATSUHASHI, Hiromi, INABA, Megumu, MURATA, Kazuhisa
Format Journal Article
LanguageEnglish
Published Dordrecht Springer 01.02.2007
Springer Nature B.V
Subjects
Acids
Ammonia
Catalysis
Chemistry
Dehydration
Ethanol
Ethylene
Exact sciences and technology
General and physical chemistry
Ion-exchange
Pretreatment
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Zeolites
Zeolites: preparations and properties
Heterogeneous catalysis
Ethanol
acid site
Acidic site
H-ZSM5
Alkanol
Alcohol
Zeolite
Dehydration
Molecular sieve
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Summary:The activity of a H-ZSM5-90 for the dehydration of ethanol at 473 K increased with an increase in time on stream. The results of NH3-TPD and Ar adsorption showed that the number of acid sites of the H-ZSM5-90 increased during the dehydration. On the other hand, the activity and the number of acid sites of H-mordenite-90 were almost unchanged during the dehydration. Since the pre-treatment of the H-ZSM5-90 with ethylene at 473 K largely increased its activity for the dehydration of ethanol, it is suggested that a large number of new acid sites could be formed inside the pores of H-ZSM5-90 via the polymerization of ethylene produced by the dehydration of ethanol.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-007-9025-9