1-Pentene isomerization over zeolites studied by in situ IR spectroscopy

The skeletal isomerization of 1-pentene at 1.2 bar total pressure and 30 mbar 1-pentene partial pressure was investigated by in situ IR measurements over FER and BEA zeolites. If the reaction was carried out isothermally a small loss of Brønsted acid sites due to coke formation, a constant conversio...

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Bibliographic Details
Published in:Catalysis letters 2003, Vol.85 (1-2), p.117-122
Main Authors: FÖTTINGER, K, KINGER, G, VINEK, H
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Coke
Conversion
Dimerization
Exact sciences and technology
General and physical chemistry
Infrared spectroscopy
Isomerization
Partial pressure
Pore size
Porosity
Selectivity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Zeolites
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Summary:The skeletal isomerization of 1-pentene at 1.2 bar total pressure and 30 mbar 1-pentene partial pressure was investigated by in situ IR measurements over FER and BEA zeolites. If the reaction was carried out isothermally a small loss of Brønsted acid sites due to coke formation, a constant conversion and a high selectivity to isopentenes was found over FER. A loss of acid sites and a decrease in conversion was found over BEA, but the selectivity to isomerization increased remarkably. The pore size of FER favored the monomolecular reaction of 1-pentene and suppressed bimolecular reactions. In the bigger pores of BEA initially dimerization–cracking and hydrogen transfer reactions leading to a coke layer took place then the skeletal isomerization of 1-pentene prevailed.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1022137328316