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Transformation of thiophenic compounds over acidic zeolites

Paper ID Volume ID Publish Year Pages File Format Full-Text
43867 45992 2006 12 PDF Available
Title
Transformation of thiophenic compounds over acidic zeolites
Abstract

The transformation of thiophenic compounds (2-methylthiophene; 3-methylthiophene; 2,3-dimethylthiophene; 2,5-dimethylthiophene; 2-methylbenzothiophene; 3-methylbenzothiophene) was carried out over HY zeolite at 350 °C under atmospheric pressure in a fixed bed reactor. The transformation of some of them was also carried out over Hβ, HZSM5 and H-mordenite (HMOR). In the presence of HY, all the reactants underwent both isomerization and disproportionation in various proportions depending on their structure. HZSM5 catalyzed isomerization only and disproportionation was also very limited compared to isomerization with Hβ and with HMOR. HMOR deactivated so rapidly that it was not possible to measure its activity accurately. Isomerization occurred essentially through an acid-catalyzed step by step intramolecular mechanism. The disproportionation product distribution was explained on the basis of the relative stabilities of the intermediates involved in the reaction. As expected, disproportionation was more sensitive to catalyst deactivation than isomerization.

Keywords
Zeolites HY; Hβ; HZSM5; HMOR; Methylthiophenes; Methylbenzothiophenes; Dimethylthiophenes; Isomerization; Disproportionation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 305, Issue 1, 17 May 2006, Pages 90–101
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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