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Are carbenium and carbonium ions reaction intermediates in zeolite-catalyzed reactions?

Paper ID Volume ID Publish Year Pages File Format Full-Text
43396 45968 2008 9 PDF Available
Title
Are carbenium and carbonium ions reaction intermediates in zeolite-catalyzed reactions?
Abstract

The mechanism of acid-catalyzed hydrocarbon reactions such as skeletal isomerization, hydride transfer, alkylation, dehydrogenation and cracking in superacid media and over solid zeolites is analyzed and compared. In particular, the stability, rearrangements and nature (reaction intermediates or transition states) of trivalent carbenium ions and non-classical pentacoordinated carbonium ions in homogeneous and heterogeneous phase are discussed. It is concluded that both carbenium and carbonium ions may exist as true reaction intermediates in zeolite-catalyzed processes only when the positive charge is not easily accessible to framework oxygen atoms.

Graphical abstractThe mechanism of acid-catalyzed hydrocarbon reactions such as skeletal isomerization, hydride transfer, alkylation, dehydrogenation and cracking in superacid media and over solid zeolites is analyzed and compared. In particular, the stability, rearrangements and nature (reaction intermediates or transition states) of trivalent carbenium ions and non-classical pentacoordinated carbonium ions in homogeneous and heterogeneous phase are discussed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Zeolites; Carbocations; Acid catalysis; DFT
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Are carbenium and carbonium ions reaction intermediates in zeolite-catalyzed reactions?
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 336, Issues 1–2, 1 March 2008, Pages 2–10
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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Full-text PDF Download
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