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Activated carbon as a catalyst for the synthesis of N-alkylimidazoles and imidazolium ionic liquids

Paper ID Volume ID Publish Year Pages File Format Full-Text
55388 47050 2012 7 PDF Available
Title
Activated carbon as a catalyst for the synthesis of N-alkylimidazoles and imidazolium ionic liquids
Abstract

An activated carbon Norit RX3 has been treated with acids (sulphuric, nitric and sulphonitric mixture). The modified activated carbons have been characterized by elemental analysis, point of zero charge, N2 adsorption, XPS and FTIR. The solids obtained have been used as acidic heterogeneous catalyst in the reaction between imidazole and haloalkanes. The reaction with 1-bromobutane yields an ionic liquid, N,N-di-n-butyl-imidazolium bromide (1). Reaction with 2-bromobutane and 1-chlorohexane yields the corresponding N-alkyl-imidazoles (2) and (3). Sulphuric acid treated carbon is the most active catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (61 K)Download as PowerPoint slideHighlights► Activated carbon with mineral acid yields an acidic heterogeneous catalyst. ► The acidity of the activated carbons is due to modification of functional groups. ► N-alkylation of imidazole can be catalysed by acids. ► Ionic liquids or N-alkylimidazoles are obtained in this reaction, depending on haloalkane. ► Sulphuric acid treated carbon is the most active catalyst.

Keywords
Activated carbon; N-heterocycles alkylation; Ionic liquid; Catalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 187, Issue 1, 30 June 2012, Pages 108–114
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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