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

C. J. Durán-Valle, M. Madrigal-Martínez, M. Martínez-Gallego, I. M. Fonseca, I. Matos, A. M. Botelho Do Rego

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

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, N 2 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.

Original languageEnglish
Pages (from-to)108-114
Number of pages7
JournalCatalysis Today
Volume187
Issue number1
DOIs
Publication statusPublished - 30 Jun 2012

Keywords

  • Activated carbon
  • Catalysis
  • Ionic liquid
  • N-heterocycles alkylation

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