Basic zeolites as catalysts in the N-alkylation of imidazole: Activation by microwave irradiation

被引：4

作者：

Costarrosa, L. ^{[2
]}

Ruiz-Martinez, J. ^{[1
]}

Rios, R. V. R. A. ^{[1
]}

Silvestre-Albero, J. ^{[1
]}

Rojas-Cervantes, M. L. ^{[2
]}

Sepulveda-Escribano, A. ^{[1
]}

机构：

[1] Univ Alicante, Dept Quim Inorgan, E-03080 Alicante, Spain

[2] Univ Nacl Educ Distancia, Dept Quim Inorgan & Quim Tecn, Madrid 28040, Spain

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2009年 / 120卷 / 1-2期

关键词：

Basic zeolites; Cation exchange; Immersion calorimetry; N-alkyl imidazoles; SOLID-BASE; ADSORPTION; ALKALI; MICROCALORIMETRY; ISOMERIZATION; CONDENSATION; CLAYS;

D O I：

10.1016/j.micromeso.2008.07.046

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The alkylation of imidazole (C3H4N2) with different alkyl halides, such as 1-Br-butane, 2-Br-butane and 1-Br-hexane, has been carried out in the absence of solvent using basic zeolites as catalysts. Catalysts were prepared by cation exchange of a commercial NaX zeolite with different alkaline-earth cations (Ca, Sr and Ba). The resulting zeolites were characterised by N-2 (77 K) and CO2 (273 K) adsorption, immersion calorimetry, CO2 adsorption calorimetry and CO2 temperature-programmed desorption experiments. The influence of the irradiation time and power and the alkaline-earth exchanged cation on the catalytic activity has been studied. Conversion values as high as 95% and selectivity values of 100% were obtained at 700 W in only 5 min in most of the cases when 1-Br-butane and 2-Br-butane were used as alkylating agents. In general, NaX is the best catalyst in most of the reaction conditions studied. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：115 / 121

页数：7

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