TY - JOUR
T1 - Basic zeolites as catalysts in the N-alkylation of imidazole: Activation by microwave irradiation
AU - Costarrosa, L.
AU - Ruiz-Martínez, J.
AU - Rios, R. V.R.A.
AU - Silvestre-Albero, J.
AU - Rojas-Cervantes, M. L.
AU - Sepúlveda-Escribano, A.
N1 - Generated from Scopus record by KAUST IRTS on 2019-08-08
PY - 2009/4/1
Y1 - 2009/4/1
N2 - 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 N2 (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. © 2008 Elsevier Inc. All rights reserved.
AB - 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 N2 (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. © 2008 Elsevier Inc. All rights reserved.
UR - https://linkinghub.elsevier.com/retrieve/pii/S1387181108004095
U2 - 10.1016/j.micromeso.2008.07.046
DO - 10.1016/j.micromeso.2008.07.046
M3 - Article
SN - 1387-1811
VL - 120
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-2
ER -