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Cycloaddition of CO2 to epoxides catalyzed by carboxyl - functionalized imidazolium - based ionic liquid grafted onto cross - linked polymer / Yuanyuan Zhang in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3951–3957 Titre : Cycloaddition of CO2 to epoxides catalyzed by carboxyl - functionalized imidazolium - based ionic liquid grafted onto cross - linked polymer Type de document : texte imprimé Auteurs : Yuanyuan Zhang, Auteur ; Shuangfeng Yin, Auteur ; Shenglian Luo, Auteur Année de publication : 2012 Article en page(s) : pp. 3951–3957 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carboxyl  Ionic  Liquid  Polymer Résumé : Carboxyl-functionalized imidazolium-based ionic liquid was grafted onto cross-linked divinylbenzene polymer (PDVB-CEIMBr) for the first time. The catalyst was characterized and used for the cycloaddition of CO2 to epoxides under relatively mild reaction conditions without any use of cocatalyst and organic solvent. The effects of reaction conditions (temperature, initial CO2 pressure, and time) and water addition on the yield of cyclic carbonate were investigated systematically. Under optimal conditions (140 °C, initial CO2 pressure 2.0 MPa and 4 h), propylene carbonate selectivity and yield was 99.8% and 96.1%, respectively. Moreover, the catalyst shows good stability and reusability. A plausible reaction mechanism was proposed for the catalytic reaction. It is suggested that synergetic effect among Brønsted acid COOH, Lewis base Br– and the support facilitates the coupling reaction. From the viewpoint of industrial application, the catalyst is attractive because of its excellent catalytic efficiency. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie203001u [article] Cycloaddition of CO2 to epoxides catalyzed by carboxyl - functionalized imidazolium - based ionic liquid grafted onto cross - linked polymer [texte imprimé] / Yuanyuan Zhang, Auteur ; Shuangfeng Yin, Auteur ; Shenglian Luo, Auteur . - 2012 . - pp. 3951–3957. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3951–3957 Mots-clés : Carboxyl  Ionic  Liquid  Polymer Résumé : Carboxyl-functionalized imidazolium-based ionic liquid was grafted onto cross-linked divinylbenzene polymer (PDVB-CEIMBr) for the first time. The catalyst was characterized and used for the cycloaddition of CO2 to epoxides under relatively mild reaction conditions without any use of cocatalyst and organic solvent. The effects of reaction conditions (temperature, initial CO2 pressure, and time) and water addition on the yield of cyclic carbonate were investigated systematically. Under optimal conditions (140 °C, initial CO2 pressure 2.0 MPa and 4 h), propylene carbonate selectivity and yield was 99.8% and 96.1%, respectively. Moreover, the catalyst shows good stability and reusability. A plausible reaction mechanism was proposed for the catalytic reaction. It is suggested that synergetic effect among Brønsted acid COOH, Lewis base Br– and the support facilitates the coupling reaction. From the viewpoint of industrial application, the catalyst is attractive because of its excellent catalytic efficiency. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie203001u