Cycloaddition of CO2 to Epoxides Catalyzed by Carboxyl-Functionalized Imidazolium-Based Ionic Liquid Grafted onto Cross-Linked Polymer

详细信息    查看全文

• 作者：Yuanyuan Zhang ; Shuangfeng Yin ; Shenglian Luo ; Chak Tong Au
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：March 14, 2012
• 年：2012
• 卷：51
• 期：10
• 页码：3951-3957
• 全文大小：322K
• 年卷期：v.51,no.10(March 14, 2012)
• ISSN：1520-5045

文摘

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 掳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 Br酶nsted acid COOH, Lewis base Br^{鈥?/sup> and the support facilitates the coupling reaction. From the viewpoint of industrial application, the catalyst is attractive because of its excellent catalytic efficiency.}