Ruthenium complex immobilized on supported ionic-liquid-phase (SILP) for alkoxycarbonylation of olefins with CO2

In this study, the heterogeneously catalized alkoxycarbonylation of olefins with CO2 based on the SILP strategy was reported for the first time. The catalyst Ru@SILP was accessed by immobilization of ruthenium complex on the SILP, wherein imidazolium chlorides were chemically integrated at the surface or channel of silica gel support. The active Ru site was generated through reacting Ru3(CO)12 with the decorated imidazolium chlorides in a proper microenviroment. Different IL film by varying the functionality of the side chain at the imidazolium cation strongly affects the porosity, active Ru sites, and CO2 adsorption capacity of Ru@SILP, thereby considerably influencing its catalytic performance. The optimized Ru@SILP-A-2 displayed enhanced catalytic performance and prominent substrate selectivity compared to the independent homogeneous system under identical conditions. These findings provide the basis for novel design concept for achieving both efficient and stable catalysts in the coupling CO2 with olefins.

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