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In this paper, a novel arginine-glucose derived carbonaceous-material-loaded SiO2 composite catalyst (Ar-G-CM/SiO2) was synthesized from non-toxic and harmless reagents (arginine, glucose and tetraethylorthosilicate) by simple hydrothermal process. Mesoporous SiO2 with high specific area served as support for carbonaceous material and provided extra hydrogen bond donor (HBD) groups. Ar-G-CM/SiO2 with acid-base dual functional groups (-COOH, -NH2) and HBD group (-OH) presented 62% yield and 99% selectivity to product of propylene carbonate in CO2 cycloaddition reaction with propylene oxide even at 40 oC, 2 MPa under metal-absent and solvent-free conditions. For some less active epoxides with steric hindrance, Ar-G-CM/SiO2 also showed good yield and selectivity over 90% by raising temperature to 120 oC. Furthermore, the Ar-G-CM/SiO2 catalyst could be reused for six successive cycles without significant decrease in catalytic activity or structural deterioration, because the carbon deposition was restrained owing to the mesoporous structure of the catalyst. |
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