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Direct synthesis of dimethyl carbonate over rare earth oxide supported catalyst |
| JIANG Qi, CHENG Jiye, GAO Zhiqin |
| Guangdong Provincial Laboratory of Green Chemical Technology, School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China; |
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Abstract Solid base catalysts for the direct synthesis of dimethyl carbonate (DMC) from carbon dioxide, methanol, and propylene oxide were prepared by loading KCl and K2CO3 on the surface of La2O3, Y2O3, CeO2 and Nd2O3. The catalysts were characterized by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) techniques. The catalytic activities were efficiently influenced by the preparation conditions. The optimal loading amount of K2CO3 is 17.6% (mass) for KCl-K2CO3/Y2O3 and 22.2% for other catalysts. Supports affected the activity of catalyst. KCl-K2CO3/Nd2O3 exhibited the highest activity. The activity of KCl-K2CO3/Y2O3 increased with the increase of calcination temperature in the range of 800ºC–900ºC. The formation of KYO2, Y3O4Cl or YOX species probably promoted the catalysts.
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Issue Date: 05 September 2007
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