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以柠檬酸为络合剂,制备掺杂不同金属的铈基固溶体。XRD表征表明成功合成了铈基固溶体。甲醇和二氧化碳直接合成碳酸二甲酯活性测试结果表明,掺杂镧的固溶体具有较好的活性,加入锌的固溶体活性最差。对掺杂不同金属的铈基固溶体的NH_3-TPD和CO_2-TPD表征表明,中强酸碱位和强酸碱位是催化剂的活性中心。具有较多中强酸碱位和强酸碱位的铈镧固溶体表现出最好的活性。
Using citric acid as a complexing agent, a cerium-based solid solution doped with different metals was prepared. XRD characterization demonstrated the successful synthesis of cerium-based solid solution. The results of direct synthesis of dimethyl carbonate from methanol and carbon dioxide showed that the solid solution doped with lanthanum had better activity and the solid solution with zinc added had the poorest activity. The characterization of NH 3 -TPD and CO 2 -TPD of cerium-based solid solution doped with different metals showed that the strong base and the strong base were the active centers of the catalysts. The cerium-lanthanum solid solution with more moderately strong acid base and strong acid base shows the best activity.