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采用快速氧化法、直接焙烧法、水热滴加法和水热倾倒法制备了纳米CeO_2催化剂,并用于催化甲醇与CO2合成碳酸二甲酯(DMC)。结果表明,水热滴加法制备的纳米CeO_2催化性能优于其他方法制备的催化剂。水热滴加法的最优条件为3 m L氨水和1.0 g CTAB,DMC产率最高可达0.772 0 mmol/mmolcat。此外,通过透射电镜(TEM)、X-射线衍射(XRD)、N2吸脱附、X-射线光电子能谱仪(XPS)和程序升温吸附(TPD)对所制备的催化剂进行表征。研究结果表明,纳米CeO_2上较高的Ce(Ⅳ)/Ce(Ⅲ)比值和适当的酸碱性位数量和强度对其催化性能有显著影响。
The nano-CeO 2 catalyst was prepared by a rapid oxidation method, a direct roasting method, a hydrothermal dropping method and a hydrothermal pouring method, and was used to catalyze the synthesis of dimethyl carbonate (DMC) from methanol and CO 2. The results show that the catalytic activity of nano-CeO 2 prepared by hydrothermal method is better than that prepared by other methods. The optimal conditions for the hydrothermal addition were 3 mL ammonia water and 1.0 g CTAB. The highest yield of DMC reached 0.772 mmol / mmol cat. In addition, the prepared catalyst was characterized by TEM, XRD, N2sorption, XPS and TPD. The results show that the higher Ce (Ⅳ) / Ce (Ⅲ) ratio and the proper number of acid-basic sites and strength on the nano-CeO 2 have a significant effect on the catalytic performance.