CO2和甲醇直接合成碳酸二甲酯用CeO2基催化剂的研究进展

Research progress of CeO2-based catalysts for direct synthesis of dimethyl carbonate from CO2 and methanol

摘要:

CO2是主要的温室气体，同时也是一种丰富廉价、未能广泛应用的碳资源。CO2和甲醇直接合成高附加值的碳酸二甲酯（DMC）在“双碳”背景下具有重要的研究价值，但因反应热力学的限制和CO2化学惰性影响，CO2转化率和DMC收率较低。CeO2基催化剂是CO2和甲醇直接合成DMC反应报道较多且性能较好的一类催化剂。该综述重点介绍了CO2和甲醇直接合成DMC反应热力学和CeO2基催化剂上反应机理及催化剂研究进展，详细介绍了CeO2基催化剂的形貌和表面性质的调控方法及其耦和的高效脱水剂，并指出未来可在制备比表面积大、活性位浓度高的CeO2基催化剂、催化剂氧缺位含量的原位表征及开发新型廉价高效的脱水剂等方面开展工作。

Abstract:

CO2 is a major greenhouse gas, but also an abundant, cheap and not widely used carbon resource. The direct production of dimethyl carbonate (DMC) from CO2 and methanol is of great significance in the context of “dual carbon goals”. However, the CO2 conversion and DMC yield are too low due to the reaction thermodynamic limitations and inertness of CO2. CeO2-based catalyst is a kind of catalyst with good performance in the direct synthesis of DMC from CO2 and methanol, which has been extensively reported in literature. Therefore, this review focuses on the thermodynamics of the direct synthesis of DMC from CO2 and methanol and the research progress of the reaction mechanism and catalyst studies over CeO2-based catalysts. It also details the methods for controlling the morphology and surface properties of CeO2-based catalysts and the coupling of high-efficiency dehydration agents. It also points out that future work can be carried out in the preparation of CeO2-based catalysts with high specific surface area and high concentration of active sites, in-situ characterization of oxygen vacancy concentration, and the development of new inexpensive and efficient dehydration agents.