CO_(2)和甲醇直接合成碳酸二甲酯用CeO_(2)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

CO_(2)是主要的温室气体,也是一种廉价丰富、未能广泛应用的碳资源。CO_(2)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CO_(2)化学惰性的影响,CO_(2)转化率和DMC收率较低。CeO_(2)基催化剂是CO_(2)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。该文重点介绍了CO_(2)和甲醇直接合成DMC反应热力学、在CeO_(2)基催化剂上反应机理及CeO_(2)基催化剂的研究进展,详细介绍了CeO_(2)基催化剂的形貌和表面性质的调控方法及其耦合的高效脱水剂,并指出未来可在制备比表面积大和活性位浓度高的CeO_(2)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。

CO_(2) is a major greenhouse gas,also an abundant,cheap and unwidely used carbon resource.The direct production of dimethyl carbonate(DMC)from CO_(2) and methanol is of great significance in the context of"dual carbon goals".However,the CO_(2) conversion and DMC yield are too low due to the reaction thermodynamic limitations and CO_(2) inertness.CeO_(2)-based catalysts exhibit good performance in the direct synthesis of DMC from CO_(2) and methanol.In this review,the thermodynamics of direct DMC synthesis from CO_(2) and methanol,and the reaction mechanism as well as the research progress on CeO_(2)-based catalysts were mainly introduced.The morphology regulation method,the surface properties of CeO_(2)-based catalysts,and its coupling with high-efficiency dehydrating agents were then summarized in detail.Finally,it was suggested that future research should be focused on the preparation of CeO_(2)-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.