Surface Acidity/Basicity and Oxygen Defects of Metal Oxide: Impacts on Catalytic Performances of CO2 Reforming and Hydrogenation Reactions

• Published in: Topics in catalysis Vol. 66; no. 5-8; pp. 299 - 325
• Main Authors: Gao, Xingyuan, Cai, Ping, Wang, Ziyi, Lv, Xiaomei, Kawi, Sibudjing
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2023; Springer Nature B.V
• Subjects: Acidity; Adsorption; Basicity; Carbon dioxide; Catalysis; Catalytic converters; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Coking; Conversion; Defects; Exhaust gases; Greenhouse gases; Hydrogenation; Industrial Chemistry/Chemical Engineering; Metal oxides; Original Paper; Oxygen; Pharmacy; Physical Chemistry; Reforming; Stability; Surface chemistry; Synthesis gas; Metal oxide; Oxygen defects; Reforming; CO; Basicity; Hydrogenation
• ISSN: 1022-5528; 1572-9028
• DOI: 10.1007/s11244-022-01708-0

CO 2 utilizations and conversions contribute to the reduction of greenhouse gas emissions and regeneration of industrial exhausts. Reforming and hydrogenation processes can transform CO 2 , hydrogen and hydrocarbons to syngas and other value-added products. To ensure a high activity, selectivity and stability as well as anti-coking property, efficient adsorption and activation of CO 2 exert a profound impact. Among the catalysts adopted in these reactions, metal oxides have been proven active for adsorbing and activating CO 2 based on surface acidity/basicity and oxygen defects. In this review, the impacts of these two physicochemical properties of metal oxides on the CO 2 adsorption and activation will be comprehensively and systematically summarized in terms of three performance criteria (CO 2 conversion—activity, product yield—selectivity, anti-coking property—stability) in two types of reactions relating to thermo-catalytic conversion of CO 2 (reforming and hydrogenation). In addition to the critical discussion of the structure-performance relationships, the reaction/deactivation mechanisms and origin of surface acidity/basicity and oxygen defects are also introduced in depth. Finally, conclusive remarks of the main contents and proposed future works are provided.