Recent developments of MOF-supported metal catalysts for CO2 hydrogenation
Since the industrial age,the massive use of fossil fuels has intensified the emission of greenhouse gases such as carbon dioxide,which has caused irreversible damage to the ecological environment.With rapid increase of green hydrogen obtained from renewable energy sources,catalytic hydrogenation of carbon dioxide to produce high value-added chemicals such as methanol,formic acid and methane has gradually become one of the most promising methods for carbon dioxide conversion.The properties of support materials play an important role in regulating the performance of metal catalysts for carbon dioxide-catalytic hydrogenation.On the other hand,metal-organic frameworks(MOFs)have the unique properties of large specific surface area,high porosity,and designable structure(both metal centers and organic ligands are easy to be functionalized),and have gradually become the rising support materials for catalytic carbon dioxide hydrogenation metal catalysts.In this paper,the catalytic properties and performance of MOF-supported mono-metal and metal-alloy catalysts are revealed through the reaction processes of different hydrogenation products(methanol,formic acid,methane),and the interaction between support and metal active substance and its influence on the reaction properties are summarized.A variety of regulatory methods for MOFs supported metal materials,including selective anchoring,encapsulation,size adjustment,ligand optimization,were discussed in detail,and the practical application and performance of these methods are revealed.The unique properties and superior activity of MOFs in hydrogenation reaction are disclosed through a comparison with the conventional homogeneous and heterogeneous hydrogenation catalysts.According to the literature reports,the general principles of rational design of high performance MOF-based metal catalysts are put forward,and the theoretical description of reaction mechanisms of different products is given.In summary,this paper provides a feasible path for improving the performance of carbon dioxide catalytic hydrogenation catalysts,and a strong support for further expanding the application scope of MOF-based materials.
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