Carbon monoxide conversion via ionic liquids intensification
Carbon monoxide(CO)is not only harmful to human health but also detrimental to catalysts in proton-exchange-membrane fuel cells as an impurity gas in H2,which is generated simultaneously by steam reforming of natural gas/coal gasification.On the other hand,pure CO is a resource and can be transferred to value-added chemicals.Therefore,CO capture and conversion is an important and sustainable process.Recently,ionic liquids(ILs)have been widely used in the field of gas capture and conversion due to their unique properties,including low vapor pressure,high thermal and chemical stability,high solubility,and tunable structure and properties.Firstly,ILs serve as good reaction media to promote the complete reaction of CO reaction systems.Secondly,ILs,especially functional IL-based green solvents,serve as efficient absorbents to promote the conversion of CO.Thirdly,functional ILs serve as catalysts for catalytic conversion of CO.Therefore,the research progress of ILs,IL-based mixed solvents and IL-based hybrid materials to enhance CO conversion in recent years was reviewed from the aspects of IL-based reaction media,absorbents and catalysts.IL-enhanced CO conversion reactions include acylation,esterification,cycloaddition,olefin addition,polymerization,etc.The structure of ILs was systematically summarized,and the mechanism and influencing factors in CO conversion were analyzed.Finally,the problems and future trends in the CO conversion via ILs intensification were proposed.
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维普
