Recent progress on Cu-based catalysts for reverse water gas shift reaction
Reverse water gas shift(RWGS)reaction,acting as a key step to convert carbon dioxide into chemicals or hydrocarbon,is of great significance for the utilization of carbon dioxide resources.In this paper,the thermodynamic analysis,reaction mechanism and the research progress of catalysts used in RWGS in recent ten years are reviewed.It is concluded that the Cu-based catalysts have the advantages of low-cost,high activity and high CO selectivity.However,Cu-based catalysts are easier to deactivate by coking and tend to sinter at high temperature,leading to a decrease of catalyst stability.At present,researchers are mainly focused on the aspects of regulation of Cu active centers and optimization of process conditions.In the aspect of regulation of Cu active center,it mainly includes:①modification of the structural characteristics of Cu sites,such as dispersion,particle size;②addition of promoters,including alkali metals(Na、K)and transition metals(Fe、Ce、Co);③introduction of proper support,such as Al2O3,Mo2C,CeO2 to enhance the metal-support interaction.In terms of optimization of process conditions,both CO selectivity and CO2 conversion can be enhanced by changing reaction temperature,pressure and adjusting H2/CO2 molar ratio in RWGS reaction.Finally,it is proposed that the coupling of CO2 with some important hydrogen production reactions such as light alkanes dehydrogenation,aromatization of methanol can achieve the purpose of increasing target products and reducing CO2 emission based on RWGS reaction.
catalyst engineeringreverse water gas shift reactionCu-based catalyststabilitydeactivation
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