Future work may focus on the reacti

Future work may focus on the reaction mechanism of catalysts in a RWGS reaction. The reaction mechanism and even active sites have been strongly debated, and these aspects are essential for the rational design of highly efficient and selective RWGS catalysts. With the development of in situ and operando spectroscopy technologies, such as in situ XPS and in situ XRD, as well as the capability of DFT calculations, the reaction mechanism on various catalysts operating under various reaction conditions may be clarified in the future. With better understanding on the reaction mechanism and structure-activity/selectivity relationship, more efficient catalysts may be designed in the future.