Role of doping concentration on the RWGS performance of Cu doped CeO2 catalysts

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Abstract
The reverse water-gas shift (RWGS) reaction efficiently transforms CO2 into CO at high temperatures, ensuring high CO selectivity while preventing the formation of methane as a byproduct. Nanocrystalline ceria-based materials are synthesised by using a modified co-precipitation method. This method utilizes the molecular water in the precursor materials to aid the hydroxylation process, which helps minimize the risk of agglomeration resulting from hydrogen bonding. The as prepared catalysts were calcined at high temperature to get the crystalline materials. The freshly synthesized and calcined catalysts were analysed using various characterisation techniques such as X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and X-ray photoelectron spectroscopy (XPS). The results suggest that enhancing the copper concentration in Cu-doped CeO2 significantly improves its catalytic activity at low and moderate temperatures. Among all the catalysts 25 mol % copper doped CeO2 gives extraordinary activity for RWGS reaction having CO2 conversion of ~ 50% at 800 ˚C.

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