The concentration CO2 gas has become a great worldwide challenge because CO2 is considered as an important counterpart of greenhouse gases. The tremendous increase in the concentration of CO2 gas, elevated the worldwide temperature as well as it altered the climatic changes. Various physiochemical approached have been reported to trap the CO2 gas and the chemical conversion of CO2 to useful chemicals is one of them. This review covers the conversion of CO2 gas to formic acid. In this CO2 hydrogenation reaction, both the homogeneous as well as heterogeneous catalytic systems were discussed along with the effect of solvent systems on reaction kinetics.
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