Possible catalytic activity of different metals in hydrothermal reduction of CO2 into formic acid with Zn was investigated under low temperatures. Among the several catalysts (Cu, Fe and Sn) were used, Cu shows the best catalytic activity for the formic acid production. The formic acid yield is as high as 61% under hydrothermal condition. XRD analysis was also carried out to investigate the possible role of reactants.
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