Hydrothermal reduction of CO2 captured as NaHCO3 into formate with metal reductants and catalysts

The hydrothermal reduction of CO2 captured in aqueous solutions using metal reductants is a promising novel approach that achieves high yields conversion and selectivity, but it presents the limitation temperatures needed for reaction to take place. In this work, experiments combining several reductant metals (Zn, Al Fe), catalysts (Pd/C, Ni, Cu, Fe2O3 Fe3O4) (200, 250 300 ºC) were performed optimize process at milder temperatures. Using as Pd/C catalyst, 38 % obtained 200ºC, compared with highest yield (57 %) observed ºC. Thus significant temperature can be achieved suitable combination catalyst. system, catalyst reductant, an extensive set different times order determine kinetics correlate them mathematical model process. correctly reproduces experimental data average errors lower than 5.9 %. These results demonstrate feasibility operating while maintaining performance, when adequate reductant.