Evaluation of zeolitic imidazolate frameworks as catalyst in hydrothermal reduction of CO2

Rise in atmospheric carbon dioxide concentration has intensified the global climate crisis that necessary to urgency attentions. In this research, Co:Mn-ZIF-4 and carbonized Co:Mn-ZIF-4 with various ratio of Co:Mn were synthesized by a simple one-step chemical method and characterized with XRD, BET TGA , EDX and Raman analysis. The catalytic activity of Co:Mn-ZIF-4 and carbonized Co:Mn-ZIF-4 were investigated for carbon dioxide reduction in hydrothermal conditions. The experimental results reveals that Co:Mn-ZIF-4 and carbonized Co:Mn-ZIF-4 had catalytic activity for carbon dioxide reduction for formic acid and acetic acid. The effect of reaction temperature and reaction time were evaluated for reaction yield. The obtained results reveal that Mn-ZIF-4 and carbonized Co:Mn-ZIF-4 (2:2) had the beast catalytic activity with respect others catalysts. The obtained results from various reaction temperature shows that the 250 °C was optimum temperature for reduction of carbon dioxide in hydrothermal conditions. Also the obtained results from various reaction time shows that the 3 h at 250 °C was optimum time for reduction of carbon dioxide in hydrothermal conditions. The maximum reaction yield for carbon dioxide reduction in hydrothermal conditions was obtained 28% for carbonized CO:Mn-ZIF-4 (2:2) at temperature 250 °C and 3 h.