Why are transition metals preferred to noble metals in co2 conversion process?
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Transition metals are preferred over noble metals in CO2 conversion processes due to their higher reactivity and selectivity. Noble metals, such as platinum (Pt), palladium (Pd), and gold (Au), have been extensively studied as catalysts for CO2 conversion . However, their reactivity and selectivity in CO2 conversion reactions are relatively low, mainly due to the competing hydrogen evolution reaction (HER) . On the other hand, transition metals, such as silver (Ag) and pyridine catalysts, have shown enhanced CO2 conversion and higher activity compared to noble metals . The interaction between transition metal carbides (TMCs) and nitrides (TMNs) and CO2RR intermediates enables dual-site functionalization of catalysts, which enhances CO2RR and suppresses HER . Additionally, transition metal complexes in solution offer the possibility to act as catalysts for CO2 electrochemical reduction, allowing for more elaborate transformations within the coordination sphere of the metal center . Therefore, transition metals are preferred in CO2 conversion processes due to their improved reactivity, selectivity, and potential for more diverse product formation.
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