A new study introduces a simplified method to produce molybdenum carbide catalysts that show excellent activity and stability in carbon dioxide conversion.
The method avoids complex traditional processes and provides a new carbon cycle pathway for improved efficiency, with potential for broad industrial applications.
Researchers create highly efficient molybdenum carbide catalyst
Molybdenum Carbide Catalysts
Molybdenum (Mo) carbides are known for their unique electronic and structural properties and are considered promising alternatives to precious metal catalysts in heterogeneous catalysis. However, traditional methods for preparing molybdenum carbide are complex processes, strict synthesis conditions, difficult crystal regulation, and high energy consumption. In addition, Mo carbides are easily oxidized and deactivated, which poses a major obstacle to their widespread application.
In a study published in Nature Chemistry on September 9, a research team from DICP in China developed a simple strategy to establish molybdenum carbide catalysts for efficient carbon dioxide conversion, bypassing the complex carbonization process in traditional methods.
Novel Catalyst Preparation Method
The researchers used a one-step flame spray pyrolysis (FSP) method to prepare an ir-modified MoO3 catalyst, which produced metastable Mo oxides due to rapid quenching at high temperatures. This unique structure promotes reaction-induced carburization during the RWGS reaction, resulting in oxidation-resistant carbonized oxygen Mo (MoOxCy) active sites.
The catalyst exhibits excellent activity and stability, highlighting the superiority of reaction-induced molybdenum carbide catalysts. At 600 °C, the CO yield was 17.5 mol/l h-1 with 100% CO selectivity. No obvious deactivation was observed during the 2000-hour stability test, showing its great potential for industrial application.
Further studies have shown that the key active sites for the RWGS reaction are unsaturated MoOxCy on the surface of Mo carbide. These species can maintain a dynamic equilibrium in a composite atmosphere of reduction, carburization, and oxidation, preventing severe deactivation.
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Improved CO2 conversion efficiency
In addition, the researchers proposed a new carbon cycle pathway in the RWGS reaction, which promotes H2 dissociation through *COH and is thermodynamically more favorable than the traditional redox pathway. This pathway can serve as a supplement to the redox mechanism to enhance the conversion of CO2 on Mo, thereby achieving excellent catalytic performance.
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