Highly Effective Ordered Mesoporous Cobalt and Manganese Composite Oxide Catalysts for Preferential CO Oxidation

초록

Preferential CO oxidation is a crucial step in promoting clean hydrogen energy systems, creating an urgent need to develop reliable, cost-effective catalysts that exhibit high activity and selectivity under realistic conditions. The highly ordered mesoporous composite materials as catalysts, consisting of cobalt and manganese oxide, have been successfully synthesized using the nano-replication method with varying Co and Mn atomic ratios. To investigate the structural properties of the catalysts, several techniques have been utilized, such as X-ray Diffraction, Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and H2-temperature Programmed Reduction (H2-TPR). The catalyst exhibited a uniform distribution of mesopores and a high specific surface area, significantly improving its catalytic performance. Under optimized conditions (without H2 pretreatment), the catalyst with a Co:Mn atomic ratio of 90:10 demonstrated superior CO oxidation performance. This ratio is the most stable, exhibiting a 100% CO conversion at 125 degrees C. The catalyst's stable mesoporous structure and the coordinating effect between Co and Mn contributed to its excellent catalytic ability for CO oxidation, with a high selectivity for O2.

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