PREPARATION OF NANO MANGANESE OXIDE AND ITS APPLICATION IN THE WET OXIDATION OF PHENOL
Abstract
Manganese oxide nanoparticles have application prospects in catalysis due to their high specific surface area, abundant active sites, and excellent chemical stability. In this study, nano α-Mn2O3 catalysts were synthesized via microwave-assisted carbonization in a glucose-urea system. Characterization results revealed that the amount of urea added influences the structure of the prepared manganese oxide, the optimized sample, Mn-3 possessed the smallest crystallite size, the highest specific surface area, and a mesoporous structure. In the catalytic wet oxidation of phenol, Mn-3 demonstrated a remarkable conversion rate of 97.8 %, significantly outperforming α-Mn2O3 prepared by conventional precipitation methods of 58.8 %. Recycling tests indicated that Mn-3 retained a 60 % conversion efficiency after five cycles, demonstrating good stability. This superior performance was attributed to its abundant surface defects, high specific surface area, and mesoporous structure.
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