Abstract
A facile and robust interface reaction method for controllable synthesis of hierarchically structured flower-like MnO2 hollow microspheres was developed at a low cost. With MnCO3 microspheres as homologous templates, KMnO4 was used to conduct redox reactions with the surface layer of the MnCO3 microspheres to form porous flower-like MnO2. Then, the internal template was removed by HCl etching to obtain flower-like MnO2 hollow microspheres. HCl plays the dual role of removing the template and generating oxygen vacancies through acid etching. The as-prepared flower-like MnO2 hollow microspheres exhibited excellent low-temperature catalytic activity for toluene oxidation owing to the desirable features of a high specific surface area, abundant oxygen vacancies, high content of Mn4+, a high number of acidic sites and a strong acidity. This work provides a new strategy for the facile construction of high-performance volatile organic compounds oxidation catalysts with industrial application prospects.
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