Gu Wenxiu, Li Chenqi, Qiu Jianhao, Yao Jianfeng
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
J Hazard Mater. 2021 Apr 15;408:124458. doi: 10.1016/j.jhazmat.2020.124458. Epub 2020 Nov 4.
A facile and robust interface reaction method for controllable synthesis of hierarchically structured flower-like MnO hollow microspheres was developed at a low cost. With MnCO microspheres as homologous templates, KMnO was used to conduct redox reactions with the surface layer of the MnCO microspheres to form porous flower-like MnO. Then, the internal template was removed by HCl etching to obtain flower-like MnO hollow microspheres. HCl plays the dual role of removing the template and generating oxygen vacancies through acid etching. The as-prepared flower-like MnO 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 Mn, 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.
开发了一种简便且稳健的界面反应方法，以低成本可控合成具有分层结构的花状MnO空心微球。以MnCO微球为同源模板，用KMnO与MnCO微球的表层进行氧化还原反应，形成多孔花状MnO。然后，通过HCl蚀刻去除内部模板，得到花状MnO空心微球。HCl起到去除模板和通过酸蚀刻产生氧空位的双重作用。所制备的花状MnO空心微球由于具有高比表面积、丰富的氧空位、高含量的Mn、大量的酸性位点和强酸性等理想特性，对甲苯氧化表现出优异的低温催化活性。这项工作为简便构建具有工业应用前景的高性能挥发性有机化合物氧化催化剂提供了一种新策略。
