Excellent stability for catalytic oxidation formaldehyde over defective δ-MnO2 nanoparticles at room temperature
Excellent stability for catalytic oxidation formaldehyde over defective δ-MnO2 nanoparticles at room temperature
复制标题
室温下对有缺陷的 π-MnO2 纳米粒子催化氧化甲醛具有优异的稳定性
DOI：
10.1016/j.jece.2022.109064
复制
发表时间：
2022
影响因子：
7.7
通讯作者：
Haibao Huang
中科院分区：
文献类型：
--
作者：
Ruimei Fang;Xinyue Huang;Xiao'ai Luo;Yanjuan Sun;Zixun Liu;Liang Ao;Fan Dong;Haibao Huang
在δ-MnO2上设计氧空位是一种有效的产生活性氧物种的策略，以提高其对甲醛氧化的催化活性。本工作采用基于还原剂的氧化还原方法对δ-MnO2催化剂上的氧空位进行了富集化。在制备过程中使用了不同的还原剂，如甲醇、乙醇和异丙醇，并考察了它们对δ-MnO2催化剂降解甲醛的催化活性和稳定性的影响。以异丙醇为还原剂制备的MnO2-Iso样品具有良好的稳定性和催化活性。在六次循环试验中，甲醛去除效率在每次试验15h内保持在90%以上。异丙醇削弱了MnO_2-ISO催化剂层间的范德瓦尔斯作用力，促进了活性氧物种的生成。羟基的消耗和生成之间的平衡是MnO2-Iso催化剂具有良好稳定性的原因。本工作为纳米结构δ-MnO2在室温下室内甲醛分解中的广泛商业应用提供了理论支持。
Engineering oxygen vacancies on δ-MnO2is an efficient strategy to generate active oxygen species for boosting its catalytic activity towards HCHO oxidation. In this work, a reductant-based redox method was employed to enrich the oxygen vacancies on δ-MnO2catalysts. Different reductants, such as methanol, ethanol and isopropanol, were employed during preparation process and studied for their effects on catalytic activity and stability of δ-MnO2catalysts towards formaldehyde degradation. The MnO2-Iso sample prepared by isopropanol as reductant shows excellent stability and catalytic activity. In the six cycling tests, the formaldehyde removal efficiency keeps above 90% during 15 h per test. The isopropanol weakens the van der vaals force between the interlayers of MnO2-Iso catalyst and promotes the generation of active oxygen species. The balance between consumption and generation of hydroxyl groups is responsible for the excellent stability of MnO2-Iso catalyst. This work provides theoretical support for widespread commercial application of δ-MnO2with nanoparticle structure in the decomposition of indoor formaldehyde at room temperature.