Synthesis of α-MnO2-like rod catalyst using YMn2O5 A-site sacrificial strategy for efficient benzene oxidation
Synthesis of α-MnO2-like rod catalyst using YMn2O5 A-site sacrificial strategy for efficient benzene oxidation
复制标题
利用 YMn2O5 A 位牺牲策略合成 α-MnO2 类棒催化剂，实现苯的高效氧化
DOI：
10.1016/j.jhazmat.2020.123811
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发表时间：
2021
影响因子：
13.6
通讯作者：
Junhua Li
中科院分区：
文献类型：
--
作者：
Qilei Yang;Qi Li;Lei Li;Yue Peng;Dong Wang;Yongliang Ma;Junhua Li
苯这种典型的挥发性有机污染物的消除是环境科学家最具挑战性的课题之一。催化氧化技术被认为是消除其最有效的方法。在此，我们报道了通过酸蚀刻路线成功制备新型α-MnO2类棒催化剂，并提出YMn2O5莫来石作为新型前驱体。与原始 YMn2O5 和商业 MnO2 催化剂相比，优化的 α-MnO2 类棒催化剂显示出显着提高的苯氧化活性，在 60,000 mL g-1 h-1 的 GHSV 和 200 °C 下苯转化率为 100%。值得注意的是，类α-MnO2棒催化剂在较低温度（100-175℃）下的性能超过了商业Pt/Al2O3催化剂。 α-MnO2类棒催化剂优异的催化性能与其低温还原性和丰富的表面活性氧物种有关。在酸蚀过程中，更多的Mn3+被氧化为Mn4+，在类α-MnO2棒状催化剂上产生更多的表面氧空位，为氧分子提供更多的吸附位点，促进苯氧化反应。 α-MnO2 类棒催化剂应该是商业贵金属催化剂的一个很好的替代品，用于消除挥发性有机污染物，特别是在较低温度下。
The elimination of benzene, a typical volatile organic pollutant, is one of the most challenging topics for environmental scientists. Catalytic oxidation technology is considered the most efficient approach for its elimination. Herein, we report the successful preparation of a novel α-MnO2-like rod catalyst via an acid etching route and propose YMn2O5 mullite as a novel precursor. The optimized α-MnO2-like rod catalyst showed significantly improved benzene oxidation activity compared to the raw YMn2O5 and commercial MnO2 catalysts, resulting in 100 % benzene conversion at 200 °C at a GHSV of 60,000 mL g-1 h-1. Notably, the α-MnO2-like rod catalyst performance at lower temperatures (100-175 ℃) exceeded that of a commercial Pt/Al2O3 catalyst. The excellent catalytic performance of the α-MnO2-like rod catalyst is associated with its low-temperature reducibility and abundant surface-active oxygen species. During the acid etching process, more Mn3+ is oxidized to Mn4+, and more surface oxygen vacancies are generated on the α-MnO2-like rod catalyst, which provides more adsorption sites for oxygen molecules to promote the benzene oxidation reaction. The α-MnO2-like rod catalyst should be a great alternative to commercial noble metal catalysts for the elimination of volatile organic pollutants, especially at lower temperatures.