Toluene catalytic oxidation over the layered MOx - delta-MnO2 (M = Pt, Ir, Ag) composites originated from the facile self-driving combustion method
Toluene catalytic oxidation over the layered MOx - delta-MnO2 (M = Pt, Ir, Ag) composites originated from the facile self-driving combustion method
复制标题
层状 MOx - delta-MnO2 (M = Pt, Ir, Ag) 复合材料上的甲苯催化氧化源于简单的自驱动燃烧方法
DOI：
10.1016/j.fuel.2020.118888
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发表时间：
2021
期刊：
影响因子：
7.4
通讯作者：
Chu Wei
中科院分区：
文献类型：
--
作者：
Zhai Xuxu;Jing Fangli;Li Luming;Jiang Xia;Zhang Junjun;Ma Jun;Chu Wei
以高锰酸钾和柠檬酸为前驱体，采用自驱动燃烧（SDC）技术成功制备了一系列层状锰氧化物催化剂，并对其对甲苯的催化活性进行了评价。 90% 甲苯去除率 (T90) 和完全燃烧 (WHSV = 30000 mL gcat−1h−1) 的温度分别为 252 和 300 °C，其性能与我们之前报道的贵金属催化剂相当。为了使锰基催化剂在较低的操作温度下获得更好的催化活性，采用贵金属（Pt、Ir和Ag）对所获得的氧化锰基体进行调制，利用其不同于母体活性相的协同催化作用合成新型纳米催化剂。结果发现，0.5Pt-SDC-13 在贵金属改性锰基催化剂中表现出最高的催化性能，其中 T90 在 228 °C 下实现。锰基催化剂活性的提高应归因于关键因素的变化，例如锰价态、晶格氧密度及其迁移率。因此，SDC技术为开发高效、低能耗的催化剂载体降解VOCs提供了一条有效途径。
A series of layered manganese oxides catalysts were successfully prepared by self-driving combustion (SDC) technology using potassium permanganate and citric acid as precursors and evaluated in the catalytic activity of toluene. The temperature for 90% removal of toluene (T90) and total combustion (WHSV = 30000 mL gcat−1h−1) are separately 252 and 300 °C, which exhibits comparable performance to our previous reported noble metal catalysts. In order to achieve a better catalytic activity of manganese-based catalyst at the lower operating temperatures, noble metals (Pt, Ir, and Ag) were employed to modulate the obtained manganese oxide matrix to synthesize new nanocatalysts by using the synergistic catalytic effects that are distinct from those of their parent active phase. It was found that 0.5Pt-SDC-13 displays the highest catalytic performance among the noble metal modified Mn-based catalysts, in which T90was achieved at 228 °C. The improved activity for Mn-based catalysts should be attributed to the change in key factors such as Mn valence state, lattice oxygen density and its mobility. Therefore, the SDC technology provides an effective pathway to exploit efficient and low energy consumption catalysts carrier for the degradation of VOCs.