Accelerated synthesis of MnO2 nanocomposites by acid-free hydrothermal route for catalytic soot combustion
Accelerated synthesis of MnO2 nanocomposites by acid-free hydrothermal route for catalytic soot combustion
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无酸水热法加速合成MnO2纳米复合材料用于催化烟灰燃烧
DOI：
10.1039/c6ra02045c
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发表时间：
2016-05
期刊：
影响因子：
3.9
通讯作者：
Guan, Guofeng
中科院分区：
文献类型：
--
作者：
Feng, Nengjie;Meng, Jie;Wan, Hui;Guan, Guofeng
以KMnO4为原料，在不添加任何酸的情况下，采用水热法成功合成了具有多孔结构的MnO2纳米复合材料。在CeO2、CuO和Co3O4中，CeO2加速了MnO2的合成，促进了Ce3+和Mn7+之间的氧化还原转化。采用XRD、N2吸附-脱附、ICP、SEM、TEM、H2-TPR和XPS对催化剂进行了表征。CeO2与KMnO4水热反应后出现晶格收缩，高温煅烧后CeO2出现晶格膨胀。上述现象归因于CeO2中小尺寸Ce4+向大尺寸Ce3+的转化。与KMnO4水热反应后，表面Ce3+浓度降低。煅烧后Ce3+的比例越大，产生的氧空位越多，有利于烟尘的催化氧化。CeMn-600催化剂的催化性能最好，对应的T10、T50和Tm、l分别为320℃、418℃和420℃。CeO2与MnO2之间的强相互作用也是煤烟燃烧具有优异催化活性的关键因素。
MnO2 nanocomposites with porous structure were successfully synthesized by a facile hydrothermal route from KMnO4 without the addition of any acid. Among CeO2, CuO and Co3O4, an accelerated synthesis of MnO2 assisted by CeO2 was observed, which contributed to the redox transformation between Ce3+ and Mn7+. The as-prepared catalysts were characterized by XRD, N2 adsorption–desorption, ICP, SEM, TEM, H2-TPR, and XPS. Lattice shrink occurred after the hydrothermal reaction of CeO2 with KMnO4, while lattice expansion in CeO2 was observed after calcination at high temperature. The above phenomena are ascribed to the conversion between small sized Ce4+ and large sized Ce3+ in CeO2. The concentration of surface Ce3+ decreases after the hydrothermal reaction with KMnO4. The greater proportion of Ce3+ after calcination results in more oxygen vacancies that are beneficial for the catalytic oxidation of soot. The best catalytic performance is acquired over the CeMn-600 catalyst and the corresponding T10, T50, and Tm,l are 320 °C, 418 °C and 420 °C, respectively. The strong interaction between the CeO2 and MnO2 is also a key factor for outstanding catalytic activity for soot combustion.
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