Novel nanowire self-assembled hierarchical CeO2 microspheres for low temperature toluene catalytic combustion
Novel nanowire self-assembled hierarchical CeO2 microspheres for low temperature toluene catalytic combustion
复制标题
新型纳米线自组装分级CeO2微球用于低温甲苯催化燃烧
DOI：
10.1016/j.cej.2017.08.110
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发表时间：
2018-01-01
影响因子：
15.1
通讯作者：
Li, Junhua
中科院分区：
文献类型：
--
作者：
Hu, Fangyun;Chen, Jianjun;Li, Junhua
首次研究了纯CeO_2分级催化剂对甲苯的催化氧化反应。采用水热驱动组装法制备了新型CeO 2催化剂。CeO 2催化剂的结构由纳米线自组装分级微球组成。与传统水热法制备的无孔催化剂相比，新型分级结构CeO 2催化剂表现出更好的催化活性。分级CeO 2催化剂在60，000 mL/（g.h）的高空速下甚至可以在低至210 ℃（T-90）时达到超过90%的甲苯转化率。其高催化活性的主要原因是其具有较大的比表面积，同时其多级孔结构为气态O-2在表面的解离提供了更多的表面氧空位。
The catalytic oxidation of toluene has been investigated over pure CeO2 hierarchical catalyst for the first time. The novel CeO2 catalyst was prepared by a hydrothermal-driven assembly method. The structure of CeO2 catalyst was consisted of nanowire self-assembled hierarchical microspheres. The new hierarchical CeO2 catalyst showed much better catalytic activity than analogous nonporous catalyst by traditional hydrothermal method. The hierarchical CeO2 catalyst could reach more than 90% toluene conversion even as low as 210 degrees C (T-90) under a high space velocity of 60,000 mL/(g.h). The high catalytic activities could be attributed to the large surface areas, in addition, the hierarchical porous structures provide more contents of surface oxygen vacancies for the dissociation of gaseous O-2 on the surface.