双金属片
甲苯
催化作用
燃烧
材料科学
化学工程
空间速度
碳纤维
催化燃烧
碱金属
比表面积
模板方法模式
模板
分子
纳米技术
无机化学
化学
物理化学
有机化学
选择性
复合数
工程类
复合材料
作者
Lei Li,Changyu Zhang,Jinlong Yan,Dong Wang,Yue Peng,Junhua Li,John C. Crittenden
出处
期刊:Chemcatchem
[Wiley]
日期:2020-04-02
卷期号:12 (10): 2872-2879
被引量:27
标识
DOI:10.1002/cctc.202000038
摘要
Abstract The hollow structured Mn−Ce binary catalysts were facilely prepared utilizing carbon microsphere as templates. Based on acid/alkali‐pretreatment of the carbon templates, the Mn−Ce shell structure and surface components were facilely. The MnCe−OH catalyst, obtained from the alkali‐treated carbon sphere, showed the highest catalytic performance for toluene combustion with T 90 (the temperature for 90 % toluene conversion) of 237 °C at a space velocity of 36,000 mL/(g ⋅ h). The according specific rate is 4.8*10 −9 mol/(m 2 ⋅ s) and the lower active energy value is 98.9 kJ/mol. With the aid of various characterizations, it indicates that the thinner and porous shell should accounted for the enhanced activity, which provided enriched accessible active sites and enhanced mass transfer for reactants. The abundant surface‐active oxygen (48.8 %) and the interaction between Ce and Mn species also benefited the superior catalytic performance. Additionally, a possible reaction pathway was provided in terms of the in‐situ DRIFTS study, revealing that the toluene molecules transformed into aldehydic, then into benzoate species, and finally formed CO 2 and H 2 O.
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