Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity
Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity
复制标题
钛柱蒙脱石负载 Fe 催化剂用于甲苯氧化的性能：Fe 对催化活性的影响
DOI：
10.1016/j.clay.2016.05.022
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发表时间：
2016-11-01
影响因子：
5.6
通讯作者：
Zhu, Runliang
中科院分区：
文献类型：
--
作者：
Liang, Xiaoliang;Qi, Feihong;Zhu, Runliang
本研究合成了二氧化钛柱蒙脱土（Ti-PILC）负载铁催化剂，并将其用于甲苯的催化氧化。采用XRD、N-2吸附-脱附等温线、XPS、H-2-TPR和NH3-TPD对催化剂进行了表征。Fe的加入保留了Ti-PILC的介孔结构和孔隙率。在稳态催化试验和动力学分析中，甲苯在所研究催化剂上的氧化反应遵循Mars-Van Krevelen机理。通过生成强酸位点和丰富的表面氧，Fe的引入明显提高了Ti-PILC对甲苯氧化的催化活性。但随着铁含量的增加，活性先增强后降低。从反应机理和上述理化性质的变化等方面探讨了不同铁种对Ti-PILC上甲苯催化氧化的影响。此外，钛- pilc负载的铁催化剂在水蒸气存在下表现出高稳定性和优异的活性，这是一个应用的兴趣。(C) 2016 Elsevier B.V.版权所有
In this study, TiO2-pillared montmorillonite (Ti-PILC) supported Fe catalysts were synthesized and used for the catalytic oxidation of toluene. The prepared catalysts were characterized by a combination of XRD, N-2 adsorption -desorption isotherms, XPS, H-2-TPR and NH3-TPD. The Fe introduction preserves the mesoporous structure and porosity of Ti-PILC. In the steady-state catalytic test and kinetic analysis, the toluene oxidation over studied catalysts follows the Mars-Van Krevelen mechanism. By the generation of strong acid sites and abundant surface oxygen species, Fe introduction obviously improves the catalytic activity of Ti-PILC for toluene oxidation. But with the increase of Fe content, the activity initially enhances, and then decreases. The effect of Fe species on the promoted toluene oxidation over Ti-PILC was discussed in view of reaction mechanism and above-mentioned variations of physicochemical properties. Furthermore, the Ti-PILC supported Fe catalysts display high stability and superior activity in the presence of water vapor, which present an applied interest. (C) 2016 Elsevier B.V. All rights reserved.