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Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity
AbstractIn 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, N2 adsorption-desorption isotherms, XPS, H2-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.
Graphical abstract
HighlightsFe introduction does not change the pillared structure and porosity of Ti-PILC.Strong acid sites were generated on the surface of Ti-PILC after Fe introduction.The activity of Fe based Ti-PILC was positively related to surface oxygen species.The catalyst displays high stability and activity in the presence of water vapor.
Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity
AbstractIn 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, N2 adsorption-desorption isotherms, XPS, H2-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.
Graphical abstract
HighlightsFe introduction does not change the pillared structure and porosity of Ti-PILC.Strong acid sites were generated on the surface of Ti-PILC after Fe introduction.The activity of Fe based Ti-PILC was positively related to surface oxygen species.The catalyst displays high stability and activity in the presence of water vapor.
Performance of Ti-pillared montmorillonite supported Fe catalysts for toluene oxidation: The effect of Fe on catalytic activity
Liang, Xiaoliang (author) / Qi, Feihong (author) / Liu, Peng (author) / Wei, Gaoling (author) / Su, Xiaoli (author) / Ma, Lingya (author) / He, Hongping (author) / Lin, Xiaoju (author) / Xi, Yunfei (author) / Zhu, Jianxi (author)
Applied Clay Science ; 132-133 ; 96-104
2016-05-24
9 pages
Article (Journal)
Electronic Resource
English
Pillared montmorillonite supported cobalt catalysts for the Fischer–Tropsch reaction
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