In situ preparation of mesoporous Fe/TiO2 catalyst using Pluronic F127-assisted sol-gel process for mid-temperature NH3 selective catalytic reduction

doi:10.1016/S1872-2067(17)62897-3

Abstract

Abstract:

An Fe/TiO₂ catalyst with uniform mesopores was synthesized using Pluronic F127 as a struc-ture-directing agent. This catalyst was used for selective catalytic reduction of NO with NH₃. The catalytic activity and resistance to H₂O and SO₂ of Fe/TiO₂ prepared by a template method were better than those of catalysts synthesized using impregnation and coprecipitation. The samples were characterized using N₂-physisorption, transmission electron microscopy, ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, and in situ diffuse reflectance infrared Fouri-er-transform spectroscopy. The results showed that Pluronic F127 acted as a structural and chemi-cal promoter; it not only promoted the formation of a uniform mesoporous structure, leading to a higher surface area, but also improved dispersion of the active phase. In addition, the larger number of Lewis acidic sites, indicated by the presence of coordinated NH₃ species (1188 cm^-1) and the N-H stretching modes of coordinated NH₃ (3242 and 3388 cm^-1), were beneficial to mid-temperature selective catalytic reduction reactions.

Key words: Fe/TiO₂, Mesopore structure, Interaction, Mid-temperature NH₃ selective catalytic reduction

Yulin Li, Xiaojin Han, Yaqin Hou, Yaoping Guo, Yongjin Liu, Ning Xiang, Yan Cui, Zhanggen Huang. In situ preparation of mesoporous Fe/TiO₂ catalyst using Pluronic F127-assisted sol-gel process for mid-temperature NH₃ selective catalytic reduction[J]. Chinese Journal of Catalysis, 2017, 38(11): 1831-1841.

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In situ preparation of mesoporous Fe/TiO₂ catalyst using Pluronic F127-assisted sol-gel process for mid-temperature NH₃ selective catalytic reduction

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