Influence of chromium modification on the properties of MnOx-FeOx catalysts for the low-temperature selective catalytic reduction of NO by NH3

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (4): 617-623.

Influence of chromium modification on the properties of MnO_x-FeO_x catalysts for the low-temperature selective catalytic reduction of NO by NH₃

Kai Shen, Yaping Zhang, Xiaolei Wang, Haitao Xu, Keqin Sun, Changcheng Zhou

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

收稿日期:2012-05-24 修回日期:2012-09-26 出版日期:2013-07-20 发布日期:2013-07-27
通讯作者: Yaping Zhang
基金资助:
This work was supported by Jiangsu Natural Science Foundation (No. BK2012347) and the National High Technology and Development Program of China (863 Programs, No.2007AA061802).

Influence of chromium modification on the properties of MnO_x-FeO_x catalysts for the low-temperature selective catalytic reduction of NO by NH₃

Kai Shen, Yaping Zhang, Xiaolei Wang, Haitao Xu, Keqin Sun, Changcheng Zhou

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2012-05-24 Revised:2012-09-26 Online:2013-07-20 Published:2013-07-27
Supported by:
This work was supported by Jiangsu Natural Science Foundation (No. BK2012347) and the National High Technology and Development Program of China (863 Programs, No.2007AA061802).

摘要/Abstract

摘要： Catalytic properties of MnO_x-FeO_x complex oxide (hereafter denoted as Mn-Fe) catalysts modified with different loadings of chromium oxide were investigated by using the combination of physico-chemical techniques, such as N₂ physisorption, X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), in situ Fourier transform infrared spectroscopy (in situ FT-IR) and temperature-programmed reduction (TPR) and their catalytic activities were evaluated with the selective catalytic reduction (SCR) of NO_x by NH₃. It was found that with the addition of Cr, more NO could be removed in the low-temperature window (below 120 ℃). Among the tested catalysts, Mn-Fe-Cr (2 : 2 : 1) catalyst exhibited the best catalytic performance at 80 ℃ with the NO conversion higher than 90%. The combination of the reaction and characterization results indicated that (1) the strong interaction among tertiary metal oxides existed in the catalysts when Cr was appropriately added, which made the active components better dispersed with less agglomeration and sintering and the largest BET specific surface area could be obtained; (2) Cr improved the low-temperature reducibility of the catalyst and promoted the formation of the active intermediate (—NH₃⁺), which favored the low-temperature SCR reaction.

关键词: MnO_x-FeO_x, Cr, modification, low-temperature selective catalytic reduction, catalysts

Abstract: Catalytic properties of MnO_x-FeO_x complex oxide (hereafter denoted as Mn-Fe) catalysts modified with different loadings of chromium oxide were investigated by using the combination of physico-chemical techniques, such as N₂ physisorption, X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), in situ Fourier transform infrared spectroscopy (in situ FT-IR) and temperature-programmed reduction (TPR) and their catalytic activities were evaluated with the selective catalytic reduction (SCR) of NO_x by NH₃. It was found that with the addition of Cr, more NO could be removed in the low-temperature window (below 120 ℃). Among the tested catalysts, Mn-Fe-Cr (2 : 2 : 1) catalyst exhibited the best catalytic performance at 80 ℃ with the NO conversion higher than 90%. The combination of the reaction and characterization results indicated that (1) the strong interaction among tertiary metal oxides existed in the catalysts when Cr was appropriately added, which made the active components better dispersed with less agglomeration and sintering and the largest BET specific surface area could be obtained; (2) Cr improved the low-temperature reducibility of the catalyst and promoted the formation of the active intermediate (—NH₃⁺), which favored the low-temperature SCR reaction.

Key words: MnO_x-FeO_x, Cr, modification, low-temperature selective catalytic reduction, catalysts

Kai Shen, Yaping Zhang, Xiaolei Wang, Haitao Xu, Keqin Sun, Changcheng Zhou. Influence of chromium modification on the properties of MnO_x-FeO_x catalysts for the low-temperature selective catalytic reduction of NO by NH₃[J]. 能源化学(英文), 2013, 22(4): 617-623.

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Influence of chromium modification on the properties of MnO_x-FeO_x catalysts for the low-temperature selective catalytic reduction of NO by NH₃

Influence of chromium modification on the properties of MnO_x-FeO_x catalysts for the low-temperature selective catalytic reduction of NO by NH₃

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