Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides
A series of Mn-Ce-V-WOx/TiO2 composite oxide catalysts with different molar ratios (active components/TiO2 = 0.1, 0.2, 0.3, 0.6) have been prepared by wet impregnation method and tested in selective catalytic reduction (SCR) of NO by NH3 in a wide temperature range. These catalysts were also charact...
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doaj-17e199ff79954bb79312388bf2ae1b842020-11-24T21:42:02ZengMDPI AGCatalysts2073-43442018-02-01827610.3390/catal8020076catal8020076Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic OxidesXuteng Zhao0Lei Mao1Guojun Dong2School of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, ChinaSchool of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, ChinaSchool of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, ChinaA series of Mn-Ce-V-WOx/TiO2 composite oxide catalysts with different molar ratios (active components/TiO2 = 0.1, 0.2, 0.3, 0.6) have been prepared by wet impregnation method and tested in selective catalytic reduction (SCR) of NO by NH3 in a wide temperature range. These catalysts were also characterized by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), in situ Fourier Transform infrared spectroscopy (in situ FTIR), H2-Temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS). The results show the catalyst with a molar ratio of active components/TiO2 = 0.2 exhibits highest NO conversion value between 150 °C to 400 °C and good resistance to H2O and SO2 at 250 °C with a gas hourly space velocity (GHSV) value of 40,000 h−1. Different oxides are well dispersed and interact with each other. NH3 and NO are strongly adsorbed on the catalyst surface and the adsorption of the reactant gas leads to a redox cycle with the valence state change among the surface oxides. The adsorption of SO2 on Mn4+ and Ce4+ results in good H2O and SO2 resistance of the catalyst, but the effect of Mn and Ce are more than superior water and sulfur resistance. The diversity of valence states of the four active components and their high oxidation-reduction performance are the main reasons for the high NO conversion in this system.http://www.mdpi.com/2073-4344/8/2/76composite oxide catalystNH3-SCR of NOlifetimeH2O and SO2 resistance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xuteng Zhao Lei Mao Guojun Dong |
spellingShingle |
Xuteng Zhao Lei Mao Guojun Dong Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides Catalysts composite oxide catalyst NH3-SCR of NO lifetime H2O and SO2 resistance |
author_facet |
Xuteng Zhao Lei Mao Guojun Dong |
author_sort |
Xuteng Zhao |
title |
Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides |
title_short |
Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides |
title_full |
Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides |
title_fullStr |
Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides |
title_full_unstemmed |
Mn-Ce-V-WOx/TiO2 SCR Catalysts: Catalytic Activity, Stability and Interaction among Catalytic Oxides |
title_sort |
mn-ce-v-wox/tio2 scr catalysts: catalytic activity, stability and interaction among catalytic oxides |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2018-02-01 |
description |
A series of Mn-Ce-V-WOx/TiO2 composite oxide catalysts with different molar ratios (active components/TiO2 = 0.1, 0.2, 0.3, 0.6) have been prepared by wet impregnation method and tested in selective catalytic reduction (SCR) of NO by NH3 in a wide temperature range. These catalysts were also characterized by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), in situ Fourier Transform infrared spectroscopy (in situ FTIR), H2-Temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS). The results show the catalyst with a molar ratio of active components/TiO2 = 0.2 exhibits highest NO conversion value between 150 °C to 400 °C and good resistance to H2O and SO2 at 250 °C with a gas hourly space velocity (GHSV) value of 40,000 h−1. Different oxides are well dispersed and interact with each other. NH3 and NO are strongly adsorbed on the catalyst surface and the adsorption of the reactant gas leads to a redox cycle with the valence state change among the surface oxides. The adsorption of SO2 on Mn4+ and Ce4+ results in good H2O and SO2 resistance of the catalyst, but the effect of Mn and Ce are more than superior water and sulfur resistance. The diversity of valence states of the four active components and their high oxidation-reduction performance are the main reasons for the high NO conversion in this system. |
topic |
composite oxide catalyst NH3-SCR of NO lifetime H2O and SO2 resistance |
url |
http://www.mdpi.com/2073-4344/8/2/76 |
work_keys_str_mv |
AT xutengzhao mncevwoxtio2scrcatalystscatalyticactivitystabilityandinteractionamongcatalyticoxides AT leimao mncevwoxtio2scrcatalystscatalyticactivitystabilityandinteractionamongcatalyticoxides AT guojundong mncevwoxtio2scrcatalystscatalyticactivitystabilityandinteractionamongcatalyticoxides |
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