Micro-physicochemical characteristics and low-temperature SCR activities of the Mn–Ce–Cr catalysts on different carriers were investigated with SEM, XRD, XPS, FTIR, and denitration experiments. Mn–Ce–Cr catalysts carried on TiO2 and ZrO2, and composite carrier containing Al2O3 and TiO2 had visible element interactions on the surfaces, and Mn presented the mixed valences of Mn3+ and Mn4+. Mn3+ was transferred to Mn4+ due to the oxidation processes of Ce3+ to Ce4+ and Cr3+ to Cr6+, and the Oα/Oβ ratio decreased during the SCR process. Compared with single carriers such as TiO2 or ZrO2, the catalysts on the composite carriers of Al2O3 and TiO2 had better pore structures and higher fractions of Mn4+, Ce3+, Cr6+, and chemisorbed oxygen. It could also absorb the coordination-state NH3 well, especially the higher activity l-acid sites during the SCR process, and contribute to the formation of composite oxide MnxTi1−xO on Mn–Ce–Cr/Al2O3+TiO2 catalyst. All the above factors had positive effects on the low-temperature SCR. However, Co-doping in Mn–Ce–Cr catalysts could not improve the pore structures or promote the dispersions of Mn–Ce–Cr active substances on the carrier surface. Groups such as nitrates and nitrites produced by NO adsorption would hinder the adsorption of NH3 and low-temperature SCR. Mn–Ce–Cr/Al2O3+TiO2 catalyst had high low-temperature SCR activity, while Mn–Ce–Cr/ZrO2 catalyst was the most unstable with the lowest denitration efficiency. Moreover, for the scrapped catalyst from coal-fired power plants, it could still be used as the carrier of the Mn–Ce–Cr catalyst, and its SCR characteristics were much better than the above catalysts, especially at broader temperature range.
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This study received financial support from the National Natural Science Foundation of China (51106133, 21237003, 50806041), the Science and Technology Support Program of Jiangsu Province (BE2014682, BY2015061-05), the Yangzhou City Focus on Research and Development Project (YZ2016261, YZ2015043), and the National Spark Program (2015GA690279) and Shanghai Science and Technology Development (15dz1200703, 15110501000).
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Novelty or Significance
Firstly, the Co-doping could not improve the pore structures of Mn–Ce–Cr series catalysts, but aggravated compaction increasingly on catalyst surfaces.
Secondly, the composite oxide MnxTi1−xO formed on the Mn–Ce–Cr/Al2O3+TiO2 catalyst with higher crystallinity had a better effect on the low-temperature SCR.
Thirdly, the Mn3+ transferred electrons to the Mn4+ due to the oxidation processes of Ce3+ to Ce4+ and Cr3+ to Cr6+, and the Oα/Oβ ratio decreased during SCR process, especially for the Mn–Ce–Cr/Al2O3+TiO2 catalyst, which could promote the low-temperature SCR.
Lastly, the scrapped SCR catalyst from a coal-fired power plant was used as the carrier of the Mn–Ce–Cr catalyst, and its SCR characteristics were found to be much better even at a wider temperature range.
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Qi, Y., Shan, X., Wang, M. et al. Study on Low-Temperature SCR Denitration Mechanisms of Manganese-Based Catalysts with Different Carriers. Water Air Soil Pollut 231, 289 (2020). https://doi.org/10.1007/s11270-020-04644-5
- Scrapped industrial catalyst
- Different carriers