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Characterization and Reuse Investigation on Scrapped V2O5–WO3/TiO2 Catalysts Operated in Various Industrial Flue Gases for NH3-SCR Reactions

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Abstract

The three scrapped industrial V2O5–WO3/TiO2 catalysts, which had operated in three coal-fired power plants with various flue gas conditions in China, were collected and characterized by XRF, XRD, SEM, and XPS to analyze their deactivation mechanisms, with the complexities of various industrial flue gases from coal combustion considered. Then one scrapped industrial catalyst was selected as the carrier to prepare a new catalyst by adding Mn, Ce, and Cr species, for SCR reactions in flue gas with as well as without SO2 at much wider temperature range. Results showed that the content of TiO2 did not change and the structure kept still, further illustrating that the scrapped catalysts could be utilized as the carrier in the new catalyst manufacturing process. The SO2 in flue gas indeed increased the V4+/V5+ ratio on the catalyst surface, moreover, the alkaline earth metal oxides such as BaO and CaO contributed to more sulfates depositing on the catalyst surface, increased the ratios of S6+/S4+ and Oα/Oβ. For the new Mn–Ce–Cr catalyst carried on the scrapped industrial catalyst, it showed high SCR activities at a wider temperature range of 170 to 370 °C but low resistance for SO2 poisoning, indicating that it could be further developed and utilized for SCR process of boilers burning natural gas or biomass.

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Acknowledgements

We greatly appreciate the financial support from National Natural Science Foundation of China (51106133, 21237003, 50806041), Science and Technology Support Program of Jiangsu Province (BE2014682), Yangzhou City Focus on Research and Development Project (YZ2016261), Science and Technology Innovation Incubation Program of Yangzhou University (2016CXJ037, 2017CXJ048), National Spark Program (2015GA690279) and Shanghai Science and Technology Development (15dz1200703, 15110501000).

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Authors and Affiliations

  1. College of Electrical, Energy and Power Enginering, Yangzhou University, Yangzhou, 225127, China

    Yongfeng Qi, Zhanpeng Zhang, Meiting Wang, Xiaowei Shan & Panle Ge

  2. Xi’an Thermal Power Research Institute Co., Ltd., Suzhou Branch, Suzhou, 215153, China

    Yubao Song

  3. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China

    Jiang Wu

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  1. Yongfeng Qi
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Qi, Y., Zhang, Z., Wang, M. et al. Characterization and Reuse Investigation on Scrapped V2O5–WO3/TiO2 Catalysts Operated in Various Industrial Flue Gases for NH3-SCR Reactions. Waste Biomass Valor 12, 2597–2608 (2021). https://doi.org/10.1007/s12649-020-01158-3

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