Abstract
Selective catalytic reduction of NO with NH3 (NH3-SCR) is one of the most common technique for elimination of NOx. The promotional effect of Fe additive on the NH3-SCR activity of the CeVO4/TiO2-graphene (GE) is systematically studied. The results exhibited that the low-temperature NOx conversion could be enhanced dramatically via the addition of Fe and Fe0.5Ce0.5VO4/TiO2-GE displayed the highest conversion of NOx in the wide temperature window (200–400 °C). It is because that Fe3+ + Ce3+ ↔ Fe2+ + Ce4+ facilitated the oxidization of NO to NO2 at low temperature and led to the “Fast SCR,” thereby raising the SCR performance. What is more, the introduction of Fe enhanced redox ability, the surface relative percentage of Ce3+, V5+ and the chemical adsorbed oxygen. Furthermore, the high surface concentration of Ce3+ species can produce more active oxygen and leads to the “Fast SCR” reaction. In addition, the Fe0.5Ce0.5VO4/TiO2-GE catalyst showed excellent H2O/SO2 tolerance, which may be due to the decomposition of ammonium bisulphite under high temperature and the hydrophobicity of graphene. What is more, it displayed outstanding the stability. This work would provide theoretical reference for the practical application of NOx abatement via NH3-SCR.
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This work was financially supported by the National Natural Science Foundation of China (51708309), Heilongjiang Education Department’s Specialized Subject of Plant Food Processing Technology (No: YSTSXK201866).
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All authors have contributed the creation of this manuscript. Conceptualization: Zhifang Li, Jinxing Cui, Changlong Yang; Material preparation, data collection and analysis: Zhifang Li, Qian Zhang, Jian Yang, Yueyu Li, Jinxing Cui, Yuanyuan Ma and Changlong Yang; Writing—original draft: Zhifang Li, Jinxing Cui, Changlong Yang; Writing—review and editing: Zhifang Li, Qian Zhang, Jian Yang, Yueyu Li, Jinxing Cui, Yuanyuan Ma and Changlong Yang.
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Li, Z., Zhang, Q., Yang, J. et al. Fabrication of wide temperature FexCe1-xVO4 modified TiO2-graphene catalyst with excellent NH3-SCR performance and strong SO2/H2O tolerance. Environ Sci Pollut Res 29, 53259–53268 (2022). https://doi.org/10.1007/s11356-022-18774-2
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DOI: https://doi.org/10.1007/s11356-022-18774-2