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Selective catalytic reduction of NOx with NH3 over cerium–tungsten–titanium mixed oxide catalyst: Synergistic promotional effect of H2O2 and Ce4+

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Abstract

A highly active catalyst of cerium–tungsten–titanium mixed oxide was synthesized by introducing Ce4+ and H2O2 in the base sample of Ce20W10Ti100Oz–Ce3+. As a consequence, the NH3-SCR activity of Ce20W10Ti100Oz–Ce3+ is significantly improved as the additives of Ce4+ and H2O2 enlarge the Brunauer–Emmett–Teller (BET) surface area by refining its pore size. Meanwhile, the introduction of Ce4+ increases the Lewis acid sites of Ce20W10Ti100Oz–Ce3+ and decreases its low-temperature Brønsted acid sites. The further addition of H2O2 improves the Brønsted acid sites and dispersion of cerium/tungsten species, and thereby enhances the concentrations of the adsorbed oxygen (Oα) and the adsorbed oxygen \({O'_\alpha }\) due to the activation of chemisorbed water on the surface of the catalyst. The addition of Ce4+ and H2O2 shows a synergistic promotional effect, which is due to the largest BET surface area and the highest concentrations of Oα or/and \({O'_\alpha }\). Ce20W10Ti100Oz–Ce3+:Ce4+ = 17.5:2.5 + H2O2 exhibits the highest catalytic activity compared with the conventional ones (Fig. 5).

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Acknowledgment

This work was supported by the National Science Foundation of China (No. 51406118), Program of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning (No. QD2015017).

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Authors and Affiliations

  1. School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China

    Zhi-bo Xiong, Xiao-ke Qu, Cheng-xu Li, Jing Liu, Wei Lu & Shui-mu Wu

  2. Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai, 200093, China

    Zhi-bo Xiong

  3. China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yan-ping Du

  4. SPIC Powder Plant Operation Technology (Beijing) Co., Ltd, Beijing, 102209, China

    Shui-mu Wu

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  1. Zhi-bo Xiong
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Xiong, Zb., Qu, Xk., Du, Yp. et al. Selective catalytic reduction of NOx with NH3 over cerium–tungsten–titanium mixed oxide catalyst: Synergistic promotional effect of H2O2 and Ce4+. Journal of Materials Research 35, 2218–2229 (2020). https://doi.org/10.1557/jmr.2020.203

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