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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+

Published online by Cambridge University Press:  06 August 2020

Zhi-bo Xiong*
Affiliation:
School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai200093, China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai200093, China
Xiao-ke Qu
Affiliation:
School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai200093, China
Yan-ping Du
Affiliation:
China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai200240, China
Cheng-xu Li
Affiliation:
School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai200093, China
Jing Liu
Affiliation:
School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai200093, China
Wei Lu
Affiliation:
School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai200093, China
Shui-mu Wu
Affiliation:
School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai200093, China SPIC Powder Plant Operation Technology (Beijing) Co., Ltd, Beijing102209, China
*
a)Address all correspondence to this author. e-mail: xzb328@163.com
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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 $\lpar {\rm {O}^{\prime}}_{\rm \alpha} \rpar$ 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 ${\rm {O}^{\prime}}_{\rm \alpha}$. Ce20W10Ti100Oz–Ce3+:Ce4+ = 17.5:2.5 + H2O2 exhibits the highest catalytic activity compared with the conventional ones (Fig. 5).

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Copyright © Materials Research Society 2020

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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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