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Tailoring the simultaneous abatement of methanol and NOx on Sb−Ce−Zr catalysts via copper modification

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Abstract

Simultaneously removal of NOx and VOCs over NH3−SCR catalysts have attracted lots of attention recently. However, the presence of VOCs would have negative effect on deNOx efficiency especially at low temperature. In this study, copper modification onto Sb0.5CeZr2Ox (SCZ) catalyst were performed to enhance the catalytic performance for simultaneous control of nOx and methanol. It was obtained that copper addition could improve the low-temperature activity of both NOx conversion and methanol oxidation, where the optimal catalyst (Cu0.05SCZ) exhibited a deNOx activity of 96% and a mineralization rate of 97% at 250 °C, which are around 10% higher than that of Cu free sample. The characterization results showed that copper addition could obviously enhance the redox capacity of the catalysts. As such, the inhibition effect of methanol incomplete oxidation on NO adsorption and NH3 activation were then lessened and the conversion of surface formamide species were also accelerated, resulting in the rising of NOx conversion at low temperature. However, excessive copper addition would damage the Sb−Ce−Zr oxides solid solution structure owing to Cu−Ce strong interactions, decreasing the surface area and acidity. Meanwhile, due to easier over-oxidation of NH3 with more Cu addition, the temperature window for NOx conversion would become quite narrow. These findings could provide useful guidelines for the synergistic removal of VOCs over SCR catalyst in real application.

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Acknowledgements

The authors acknowledge for the financial support of Fundamental Research Funds for the Central Universities (No. 2021XZZX025), National Natural Science Foundation of China (No. 22076164) and Research Startup Program of Jiaxing University (No. CD70520027).

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Authors and Affiliations

  1. Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China

    Xiaoqiang Wang, Yanye Zhu, Yue Liu, Xiaole Weng & Zhongbiao Wu

  2. College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, China

    Xiaoqiang Wang

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  1. Xiaoqiang Wang
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  2. Yanye Zhu
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  3. Yue Liu
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  4. Xiaole Weng
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  5. Zhongbiao Wu
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Correspondence to Yue Liu.

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Highlights

• Cu addition enhances CH3OH oxidation and alleviates its inhibitory effect on SCR.

• Cu addition improves the activation of SCR reactants in the presence of methanol.

• Damaged structure by more Cu addition decreases specific surface area and acidity.

• Excessive Cu addition would lead to the narrowing of SCR temperature window.

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Wang, X., Zhu, Y., Liu, Y. et al. Tailoring the simultaneous abatement of methanol and NOx on Sb−Ce−Zr catalysts via copper modification. Front. Environ. Sci. Eng. 16, 130 (2022). https://doi.org/10.1007/s11783-022-1565-0

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  • DOI: https://doi.org/10.1007/s11783-022-1565-0

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