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A Probe into the Low-Temperature SCR Activity: NO Oxidative Activation to Nitrite-Intermediates

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Abstract

Investigation of the low-temperature (LT) selective catalytic reduction (SCR) of NOx has adsorbed extensive efforts, and is now a hot topic in environmental catalysis. In this work, we cautiously explore the mechanism beneath LT-SCR via a combination of chemical-trap** methods, using BaO/Al2O3 as a NOx-intermediate trap, temperature-programmed desorption (TPD) and in situ FTIR spectroscopy over a series of metal-oxide catalysts. Our results show a linear correlation between LT-SCR rates and amounts of nitrites generated from NO oxidative activation and sequentially stored on BaO/Al2O3, implying key roles of nitrites/nitrite-precursors in LT-SCR.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2018YFC0213400), the National Science Foundation of China (No. 51836006 and No. U1609212), the Fundamental Research Funds for the Central Universities (2021QNA4011).

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, State Environmental Protection Center for Coal-Fired Air Pollution Control, Zhejiang University, Hangzhou, 310027, China

    Yu Zhang, Yi Dong, Renzhi Zou, Wenshuo Hu, Mingchu Ran, Hao Song, Shaojun Liu, Chenghang Zheng & **ang Gao

  2. The Energy Engineering Design and Research Institute of Zhejiang University Co. Ltd, Hangzhou, 310027, China

    Zhiying Zhou

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  1. Yu Zhang
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  2. Yi Dong
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  3. Renzhi Zou
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Correspondence to Hao Song or **ang Gao.

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Zhang, Y., Dong, Y., Zou, R. et al. A Probe into the Low-Temperature SCR Activity: NO Oxidative Activation to Nitrite-Intermediates. Catal Lett 152, 1140–1144 (2022). https://doi.org/10.1007/s10562-021-03686-6

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  • DOI: https://doi.org/10.1007/s10562-021-03686-6

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