Negatively Charged Single-Atom Pt Catalyst Shows Superior SO2 Tolerance in NOx Reduction by CO

Yongjun Ji*, Shaomian Liu, Shaojia Song, Wenqing Xu*, Liang Li, Yu Zhang, Wenxing Chen, Huifang Li, Jingang Jiang*, Tingyu Zhu, Zhenxing Li*, Ziyi Zhong, Dingsheng Wang, Guangwen Xu, Fabing Su*

*Corresponding author for this work

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Abstract

Pt-based catalysts are promising for the selective catalytic reduction of NOx by CO (CO-SCR), but some technical issues hinder their practical application, including the high Pt loading needed, high reduction temperature, and the low tolerance toward SO2. Here, we report a novel Pt catalyst for CO-SCR, which has negatively charged single-atom Pt embedded on CuO squares, and the latter is supported on CoAlO nanosheets. This Pt-CuO/CoAlO catalyst with an ultra-low Pt loading (0.02 wt %) exhibited 91% NO conversion and 80% N2 selectivity in 3% O2 at 200 °C. More importantly, it showed almost no activity loss in 200 ppm SO2 over a 15 h test. The theoretical calculations reveal that the negatively charged Pt has a stronger NO adsorption ability than the positively charged Pt, and Cu serves as the CO adsorption site.

Original languageEnglish
Pages (from-to)224-236
Number of pages13
JournalACS Catalysis
Volume13
Issue number1
DOIs
Publication statusPublished - 6 Jan 2023

Keywords

  • NO reduction by CO
  • Pt-based catalysts
  • SO tolerance
  • hydrotalcite-like oxide
  • negatively charged Pt atoms

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Ji, Y., Liu, S., Song, S., Xu, W., Li, L., Zhang, Y., Chen, W., Li, H., Jiang, J., Zhu, T., Li, Z., Zhong, Z., Wang, D., Xu, G., & Su, F. (2023). Negatively Charged Single-Atom Pt Catalyst Shows Superior SO2 Tolerance in NOx Reduction by CO. ACS Catalysis, 13(1), 224-236. https://doi.org/10.1021/acscatal.2c04918