Plasma-enhanced low temperature NH<sub>3</sub>-SCR of NO<sub>x</sub> over a Cu-Mn/SAPO-34 catalyst under oxygen-rich conditions


Jiang, Boqiong, Zhao, Shuang, Wang, Yaolin ORCID: 0000-0003-1932-9810, Wenren, Yesheng, Zhu, Zuchao, Harding, Jonathan ORCID: 0000-0002-9920-7831, Zhang, Xinglin, Tu, Xin ORCID: 0000-0002-6376-0897 and Zhang, Xuming (2021) Plasma-enhanced low temperature NH<sub>3</sub>-SCR of NO<sub>x</sub> over a Cu-Mn/SAPO-34 catalyst under oxygen-rich conditions. APPLIED CATALYSIS B-ENVIRONMENTAL, 286. p. 119886. ISSN 0926-3373, 1873-3883

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Abstract

In this work, a dielectric barrier discharge (DBD) plasma-enhanced NH<inf>3</inf>-selective catalytic reduction (NH<inf>3</inf>-SCR) of NO<inf>x</inf> over a Cu-Mn/SAPO-34 catalyst at low temperatures (<200 °C) and oxygen-rich conditions (14 vol.%) has been investigated using a two-stage post-plasma-catalytic (PPC) configuration. The results show a maximum NO<inf>x</inf> removal of 80 % and a 100 % N<inf>2</inf> selectivity without NH<inf>3</inf> slip or the formation of by-products at a low specific energy input (SEI) of 32 J/L. Adding water vapor (5.7 vol.%) into the plasma NH<inf>3</inf>-SCR process does not negatively affect the removal of NO<inf>x</inf>, while the presence of C<inf>3</inf>H<inf>6</inf> enhances the removal of NO<inf>x</inf>. In situ diffuse reflectance infrared spectroscopy (DRIFTS) combined with optical emission spectroscopic diagnostics has been employed to elucidate the reaction mechanism in the plasma-catalytic removal of NO<inf>x</inf>. We find that the formation of NO<inf>2</inf> via NO oxidation in the first stage plasma gas-phase reaction enhances the Eley-Rideal (E–R) reaction on the surface of the Cu-Mn/SAPO-34 catalyst in the second stage catalytic NH<inf>3</inf>-SCR of NO<inf>x</inf>. The Cu-Mn/SAPO-34 catalyst shows stable performance in the plasma-enhanced NH<inf>3</inf>-SCR of NO<inf>x</inf> after 5 cycles of catalyst regeneration. This work has successfully demonstrated a promising low-temperature plasma-catalytic solution for the effective NH<inf>3</inf>-SCR of NO<inf>x</inf>.

Item Type: Article
Uncontrolled Keywords: Plasma catalysis, Cu-Mn/SAPO-34, Diesel exhaust gases, NH3-Selective catalytic reduction, Reaction mechanism
Depositing User: Symplectic Admin
Date Deposited: 11 Jan 2021 09:55
Last Modified: 12 Jun 2025 01:24
DOI: 10.1016/j.apcatb.2021.119886
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3113085
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