NOx storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al2O3 catalyst using CH4 as reductant

Tao ZHU (竹涛); Xing ZHANG (张星); Nengjing YI (伊能静); Haibing LIU (刘海兵); Zhenguo LI (李振国)

doi:10.1088/2058-6272/abd620

Plasma Science and Technology > 2021 > 23(2): 25506-025506. > DOI: 10.1088/2058-6272/abd620

Tao ZHU (竹涛), Xing ZHANG (张星), Nengjing YI (伊能静), Haibing LIU (刘海兵), Zhenguo LI (李振国). NO_x storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al₂O₃ catalyst using CH₄ as reductant[J]. Plasma Science and Technology, 2021, 23(2): 25506-025506. DOI: 10.1088/2058-6272/abd620

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NO_x storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al₂O₃ catalyst using CH₄ as reductant

¹ Institute of Atmospheric Environmental Management and Pollution Control, China University of Mining & Technology (Beijing), Beijing 100083, People's Republic of China
² Solid Waste and Chemicals Management Technology Center, China Ministry of Ecology and Environment, Beijing 100029, People's Republic of China
³ National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, People's Republic of China
⁴ State Key Laboratory of Organic Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China

Funds: This work was supported by the National Engineering Laboratory for Mobile Source Emission Control Technology (No. NELMS2019A13), the National Key Research and Development Project of China (No. 2019YFC1805505), the Shanxi Province Bidding Project (No. 20191101007), the Major Science and Technology Projects of Shanxi Province (No. 20181102017), and State Key Laboratory of Organic Geochemistry (No. SKLOG -201909).

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Received Date: October 11, 2020
Revised Date: December 20, 2020
Accepted Date: December 21, 2020

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Abstract

Abstract

NO_x storage and reduction (NSR) technology has been regarded as one of the most promising strategies for the removal of nitric oxides (NOx) from lean-burn engines, and the potential of the plasma catalysis method for NO_xreduction has been confirmed in the past few decades. This work reports the NSR of nitric oxide (NO) by combining non-thermal plasma (NTP) and Co/Pt/Ba/γ-Al₂O₃ (Co/PBA) catalyst using methane as a reductant. The experimental results reveal that the NO_x conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150 °C–350 °C, and NO_x conversion of the 8% Co/PBA catalyst reaches 96.8% at 350 °C. Oxygen (O₂) has a significant effect on the removal of NO_x, and the NO_x conversion increases firstly and then decreases when the O₂ concentration ranges from 2% to 10%. Water vapor reduces the NO_x storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA catalysts. There is a negative correlation between sulfur dioxide (SO₂) and NO_x conversion in the NTP system, and the 8% Co/PBA catalyst exhibits higher NO_xconversion compared to other catalysts, which shows that Co has a certain SO₂ resistance.
- non-thermal plasma,
- NO_xstorage and reduction,
- Co/Pt/Ba/γ-Al₂O₃ catalystNO_x conversion,
- influence parameter

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NO_x storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al₂O₃ catalyst using CH₄ as reductant