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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

邮发代号 80-969

2019 Impact Factor: 3.552

Frontiers of Chemical Science and Engineering  2022, Vol. 16 Issue (10): 1476-1484   https://doi.org/10.1007/s11705-022-2165-z
  本期目录
NOx removal by non-thermal plasma reduction: experimental and theoretical investigations
Yue Liu1,2, Ji-Wei Wang1,2, Jian Zhang3, Ting-Ting Qi1,2, Guang-Wen Chu1,2(), Hai-Kui Zou1,2, Bao-Chang Sun1,2()
1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China
3. Daqing Refining & Chemical Company, PetroChina Co., Ltd., Daqing 163411, China
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Abstract

Green and efficient NOx removal at low temperature is still desired. NOx removal via non-thermal plasma (NTP) reduction is one of such technique. This work presents the experimental and theoretical study on the NOx removal via NTP reduction (NTPRD) in dielectric barrier discharge reactor (DBD). The effect of O2 molar fraction on NOx species in the outlet of DBD, and effects of NH3/NO molar ratio and discharge power of DBD on NOx removal efficiency are investigated. Results indicate that anaerobic condition and higher discharge power is beneficial to direct removal of NOx, and the NOx removal efficiency can be up to 98.5% under the optimal operating conditions. It is also found that adding NH3 is favorable for the reduction of NOx to N2 at lower discharge power. In addition, the NOx removal mechanism and energy consumption analysis for the NTPRD process are also studied. It is found that the reduced active species ( N, N, N+, N2, N H2+, etc.) generated in the NTPRD process play important roles for the reduction of NOx to N2. Our work paves a novel pathway for NOx removal from anaerobic gas in industrial application.

Key wordsx removal    NTP reduction    mechanism    energy consumption
收稿日期: 2021-10-06      出版日期: 2022-10-17
Corresponding Author(s): Guang-Wen Chu,Bao-Chang Sun   
 引用本文:   
. [J]. Frontiers of Chemical Science and Engineering, 2022, 16(10): 1476-1484.
Yue Liu, Ji-Wei Wang, Jian Zhang, Ting-Ting Qi, Guang-Wen Chu, Hai-Kui Zou, Bao-Chang Sun. NOx removal by non-thermal plasma reduction: experimental and theoretical investigations. Front. Chem. Sci. Eng., 2022, 16(10): 1476-1484.
 链接本文:  
https://academic.hep.com.cn/fcse/CN/10.1007/s11705-022-2165-z
https://academic.hep.com.cn/fcse/CN/Y2022/V16/I10/1476
Fig.1  
Fig.2  
Fig.3  
Fig.4  
Fig.5  
Fig.6  
Equation Free radical G/(molecules·100 eV–1)
N2 + e — N2* + e N2* 0.290
N2 + e — N* + N N*(2D) 0.885
N* (2P) 0.295
N* (4S) 1.18
N2 + e — N2+ + e N2+ 2.27
N2 + e — N+ + N + 2e N+ + N 0.69
O2 + e — O + O* + e O(3P) + O(1D) 1.82
O2 + e — O2* + e O2* 0.077
O2 + e — O2+ + 2e O(3P) + O* 0.180
O2 + e — O + O O(3P) + O+ + e 0.800
O2 + e — O + O O2+ + e 2.07
N2 (A) + O2 — O2* + N2 O(1D) + O+ + e 0.430
NH3 + e — NH + H2 + e NH 0.700
NH3 + H — NH2 + H2 NH2 5.40
Tab.1  
Species GAi/(molecules·100 eV–1) CAi/(molecules·cm–3)
N2* 0.290 2.43 × 1013
N* (2D) 0.885 7.42 × 1013
N* (2P) 0.295 2.47 × 1013
N* (4S) 1.18 9.89 × 1013
N2+ 2.27 1.90 × 1014
N+ + N 0.690 5.78 × 1013
NH 0.700 2.54 ×1011
NH2 5.40 1.96× 1012
O(3P) + O(1D) 1.82 1.15 × 1013
O2* 0.077 4.88 × 1011
O(3P) + O* 0.180 1.14 × 1012
O(3P) + O+ + e 0.800 5.07 × 1012
O(1D) + O+ + e 0.430 2.73 × 1012
O2+ + e 2.07 1.31× 1013
Tab.2  
Species GAi/(molecules·100 eV–1) CAi/(molecules·cm–3)
N2* 0.290 2.61 × 1013
N*(2D) 0.885 7.98 × 1013
N*(2P) 0.295 2.66 × 1013
N*(4S) 1.18 1.06 × 1014
N2+ 2.27 2.05 × 1014
N+ + N 0.690 6.22 × 1013
NH 0.700 2.54 × 1011
NH2 5.40 1.96 × 1012
Tab.3  
No. Main reaction ki /(cm3·s–1) [23,33,37]
1 N+ + NO — NO+ + N 4.10 × 10–10
2 N+ + NO — N2+ + O 5.00 × 10–11
3 O2+ + NO — NO+ + O2 3.50 × 10–10
4 NO + O+ — NO+ + O 1.00 × 10–12
5 N2* + NO — N2 + NO 1.50 × 10–10
6 N* + NO — N2 + O 7.00 × 10–11
7 NO + N — N2 + O 3.25 × 10–11
8 NO + NH2 — N2 + H2O 10−6 × T–1.96 a)
9 NO + NH2 — N2H + OH 5.15 × 10–11
10 NO + NH — N2 + OH 5.15 × 10–11
11 NO + O — NO2 1.00 × 10–31
12 O* + NO — N + O2 1.70 × 10–10
13 N* + O2 — NO + O 2.00 × 10–12
Tab.4  
No. Main reaction ki/(cm3·s–1) CAi/(mol·cm–3) Ri/(mol·s–1·cm–3) Si
1 N+ + NO — NO+ + N 4.10 × 10–10 9.60 × 10–11 1.41 × 10–27 0.2696
2 N+ + NO — N2+ + O 5.00 × 10–11 9.60 × 10–11 1.71 × 10–28 0.0329
3 O2+ + NO — NO+ + O2 3.50 × 10–10 2.18 × 10–11 2.72 × 10–28 0.0522
4 NO + O+ — NO+ + O 1.00 × 10–12 1.30 × 10–11 4.63 × 10–31 0.0001
5 N2* + NO — N2 + NO 1.50 × 10–10 4.04 × 10–11 2.16 × 10–28 0.0415
6 N* + NO — N2 + O 7.00 × 10–11 3.28 × 10–10 8.21 × 10–28 0.1574
7 NO + N — N2 + O 3.25 × 10–11 9.60 × 10–11 1.11 × 10–28 0.0214
8 NO + NH2 — N2 + H2O 1.40 × 10–11 3.25 × 10–12 1.62 × 10–30 0.0003
9 NO + NH2 — N2H + OH 5.15 × 10–11 3.25 × 10–12 5.98 × 10–30 0.0011
10 NO + NH — N2 + OH 5.15 × 10–11 4.21 × 10–13 7.75 × 10–31 0.0001
11 NO + O — NO2 1.00 × 10–31 2.95 × 10–11 1.05 × 10–49 0.0000
12 O* + NO — N + O2 1.70 × 10–10 2.56 × 10–11 1.55 × 10–28 0.0298
13 N* + O2 — NO + O 2.00 × 10–12 3.28 × 10–10 2.05 × 10–28 0.3936
Tab.5  
No. Main reaction ki/(cm3·s–1) CAi/(mol·cm–3) Ri/(mol·s–1·cm–3) Si
1 N+ + NO — NO+ + N 4.10 × 10–10 1.03 × 10–10 1.51 × 10–27 0.5143
2 N* + NO — N2+ + O 7.00 × 10–11 3.53 × 10–10 8.83 × 10–28 0.3003
3 N2* + NO — N2 + NO 1.50 × 10–10 4.34 × 10–11 2.33 × 10–28 0.0791
4 N+ + NO — N2+ + O 5.00 × 10–11 1.03 × 10–10 1.84 × 10–28 0.0627
5 NO + N — N2 + O 3.25 × 10–11 1.03 × 10–10 1.20 × 10–28 0.0408
6 NO + NH2 — N2H + OH 5.15 × 10–11 3.25 × 10–12 5.98 × 10–30 0.0020
7 NO + NH2 — N2 + H2O 1.40 × 10–11 3.25 × 10–12 1.62 × 10–30 0.0006
8 NO + NH — N2 + OH 5.15 × 10–11 4.21 × 10–13 7.75 × 10–31 0.0003
Tab.6  
Fig.7  
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