Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon

Abstract An exceptional phenomenon has been observed that SO2 and NO x in flue gas can be effectively adsorbed over activated carbon with a surprising capacity at cold temperatures with the presence of oxygen. In this study, the adsorption characteristics of NO and SO2 over activated carbon at 80, 2...

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Autores principales:	Shiqing Wang, Shisen Xu, Shiwang Gao, Ping Xiao, Minhua Jiang, He Zhao, Bin Huang, Lianbo Liu, Hongwei Niu, Jinyi Wang, Dongfang Guo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/baa711f3cb33463ba866069d4933c9f3
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spelling	oai:doaj.org-article:baa711f3cb33463ba866069d4933c9f32021-12-02T14:42:01ZSimultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon10.1038/s41598-021-90532-92045-2322https://doaj.org/article/baa711f3cb33463ba866069d4933c9f32021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90532-9https://doaj.org/toc/2045-2322Abstract An exceptional phenomenon has been observed that SO2 and NO x in flue gas can be effectively adsorbed over activated carbon with a surprising capacity at cold temperatures with the presence of oxygen. In this study, the adsorption characteristics of NO and SO2 over activated carbon at 80, 20, 0, and − 20 is experimentally investigated. Without the presence of oxygen, adsorption of NO is negligible. In the presence of oxygen, NO can be oxidized to NO2 over activated carbon which leads to the co-adsorption of NO/NO2 within the adsorption bed. Catalytic oxidation of NO over activated carbon can be significantly enhanced at cold temperatures, leading to an extraordinary increase of adsorption capacity of NO. With an initial concentration of NO = 200 ppmv and a space velocity of 5000 h−1, the average specific capacity increases from 3.8 to 169.1 mg/g when the temperature decreases from 80 to – 20 ℃. For NO–O2 co-adsorption, the specific capacity increases along the adsorption bed due to the increasing NO2 concentrations. The adsorption capacity of SO2 is also significantly enhanced at cold temperatures. With an initial concentration of SO2 = 1000 ppmv, the specific capacity increases from 12.9 to 123.1 mg/g when the temperature decreases from 80 to – 20 ℃. A novel low-temperature adsorption (LAS) process is developed to simultaneously remove SO2 and NO x from flue gas with a target of near-zero emission. A pilot-scale testing platform with a flue gas flowrate of 3600 Nm3/h is developed and tested. Emission of both SO2 and NO x is less than 1 ppmv, and the predicted energy penalty is about 3% of the net generation.Shiqing WangShisen XuShiwang GaoPing XiaoMinhua JiangHe ZhaoBin HuangLianbo LiuHongwei NiuJinyi WangDongfang GuoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shiqing Wang Shisen Xu Shiwang Gao Ping Xiao Minhua Jiang He Zhao Bin Huang Lianbo Liu Hongwei Niu Jinyi Wang Dongfang Guo Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon
description	Abstract An exceptional phenomenon has been observed that SO2 and NO x in flue gas can be effectively adsorbed over activated carbon with a surprising capacity at cold temperatures with the presence of oxygen. In this study, the adsorption characteristics of NO and SO2 over activated carbon at 80, 20, 0, and − 20 is experimentally investigated. Without the presence of oxygen, adsorption of NO is negligible. In the presence of oxygen, NO can be oxidized to NO2 over activated carbon which leads to the co-adsorption of NO/NO2 within the adsorption bed. Catalytic oxidation of NO over activated carbon can be significantly enhanced at cold temperatures, leading to an extraordinary increase of adsorption capacity of NO. With an initial concentration of NO = 200 ppmv and a space velocity of 5000 h−1, the average specific capacity increases from 3.8 to 169.1 mg/g when the temperature decreases from 80 to – 20 ℃. For NO–O2 co-adsorption, the specific capacity increases along the adsorption bed due to the increasing NO2 concentrations. The adsorption capacity of SO2 is also significantly enhanced at cold temperatures. With an initial concentration of SO2 = 1000 ppmv, the specific capacity increases from 12.9 to 123.1 mg/g when the temperature decreases from 80 to – 20 ℃. A novel low-temperature adsorption (LAS) process is developed to simultaneously remove SO2 and NO x from flue gas with a target of near-zero emission. A pilot-scale testing platform with a flue gas flowrate of 3600 Nm3/h is developed and tested. Emission of both SO2 and NO x is less than 1 ppmv, and the predicted energy penalty is about 3% of the net generation.
format	article
author	Shiqing Wang Shisen Xu Shiwang Gao Ping Xiao Minhua Jiang He Zhao Bin Huang Lianbo Liu Hongwei Niu Jinyi Wang Dongfang Guo
author_facet	Shiqing Wang Shisen Xu Shiwang Gao Ping Xiao Minhua Jiang He Zhao Bin Huang Lianbo Liu Hongwei Niu Jinyi Wang Dongfang Guo
author_sort	Shiqing Wang
title	Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon
title_short	Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon
title_full	Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon
title_fullStr	Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon
title_full_unstemmed	Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon
title_sort	simultaneous removal of so2 and no x from flue gas by low-temperature adsorption over activated carbon
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/baa711f3cb33463ba866069d4933c9f3
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Simultaneous removal of SO2 and NO x from flue gas by low-temperature adsorption over activated carbon

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