Adsorbents for the adsorption purification of NO<sub><i>x</i></sub> in the ore-sintering flue gas

LIU Ying-shu; WU Xiao-yong; LI Zi-yi; YANG Xiong; LIU Wen-hai; HOU Huan-yu; XING Yi; LI Jin-juan

doi:10.13374/j.issn2095-9389.2021.11.01.001

Volume 44 Issue 11

Nov. 2022

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Article Navigation > Chinese Journal of Engineering > 2022 > 44(11): 1860-1867

LIU Ying-shu, WU Xiao-yong, LI Zi-yi, YANG Xiong, LIU Wen-hai, HOU Huan-yu, XING Yi, LI Jin-juan. Adsorbents for the adsorption purification of NOx in the ore-sintering flue gas[J]. Chinese Journal of Engineering, 2022, 44(11): 1860-1867. doi: 10.13374/j.issn2095-9389.2021.11.01.001

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LIU Ying-shu, WU Xiao-yong, LI Zi-yi, YANG Xiong, LIU Wen-hai, HOU Huan-yu, XING Yi, LI Jin-juan. Adsorbents for the adsorption purification of NO_x in the ore-sintering flue gas[J]. Chinese Journal of Engineering, 2022, 44(11): 1860-1867. doi: 10.13374/j.issn2095-9389.2021.11.01.001

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Adsorbents for the adsorption purification of NO_x in the ore-sintering flue gas

doi: 10.13374/j.issn2095-9389.2021.11.01.001

1.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
HBIS Technology Research InstituteInstitute, Shijiazhuang 050023, China
3.
College of Resources and Environmental Engineering, Key Laboratory of Karst Georesources and Environment (Ministry of Education), Guizhou University, Guiyang 550025, China

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Corresponding author: E-mail: ziyili@ustb.edu.cn
Received Date: 2021-11-01
Available Online: 2022-02-22
Publish Date: 2022-11-01

Abstract

Abstract

Nitrogen oxides (NO_x) are major air pollutants produced by fuel combustion that cause adverse effects on the environment and human health. The deep purification of NO_x from ?ue gases has become a worldwide issue. In China, a rigorous ultra-low emission standard (ULES) of NO_x≤ 50 mg·m^–3 has been implemented in the power and steel industries in recent years. NO₂ is a valuable chemical feedstock that is worthy of being recycled from flue gas. Adsorption is a promising technology that can achieve deep purification and resource recovery of NO_x from industrial flue gas, in which a high-performance NO_x adsorbent plays a key role. However, a systematic understanding of NO_x adsorbents for practical applications is still lacking. This study compares and analyzes the NO_x adsorption and desorption performances of typical practical adsorbents including zeolites, metal oxides, and silica-alumina gels based on the practical need for both NO_x purification efficacy and material thermal stability. NO_x adsorption capacities, breakthrough curves, uptake curves, and temperature-programmed desorption (TPD) curves were also measured. Results show that compared to Fe–Mn–Ce and 13X as competitive adsorbents, H-ZSM-5_25 showed NO_x deep purification (purification efficiency close to 100% before adsorption breakthrough), great NO_x adsorption capacity (0.206 mmol·g^–1), and high NO₂ concentration ratio in desorption, which are likely due to its high NO catalytic oxidation rate and comparable NO₂ physical adsorption rate. Regarding the desorption characteristics, H-ZSM-5_25 showed a bimodal TPD desorption peak with a lower desorption temperature (400–470 K) in the low-temperature region. Meanwhile, NO₂ is the primary NO_x component in the desorbed gas (adsorption-desorption enrichment ratio of NO₂ being up to 57), which can easily be recovered using the liquefaction method. Furthermore, by comparing the adsorption performances on the H-ZSM-5 with different silica-to-alumina ratios, the NO_x adsorption was found to decrease (from 0.706 to 0.206 mmol·g^–1 for H-ZSM-5_25 and from 0.454 to 0.127 mmol·g^–1 for H-ZSM-5_38) with increasing temperature (298–398 K). The dependence of the NO₂ adsorption on the temperature was more significant for H-ZSM-5_25 compared to H-ZSM-5_38. Compared to H-ZSM-5_38, H-ZSM-5_25 with a lower silica-to-alumina ratio (consequently, more cation sites) rendered greater NO oxidation performance, a potentially higher NO₂ adsorption capacity, and a greater decreasing trend of the adsorption capacity with increasing temperature. Results of adsorption kinetic experiments showed that the NO_x mass transfer parameters on H-ZSM-5_25 were lower than those on H-ZSM-5_38 with a smaller primary micro pore channel. Results of the current work can provide technical references for economic flue gas denitrification.
- flue gas purification,
- nitrogen oxide,
- adsorbent,
- adsorption,
- recovery

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References(42)

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