Performance of Adsorbents for NO2 in Furnace Flue Gas

doi:10.19691/j.cnki.1004-4493.2023.03.006

China's Refractories ›› 2023, Vol. 32 ›› Issue (3): 26-30.DOI: 10.19691/j.cnki.1004-4493.2023.03.006

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Performance of Adsorbents for NO₂ in Furnace Flue Gas

KONG Yuan¹, LI Xiang¹, FU Jie¹, YANG Lujun¹, WANG Anxiu¹, KANG Jialiang¹, SUO Dong², TIAN Shishuai², MA Chengliang^1,*

1 Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China;
2 Sanmenxia Electro-Melted Corundum Co., Ltd., Sanmenxia 472400, China

Online:2023-09-15 Published:2023-11-07
Contact: *e-mail: machengliang@zzu.edu.cn
About author:Kong Yuan, born in 1998, graduated from Henan Polytechnic University in 2022 with a bachelor’s degree in engineering. He is currently a master student at the School of Materials Science and Engineering, Zhengzhou University, conducting research under the guidance of Professor Ma Chengliang. At present, he mainly researches energy-saving materials for kilns.

Abstract

Abstract: To meet the emission standard of nitrogen oxides (NO_x) in the flue gas of batch furnaces through dry adsorption, a calcium-silica inorganic adsorbent was prepared with limestone and quartz as raw materials. Sample Cu-BTC 1^# was obtained by solvothermal synthesis, drying and purification in vacuum at 120 ℃ using trimesic acid (H₃BTC) and copper nitrate trihydrate (Cu(NO₃)₂·3H₂O) as raw materials; likewise, sample Cu-BTC 3^# was obtained at 200 ℃. Sample Cu-BTC 2^# was obtained by hydrothermal synthesis, drying and purification in air (metal-organic frameworks, 1,3,5-benzene tricarboxylic acid copper). The two types of materials were tested in terms of the NO₂ adsorption, and then the specific surface area, pore volume, NO₂ adsorption performance, phase composition, microstructure and thermal stability of the adsorbent materials were explored via N₂ physical adsorption-desorption, SEM, XRD and TG characterization. The results show that: (1) the Cu-BTC samples have higher adsorption capacity than the calcium-silica adsorbent, in which sample Cu-BTC 3^# has the largest specific surface area and pore volume, thus adsorption capacity for NO₂; (2) the calcium-silica adsorbent has better thermal stability and lower total mass loss during the entire process than the Cu-BTC samples; sample Cu-BTC 2^# has the best thermal stability among the three Cu-BTC samples, and the metal Cu active sites of the Cu-BTC samples can be exposed at least above 150 ℃.

Key words: nitrogen oxide (NO_x), Cu-BTC, calcium-silica inorganic adsorbent, adsorption capacity, specific surface area, thermal stability

KONG Yuan, LI Xiang, FU Jie, YANG Lujun, WANG Anxiu, KANG Jialiang, SUO Dong, TIAN Shishuai, MA Chengliang. Performance of Adsorbents for NO₂ in Furnace Flue Gas[J]. China's Refractories, 2023, 32(3): 26-30.

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Performance of Adsorbents for NO₂ in Furnace Flue Gas

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