Effects of HNO<sub>3</sub> modification on the mechanism of low temperature NO reduction over activated carbon

GUO Qian-qian; JING Wen; HOU Ya-qin; LIU Yong-jin; LI Feng-hai; HUANG Zhang-gen

doi:10.19906/j.cnki.JFCT.2021027

Volume 49 Issue 3

Mar. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(3): 387-394

GUO Qian-qian, JING Wen, HOU Ya-qin, LIU Yong-jin, LI Feng-hai, HUANG Zhang-gen. Effects of HNO3 modification on the mechanism of low temperature NO reduction over activated carbon[J]. Journal of Fuel Chemistry and Technology, 2021, 49(3): 387-394. doi: 10.19906/j.cnki.JFCT.2021027

Citation:

GUO Qian-qian, JING Wen, HOU Ya-qin, LIU Yong-jin, LI Feng-hai, HUANG Zhang-gen. Effects of HNO₃ modification on the mechanism of low temperature NO reduction over activated carbon[J]. Journal of Fuel Chemistry and Technology, 2021, 49(3): 387-394. doi: 10.19906/j.cnki.JFCT.2021027

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Effects of HNO₃ modification on the mechanism of low temperature NO reduction over activated carbon

doi: 10.19906/j.cnki.JFCT.2021027

1.
School of Chemistry and Chemical Engineering, Heze University, Heze 274015, China
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
3.
Shandong Yuhuang Chemical (Group) Co., Ltd, Heze 274500, China

Funds: The project was supported by National Key Research and Development Program (2017YFC0210203), National Natural Science Foundation of China (21902173 and 21978314), and the Key Research and Development Program of Shanxi Province (201703D11101804).

Received Date: 2020-10-30
Rev Recd Date: 2020-11-29

Available Online: 2021-03-19

Publish Date: 2021-03-19

Abstract

Abstract

To study the effects of HNO₃ modification on NO reduction over activated carbon (AC) at low temperatures, the AC was modified using HNO₃ at different temperatures. The activity of the resulted activated carbons towards NO reduction with NH₃ was investigated in a temperature range of 30−250 ℃. The temperature programmed desorption (TPD) and transient response experiments were used to study the mechanism of NO reduction. The results reveal that the NO conversion decreased with temperature at the initial stage and then kept stable. The adsorption of reactants was the rate-determining step. The increase of oxygen groups on the catalyst surface enhanced NH₃ adsorption. The adsorbed NH₃ hardly reacted with NO at 30 ℃. With increasing temperature, the adsorbed NH₃ was gradually activated. In the temperature range of 30−90 ℃, the adsorption of reactants was rate-determining step of NO reduction. When the temperature was higher than 90 ℃, the reaction was dominated by the activation of adsorbed NH₃.
- NO reduction,
- activated carbon,
- SCR,
- oxygen groups,
- HNO₃ modification

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References(28)

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