On the Nature of Nitrogen-Containing Groups in the SCR of NO Over Functionalized Activated Coke

Li, Yuran; Lin, Yu‐Ting; Cheng, Chungui; Hao, Junke; Zhu, Tong

doi:10.1007/s12649-018-0428-1

Cited by 14 publications

(7 citation statements)

References 34 publications

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“…Modifying the AC can increase its nitrogen content, as shown in Table . In previous studies, nitrogen‐containing groups on the surface of AC were classified into two categories: active groups, and non‐active groups . Active groups, including pyridine (N‐6), pyrrole (N‐5), and quaternary nitrogen (N + ), played a catalytic role in the denitrification process .…”

Section: Results and Disscussionmentioning

confidence: 99%

“…In previous studies, nitrogen‐containing groups on the surface of AC were classified into two categories: active groups, and non‐active groups . Active groups, including pyridine (N‐6), pyrrole (N‐5), and quaternary nitrogen (N + ), played a catalytic role in the denitrification process . During the denitrification reaction, the active groups could be partially converted into non‐active groups, including amine, nitro, P‐NO, and nitrate.…”

Section: Results and Disscussionmentioning

confidence: 99%

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Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Meng

Cheng

et al. 2020

Can J Chem Eng

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Low-rank activated coke (AC) is widely used for industrial flue gas purification due to its multipollutant cooperative removal capability. To enhance the denitrification capacity of AC for the selective catalytic reduction (SCR) of NO with NH 3 , several transition metal (Fe, Mn, Ce, V) oxides were uniformly loaded into AC by solvent impregnation. Compared to untreated AC, modified AC showed excellent denitrification efficiency above 90%. N 2 adsorptiondesorption and Raman spectroscopy techniques were used to characterize the pore size distribution and crystal structure of AC samples. The introduction of transition metal oxides had little effect on the pore structure of AC but increased the nitrogen-containing functional groups, which facilitated NO removal. Moreover, x-ray photoelectron spectroscopy (XPS) was used to analyze the valence changes of metal elements before and after denitrification.After the reaction, the content increase of the low-valence metal oxides indicated that the transition metal oxides were involved in the reaction of NO with NH 3 . High-valence metal oxides oxidized NO to NO 2 , which reacts more easily with NH 3 , thereby increasing the denitrification efficiency. Importantly, in the presence of SO 2 , modified AC still presented high denitrification performance.This transition metal oxides doping method can effectively improve the ability of low-rank AC to remove NO in multi-contaminant flue gas. K E Y W O R D Sactivated coke, denitrification, flue gas, SCR, transition metal oxides

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Section: Results and Disscussionmentioning

confidence: 99%

Section: Results and Disscussionmentioning

confidence: 99%

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Meng

Cheng

et al. 2020

Can J Chem Eng

Self Cite

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“…At present, selective catalytic reduction (SCR) and selective non‐catalytic reduction (SNCR) are still widely used NO x removal strategies in industry 14–16. Li et al applied a low‐rank activated coke (AC) with ammonia (NH 3 ·H 2 O) solution or nitric acid (HNO 3 ) solution to increase the content and type of nitrogen‐containing functional groups via SCR 14. Zhao et al investigated the mechanism of the effect of HCl and CO on nitrogen oxide formation within the temperature window of SNCR 15.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are still some problems. In the SCR method, the catalyst is easy to deactivate during the reaction process, and the reducing agent (NH 3 ) leakage and the intermediate product (N 2 O) emission cause secondary pollution 14, 15. The reaction temperature of SNCR method is usually above 800 °C, resulting in high energy consumption 16.…”

Section: Introductionmentioning

confidence: 99%

Pilot Plant Evaluation of NO_x Removal by Cobalt Ethylenediamine Solution

et al. 2022

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The removal of NOx by cobalt ethylenediamine solution has attracted much attention, but its reaction mechanism is still not clear. In this study, the reaction mechanism was analyzed experimentally and through practical engineering experiments for thirteen consecutive days. The results indicate that the removal of NOx by cobalt ethylenediamine solution can be divided into two steps. For industrial applications, the removal of actual flue gas NO by cobalt ethylenediamine absorbent was investigated by a gas‐liquid countercurrent and concurrent system in a glass fiber factory in Neijiang, Sichuan province in China, indicating that the average removal efficiency of NO and NOx reached 80 % and that of SO2 90 %.

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“…Usually, denitrification is to convert the NO x in the flue gas into NO 2 -or NO 3 -and other non-gaseous states. Some of the popular methods for the denitrification of exhaust gases include selective catalytic and noncatalytic reduction, adsorption-based methods, and plasma-based methods [13,14]. Apart from wet denitration, several new technologies have been developed, such as complexation absorption, oxidation absorption, reduction absorption, and biological methods [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO_x Remediation in Flue Gas

Yang

Liu

et al. 2021

Chem Eng & Technol

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Cobalt ethylenediamine ([Co(en) 3 ] 3+ ) is widely used for NO x remediation in flue gas. However, its industrial applications are limited due to the lack of an efficient regeneration method that converts Co 3+ to Co 2+ . Here, hydrogen chloride is applied as an additive and the performance of cobalt ethylenediamine under variable flue gas compositions is analyzed. The results demonstrate that low pH values favor the conversion of Co 3+ to Co 2+ . Further, a reaction temperature of 100°C and more than three minutes reaction time were found to accelerate the reduction of Co 3+ . The NO x removal efficiency could reach more than 70 % after the first regeneration. After 23 consecutive days of continuous experiments, the denitration efficiency of flue gas could be as high as 60 % or more.

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On the Nature of Nitrogen-Containing Groups in the SCR of NO Over Functionalized Activated Coke

Cited by 14 publications

References 34 publications

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Pilot Plant Evaluation of NO_x Removal by Cobalt Ethylenediamine Solution

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO_x Remediation in Flue Gas

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On the Nature of Nitrogen-Containing Groups in the SCR of NO Over Functionalized Activated Coke

Cited by 14 publications

References 34 publications

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Pilot Plant Evaluation of NOx Removal by Cobalt Ethylenediamine Solution

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NOx Remediation in Flue Gas

Contact Info

Product

Resources

About

Pilot Plant Evaluation of NO_x Removal by Cobalt Ethylenediamine Solution

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO_x Remediation in Flue Gas