Transformation of functional groups in the reduction of NO with NH3 over nitrogen-enriched activated carbons
Lin, Yuting; Li, Yuran; Xu, Zhicheng; Xiong, Jin; Zhu, Tingyu
2018-07-01
发表期刊FUEL
ISSN0016-2361
卷号223页码:312-323
摘要In recent years, activated carbon technology has been applied in various industrial flue gas purifications, with a high desulfurization efficiency but a relatively low denitrification efficiency. To strengthen the denitrification performance and further clarify which physicochemical property factor dominates the reduction of NO over activated carbon, this study used four kinds of nitrogen-enriched additives to modify the activated carbon, and the denitrification efficiency increased. The results from porosity analysis and Raman spectra showed that modification reduced the specific surface area and total pore volume of the activated carbon but promoted the disorder of graphite microcrystalline structure providing the adsorption and reaction active center for NO and NH3. The oxygen-containing and nitrogen-containing functional groups were detected by X-ray photoelectron spectrometry before and after the reaction. The results revealed that the phenolic hydroxyl oxygen was transformed to carbonyl oxygen of quinone, and pyridine, pyrrole and quaternary nitrogen functional groups were converted to pyridine N-oxides and amines. The transient response experiment was employed to investigate the adsorption state of NO and NH3 in denitrification reaction by abruptly cutting off the intake of NO or NH3 under steady-state reaction. The results revealed that the reduction of NO with NH3 at 110 degrees C follows the Langmuir-Hinshelwood (L-H) mechanism, while at 150 degrees C with Elay-Rideal (E-R) mechanism and L-H mechanism. The pyridine, pyrrole and quaternary amine groups can adsorb NO in the gaseous state, and the phenolic hydroxyl group acts as the adsorption site of NH3 to produce quinones and N-2 and complete the SCR reaction.
关键词Activated Carbon Denitrification Functional Groups Modification
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.fuel.2018.01.092
收录类别SCI
语种英语
关键词[WOS]CHEMICAL ACTIVATION ; CATALYTIC-PROPERTIES ; BROWN-COAL ; OXIDATION ; DECOMPOSITION ; AMMOXIDATION ; SPECTROSCOPY ; ADSORPTION ; PLASMA ; H2SO4
WOS研究方向Energy & Fuels ; Engineering
WOS类目Energy & Fuels ; Engineering, Chemical
项目资助者National Key R&D Program of China(2017YFC0210602 ; Beijing Science and Technology Project(D161100004516001) ; 2017YFC0210203)
WOS记录号WOS:000429423700029
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/24195
专题湿法冶金清洁生产技术国家工程实验室
作者单位Chinese Acad Sci, Inst Proc Engn, Beijing Engn Res Ctr Proc Pollut Control, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
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Lin, Yuting,Li, Yuran,Xu, Zhicheng,et al. Transformation of functional groups in the reduction of NO with NH3 over nitrogen-enriched activated carbons[J]. FUEL,2018,223:312-323.
APA Lin, Yuting,Li, Yuran,Xu, Zhicheng,Xiong, Jin,&Zhu, Tingyu.(2018).Transformation of functional groups in the reduction of NO with NH3 over nitrogen-enriched activated carbons.FUEL,223,312-323.
MLA Lin, Yuting,et al."Transformation of functional groups in the reduction of NO with NH3 over nitrogen-enriched activated carbons".FUEL 223(2018):312-323.
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