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An efficient and sulfur resistant K-modified activated carbon for SCR denitrification compared with acid- and Cu-modified activated carbon
Xu, Zhicheng1,2; Li, Yuran1; Guo, Junxiang1; Xiong, Jin1,2; Lin, Yuting1; Zhu, Tingyu1,3
2020-09-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume395Pages:13
Abstract

In this work and for the first time, an alkali metal potassium (K) as a promoter was loaded on an activated carbon (AC) to be used for selective catalytic reduction of NO from industrial flue gas. The denitrification activity of K-modified AC samples was investigated and compared with those of acid- and Cu-modified AC samples. The three modifications can enhance the denitrification activity of AC samples. To investigate the enhanced mechanisms of denitrification and SO2 resistance, various AC samples were characterized by SEM, EDX, XRF, ICP, XRD, N-2 physisorption, H-2-TPR, XPS, in situ DRIFTS and TPD. For the acid modification, the content of phenolic hydroxyl increases and then promotes the adsorption of NH3. For the loading of Cu, the appearance of Cu2+/Cu+ sites with high catalytic activity promotes NH3 and NO adsorption and changes the reaction pathway. For the loading of K, the adsorption capacity for NO increases nearly 12 times higher than that on Raw-AC, of which 85.0% is chemical adsorption. Moreover, three kinds of active nitrate species additionally forms, including nitro compounds, monodentate nitrate and nitrous oxide, which promote the denitrification reaction path. AC-Cu has poor sulfur resistance due to the sulfation of Cu, while AC-K show good sulfur resistance due to the enhanced adsorption of NO. The catalytic dissociation activity of N2O on AC-K makes the formation and decomposition of N2O into a dynamic equilibrium. As a result, AC-K has a high N-2 selectivity, while AC-Cu has poor N2 selectivity.

KeywordFlue Gas Denitrification Activated Carbon Alkali Metal Potassium Transition Metal Copper So2 Resistance
DOI10.1016/j.cej.2020.125047
Language英语
WOS KeywordSelective Catalytic-reduction ; Nox Storage Performance ; Low-temperature Scr ; Al Mixed-oxide ; Adsorptive Desulfurization ; N2o Decomposition ; Moco Catalysts ; Nh3 ; Removal ; Surface
Funding ProjectNational Key R&D Program of China[2017YFC0210600] ; National Natural Science Foundation of China[U1810209] ; National Research Program for Key Issues in Air Pollution Control[DQGG0202]
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
Funding OrganizationNational Key R&D Program of China ; National Natural Science Foundation of China ; National Research Program for Key Issues in Air Pollution Control
WOS IDWOS:000537387000006
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/40895
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Yuran; Zhu, Tingyu
Affiliation1.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
Recommended Citation
GB/T 7714
Xu, Zhicheng,Li, Yuran,Guo, Junxiang,et al. An efficient and sulfur resistant K-modified activated carbon for SCR denitrification compared with acid- and Cu-modified activated carbon[J]. CHEMICAL ENGINEERING JOURNAL,2020,395:13.
APA Xu, Zhicheng,Li, Yuran,Guo, Junxiang,Xiong, Jin,Lin, Yuting,&Zhu, Tingyu.(2020).An efficient and sulfur resistant K-modified activated carbon for SCR denitrification compared with acid- and Cu-modified activated carbon.CHEMICAL ENGINEERING JOURNAL,395,13.
MLA Xu, Zhicheng,et al."An efficient and sulfur resistant K-modified activated carbon for SCR denitrification compared with acid- and Cu-modified activated carbon".CHEMICAL ENGINEERING JOURNAL 395(2020):13.
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