Remarkable N-2-selectivity enhancement of practical NH3-SCR over Co0.5Mn1Fe0.25Al0.75Ox-LDO: The role of Co investigated by transient kinetic and DFT mechanistic studies

doi:10.1016/j.apcatb.2020.119186

	Remarkable N-2-selectivity enhancement of practical NH3-SCR over Co0.5Mn1Fe0.25Al0.75Ox-LDO: The role of Co investigated by transient kinetic and DFT mechanistic studies
	Chen, Sining 1; Vasiliades, Michalis A.2; Yan, Qinghua 3; Yang, Guangpeng 4; Du, Xuesen 4; Zhang, Cheng 1; Li, Yuran 5; Zhu, Tingyu 5; Wang, Qiang 1; Efstathiou, Angelos M.2
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2020-11-15
卷号	277 页码:19
关键词	LDHs NH3-SCR MnOx-based catalyst Co-based NH3-SCR Transient kinetics
ISSN号	0926-3373
DOI	10.1016/j.apcatb.2020.119186
英文摘要	A Co0.5Mn1Fe0.25Al0.75Ox-LDO catalyst was developed which showed excellent performance for the low-temperature NH3-SCR. NOx conversions 100% were achieved in the whole 100-250 degrees C range, while after 10-h operation at 150 degrees C with 100 ppm SO2/5 vol% H2O in the feed, the NOx conversion was maintained at 80%. This catalyst provided a much better N-2-selectivity than the Mn1Fe0.25Al0.75Ox-LDO and Mn1Al1Ox-LDO, especially at 150-300 degrees C. It was found that Co0.5Mn1Fe0.25Al0.75Ox possessed higher surface acidity and reducibility, while XPS analyses indicated an electron transfer between Co3+/Co2+ and Mn4+/Mn3+ redox cycles, leading to a much lower N2O formation, supported by Density Functional Theory (DFT) calculations. Detailed analysis of gas responses obtained upon various step-gas switches was performed, which allowed to measure the surface concentration and reactivity of preadsorbed NOx-s and NHx-s leading to N-2 and N2O. Transient kinetic and DFT studies strongly suggested likely mechanisms of NH3-SCR and the critical role of Co for N-2-selectivity enhancement.
资助项目	Fundamental Research Funds for the Central Universities[2019JQ03015] ; National Natural Science Foundation of China[U1810209] ; Beijing Municipal Education Commission through the Innovative Transdisciplinary Program "Ecological Restoration Engineering" ; Research Committee of the University of Cyprus
WOS关键词	SELECTIVE CATALYTIC-REDUCTION ; LOW-TEMPERATURE NH3-SCR ; INITIO MOLECULAR-DYNAMICS ; LAYERED DOUBLE HYDROXIDE ; OXIDE-BASED CATALYSTS ; MIXED-OXIDE ; NITRIC-OXIDE ; SULFUR RESISTANCE ; REACTION PATHWAYS ; N-2 SELECTIVITY
WOS研究方向	Chemistry ; Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000552015900023
资助机构	Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; Beijing Municipal Education Commission through the Innovative Transdisciplinary Program "Ecological Restoration Engineering" ; Research Committee of the University of Cyprus
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/41502]
专题	中国科学院过程工程研究所
通讯作者	Wang, Qiang; Efstathiou, Angelos M.
作者单位	1.Beijing Forestry Univ, Coll Environm Sci & Engn, 35 Qinghua East Rd, Beijing 100083, Peoples R China 2.Univ Cyprus, Heterogeneous Catalysis Lab, Chem Dept, 1 Univ Ave,Univ Campus, CY-2109 Nicosia, Cyprus 3.Qingdao Agr Univ, Coll Resource & Environm, Qingdao 266109, Peoples R China 4.Chongqing Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China 5.Chinese Acad Sci, Res Ctr Proc Pollut Control, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Chen, Sining,Vasiliades, Michalis A.,Yan, Qinghua,et al. Remarkable N-2-selectivity enhancement of practical NH3-SCR over Co0.5Mn1Fe0.25Al0.75Ox-LDO: The role of Co investigated by transient kinetic and DFT mechanistic studies[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2020,277:19.
APA	Chen, Sining.,Vasiliades, Michalis A..,Yan, Qinghua.,Yang, Guangpeng.,Du, Xuesen.,...&Efstathiou, Angelos M..(2020).Remarkable N-2-selectivity enhancement of practical NH3-SCR over Co0.5Mn1Fe0.25Al0.75Ox-LDO: The role of Co investigated by transient kinetic and DFT mechanistic studies.APPLIED CATALYSIS B-ENVIRONMENTAL,277,19.
MLA	Chen, Sining,et al."Remarkable N-2-selectivity enhancement of practical NH3-SCR over Co0.5Mn1Fe0.25Al0.75Ox-LDO: The role of Co investigated by transient kinetic and DFT mechanistic studies".APPLIED CATALYSIS B-ENVIRONMENTAL 277(2020):19.