Catalytic ignition of CO over CuCeZr based catalysts: New insights into the support effects and reaction pathways

doi:10.1016/j.apcatb.2023.122435

	Catalytic ignition of CO over CuCeZr based catalysts: New insights into the support effects and reaction pathways
	Kang RN(康润宁); Zhang ZR(张梓睿); Bin F(宾峰); Wei XL(魏小林); Li, Yongdan ; Chen, Guoxing ; Tu, Xin
发表期刊	APPLIED CATALYSIS B-ENVIRONMENTAL
	2023-07-15
卷号	327 页码:122435
ISSN	0926-3373
摘要	Self-sustained catalytic combustion is a promising strategy to remove CO from the off-gas produced during steelmaking, where the potential catalysts are bulk copper-cerium-zirconium mixed oxides or those supported on TiO2 or ZSM-5 substrates. In this study, the effects of the catalyst support on the CO catalytic ignition perfor-mance and reaction pathways were investigated by FTIR coupled with a novel in-situ cell, together with the state-of-the-art characterization techniques. The Infrared (IR) transmission cell equipped with a magnetically driven system, could effectively prevent overlaps between active intermediate peaks (Cu+-CO and Cu+(CO)2) and gaseous CO peaks. The Cu+ cations located at the phase interface are the main active sites. The Cu and Ce in-teractions lead to the formation of solid solutions of CuCe0.75Zr0.25O8 (CuCeZr). The monocarbonyls [Cu+-CO1 are the dominant species during CO oxidation, and the vacancies in the solid solutions are occupied by oxygen, accelerating the oxygen cycle. The TiO2 or ZSM-5 supports promote copper dispersion over CuCe0.75Zr0.25O8/ TiO2 (CuCeZr/T) and CuCe0.75Zr0.25O8/ZSM-5 (CuCeZr/Z) catalysts, which can be attributed to their high surface areas (168.2 and 346.3 m2/g, respectively), while the Cu-Ce interactions are less relevant. Hence, CO oxidation mainly occurs at the phase interface between copper oxide and TiO2/ZSM-5. Dicarbonyls [Cu+(CO)21 are the main intermediates for the CuCeZr/T and CuCeZr/Z catalysts, and the Cu2+ species are reduced to form dicar-bonyls that also take part in the oxidation process. Although a well copper dispersion enhances the activity of individual copper sites on the CuCeZr/T and CuCeZr/Z catalysts, considering the redshift of the carbonyl bands and the increase in CO adsorption, the close interactions and high contents of Cu and Ce favor the local accu-mulation of heat and mass transfer over bulk CuCeZr, leading to the ignition of CO at low temperatures.
关键词	Carbon monoxide Self-sustained catalytic combustion Support effect Copper-cerium-zirconium mixed oxide Magnetically driven IR cell
DOI	10.1016/j.apcatb.2023.122435
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001005369900001
WOS研究方向	Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
项目资助者	National Natural Science Foundation of China [52176141] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21040500] ; China Scholarship Council [202004910623]
论文分区	一类
力学所作者排名	1
RpAuthor	Chen, GX (corresponding author), Fraunhofer Res Inst Mat Recycling & Resource Strat, Brentanostr 2a, D-63755 Alzenau, Germany. ; Tu, X (corresponding author), Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, England. ; Bin, F (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/92413
专题	高温气体动力学国家重点实验室
作者单位	1.{Kang Running, Zhang Zirui, Bin Feng, Wei Xiaolin} Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China 2.{Kang Running, Bin Feng, Wei Xiaolin} Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China 3.{Li Yongdan} Aalto Univ Sch Chem Engn Dept Chem & Met Engn Kemistintie 1POB 16100 FI-00076 Espoo Finland 4.{Chen Guoxing} Fraunhofer Res Inst Mat Recycling & Resource Strat Brentanostr 2a D-63755 Alzenau Germany 5.{Tu Xin} Univ Liverpool Dept Elect Engn & Elect Liverpool L69 3GJ England 6.{Bin Feng} Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China
推荐引用方式 GB/T 7714	Kang RN,Zhang ZR,Bin F,et al. Catalytic ignition of CO over CuCeZr based catalysts: New insights into the support effects and reaction pathways[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2023,327:122435.
APA	康润宁.,张梓睿.,宾峰.,魏小林.,Li, Yongdan.,...&Tu, Xin.(2023).Catalytic ignition of CO over CuCeZr based catalysts: New insights into the support effects and reaction pathways.APPLIED CATALYSIS B-ENVIRONMENTAL,327,122435.
MLA	康润宁,et al."Catalytic ignition of CO over CuCeZr based catalysts: New insights into the support effects and reaction pathways".APPLIED CATALYSIS B-ENVIRONMENTAL 327(2023):122435.

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