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Effects of IrO2 nanoparticle sizes on Ir/Al2O3 catalysts for the selective catalytic oxidation of ammonia

文献类型：期刊论文

作者Wang, Yixi1,3; Xu, Wenqing1,2; Li, Chaoqun1; Yang, Yang1; Geng, Zanbu1,3; Zhu, Tingyu1,2
刊名CHEMICAL ENGINEERING JOURNAL
出版日期2022-06-01
卷号437页码:8
关键词

NH3 & ndash

Ir/Al2O3

Reducible oxygen route Dehydrogenation SCO
ISSN号1385-8947
DOI10.1016/j.cej.2022.135398
英文摘要Gaseous ammonia (NH3), especially that emitted from selective catalytic reduction with NH3 (NH3-SCR) units in the atmosphere is potentially harmful to both human health and the environment. The noble metal catalytic oxidation technology placed behind the SCR unit has been considered to be a promising method for decreasing NH3 slip. In this study, we prepared Ir/Al2O3 catalysts using two different crystal structures of Al2O3 (alpha-Al2O3 or gamma-Al2O3 ) as supported by an impregnation method and evaluated the performance of the selective catalytic oxidation of NH3 (NH3-SCO). We found that the Ir/gamma-Al2O3 catalyst performed better than the Ir/alpha-Al2O3 catalysts, with 99% of NH3 converted at 260 C. The X-ray absorption fine structure revealed that the active species on the Ir/Al2O3 catalysts are mainly oxidized IrO2. High-angle annular dark-field images of aberration-corrected scanning transmission electron microscopy revealed that IrO2 species over 1 nm in diameter are beneficial for activity. In situ diffuse reflectance for infrared Fourier transform spectroscopy studies suggested that the differences in NH3-SCO activity were caused by the activity of reactive oxygen species, and the formation of -NH(2 )may be the decisive step of the NH3 oxidation reaction.
WOS关键词METAL-SUPPORT INTERACTIONS ; LOW-TEMPERATURE ; FORMALDEHYDE OXIDATION ; SLIP AMMONIA ; NOBLE-METAL ; REDUCTION ; MECHANISM ; NOX ; N-2 ; RH
资助项目National Natural Science Foundation of China[52070180] ; Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences[XDPB1902] ; Key Research and Development Project of Shandong Province[2020CXGC011402]
WOS研究方向Engineering
语种英语
WOS记录号WOS:000782961500001
出版者ELSEVIER SCIENCE SA
资助机构National Natural Science Foundation of China ; Cultivating Project of Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research and Development Project of Shandong Province
源URL[http://ir.ipe.ac.cn/handle/122111/52644]  
专题中国科学院过程工程研究所
通讯作者Xu, Wenqing
作者单位1.Chinese Acad Sci, Innovat Acad Green Mfg, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Yixi,Xu, Wenqing,Li, Chaoqun,et al. Effects of IrO2 nanoparticle sizes on Ir/Al2O3 catalysts for the selective catalytic oxidation of ammonia[J]. CHEMICAL ENGINEERING JOURNAL,2022,437:8.
APA Wang, Yixi,Xu, Wenqing,Li, Chaoqun,Yang, Yang,Geng, Zanbu,&Zhu, Tingyu.(2022).Effects of IrO2 nanoparticle sizes on Ir/Al2O3 catalysts for the selective catalytic oxidation of ammonia.CHEMICAL ENGINEERING JOURNAL,437,8.
MLA Wang, Yixi,et al."Effects of IrO2 nanoparticle sizes on Ir/Al2O3 catalysts for the selective catalytic oxidation of ammonia".CHEMICAL ENGINEERING JOURNAL 437(2022):8.

入库方式： OAI收割

来源：过程工程研究所

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