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Single-atom Ir(1 )supported on rutile TiO2 for excellent selective catalytic oxidation of ammonia

Wang, Yixi1,4; Xu, Wenqing1,2; Chen, Xueyan3; Li, Chaoqun1; Xie, Jun1; Yang, Yang1; Zhu, Tingyu1,2; Zhang, Changbin3,4
2022-06-15
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume432Pages:12
AbstractGaseous ammonia (NH3) in the atmosphere is potentially harmful to both human health and the environment. The selective catalytic oxidation of NH3 (termed as NH3-SCO) into N-2 and H2O is a promising method for decreasing NH3 emissions. A highly efficient catalyst is required for controlling NH3 emissions by this method in practice. In this study, we prepared Ir/TiO2 catalysts using different crystal structures of TiO2 (rutile, P25 or anatase) as supports by a simple impregnation method and evaluated their performance in the NH3-SCO. We found that the Ir/TiO2-R (rutile) catalyst performed better than the Ir/TiO2-P25 (mixed-phase) and Ir/TiO2-A (anatase) catalyst. High-angle annular dark-field images of the aberration-corrected scanning transmission electron microscopy revealed that the Ir species were mainly atomically dispersed on the TiO2 support in Ir/TiO2-R with 1 wt% Ir loading, whereas the Ir species agglomerated to form clusters or nanoparticles in Ir/TiO2-P25 and Ir/TiO2-A. The combined results of X-ray absorption fine structure, H-2-temperature-programmed reduction, and in situ diffuse reflectance for infrared Fourier Transform spectroscopy studies suggested that atomically dispersed Ir species had stronger electronic metal-support interaction with rutile TiO2, which resulted in easier to adsorb and activate O-2 at the interface and thus, better low-temperature activity of the Ir/TiO2-R catalyst.
KeywordSingle-atom catalyst

NH3-SCO

Ir/TiO2

Crystal structure Supported catalyst
DOI10.1016/j.jhazmat.2022.128670
Language英语
WOS KeywordMIXED-OXIDE CATALYST ; SUPPORT INTERACTIONS ; LATTICE STRAIN ; SLIP AMMONIA ; REDUCTION ; MECHANISM ; NOX ; PERFORMANCE ; NITROGEN ; IRO2
Funding ProjectNational 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 Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
Funding OrganizationNational 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
WOS IDWOS:000782125500004
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/52814
Collection中国科学院过程工程研究所
Corresponding AuthorXu, Wenqing; Zhang, Changbin
Affiliation1.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, Fujian, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yixi,Xu, Wenqing,Chen, Xueyan,et al.

Single-atom Ir(1 )supported on rutile TiO2 for excellent selective catalytic oxidation of ammonia

[J]. JOURNAL OF HAZARDOUS MATERIALS,2022,432:12.
APA Wang, Yixi.,Xu, Wenqing.,Chen, Xueyan.,Li, Chaoqun.,Xie, Jun.,...&Zhang, Changbin.(2022).

Single-atom Ir(1 )supported on rutile TiO2 for excellent selective catalytic oxidation of ammonia

.JOURNAL OF HAZARDOUS MATERIALS,432,12.
MLA Wang, Yixi,et al."

Single-atom Ir(1 )supported on rutile TiO2 for excellent selective catalytic oxidation of ammonia

".JOURNAL OF HAZARDOUS MATERIALS 432(2022):12.
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