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Highly Selective PdCu/Amorphous Silica-Alumina (ASA) Catalysts for Groundwater Denitration
Alternative TitleEnviron. Sci. Technol.
Xie, Yongbing1,2,3; Cao, Hongbin1,2,3; Li, Yuping1,2,3; Zhang, Yi1,2,3; Crittenden, John C.4
2011-05-01
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume45Issue:9Pages:4066-4072
AbstractCatalytic nitrate reduction is a promising technology in groundwater purification. In this study, PdCu bimetallic catalysts supported on an industrial amorphous silica-alumina (ASA) were synthesized and used to simulate catalytic removal of nitrate in groundwater. The catalysts exhibited very high activity and the highest catalytic selectivity toward N(2)O and N(2) was 90.2%. The optimal Pd/Cu weight ratio was four. Relatively low reduction temperature was found benefit the catalytic stability and 300 degrees C was the appropriate reduction temperature during catalyst preparation. With an average particle size 5.4 nm, the metal particles were very uniformly distributed on the catalyst surface prepared with the codeposition method. This kept the catalyst more stable than the PdCu/Al(2)O(3) catalyst with larger metal particles. According to XRD, TEM, and XPS results, the metals maintained zero-valence but aggregated by about 2 nm during the denitration reaction, which caused gradual deactivation of the catalysts. Little leaching of Cu and Pd from the catalyst might also have a slightly negative impact to the stability of the catalysts. A simple treatment was found to redistribute the particles on the deactivated catalysts, and high catalytic activity was recovered after this process.; Catalytic nitrate reduction is a promising technology in groundwater purification. In this study, PdCu bimetallic catalysts supported on an industrial amorphous silica-alumina (ASA) were synthesized and used to simulate catalytic removal of nitrate in groundwater. The catalysts exhibited very high activity and the highest catalytic selectivity toward N(2)O and N(2) was 90.2%. The optimal Pd/Cu weight ratio was four. Relatively low reduction temperature was found benefit the catalytic stability and 300 degrees C was the appropriate reduction temperature during catalyst preparation. With an average particle size 5.4 nm, the metal particles were very uniformly distributed on the catalyst surface prepared with the codeposition method. This kept the catalyst more stable than the PdCu/Al(2)O(3) catalyst with larger metal particles. According to XRD, TEM, and XPS results, the metals maintained zero-valence but aggregated by about 2 nm during the denitration reaction, which caused gradual deactivation of the catalysts. Little leaching of Cu and Pd from the catalyst might also have a slightly negative impact to the stability of the catalysts. A simple treatment was found to redistribute the particles on the deactivated catalysts, and high catalytic activity was recovered after this process.
KeywordNitrate Reduction Pd-cu Drinking-water Hydrogenation Removal Carbon Tio2 Acid
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Life Sciences & Biomedicine
DOI10.1021/es104050h
URL查看原文
Indexed BySCI
Language英语
WOS KeywordNITRATE REDUCTION ; PD-CU ; DRINKING-WATER ; HYDROGENATION ; REMOVAL ; CARBON ; TIO2 ; ACID
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000289819400040
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6364
Collection研究所(批量导入)
Affiliation1.Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Res Ctr Proc Pollut Control, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
4.Georgia Inst Technol, Brook Byers Inst Sustainable Syst, Atlanta, GA 30332 USA
Recommended Citation
GB/T 7714
Xie, Yongbing,Cao, Hongbin,Li, Yuping,et al. Highly Selective PdCu/Amorphous Silica-Alumina (ASA) Catalysts for Groundwater Denitration[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2011,45(9):4066-4072.
APA Xie, Yongbing,Cao, Hongbin,Li, Yuping,Zhang, Yi,&Crittenden, John C..(2011).Highly Selective PdCu/Amorphous Silica-Alumina (ASA) Catalysts for Groundwater Denitration.ENVIRONMENTAL SCIENCE & TECHNOLOGY,45(9),4066-4072.
MLA Xie, Yongbing,et al."Highly Selective PdCu/Amorphous Silica-Alumina (ASA) Catalysts for Groundwater Denitration".ENVIRONMENTAL SCIENCE & TECHNOLOGY 45.9(2011):4066-4072.
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