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- Publisher Website: 10.1021/es7023115
- Scopus: eid_2-s2.0-42149164892
- PMID: 18497163
- WOS: WOS:000254890400059
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Article: Palladium-indium catalyzed reduction of N-nitrosodimethylamine: Indium as a promoter metal
Title | Palladium-indium catalyzed reduction of N-nitrosodimethylamine: Indium as a promoter metal |
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Authors | |
Issue Date | 2008 |
Publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/est |
Citation | Environmental Science And Technology, 2008, v. 42 n. 8, p. 3040-3046 How to Cite? |
Abstract | An emerging technology for the removal of N-nitrosodimethylamine (NDMA) from drinking and groundwater is reductive destruction using noble metal catalysts and hydrogen gas as a reducing agent. Bimetallic palladium-indium (Pd-In) supported on alumina combines the ability of In to activate NDMA with the hydrogen activating properties of Pd. This study examined the effect of In addition to a commercial 5% Pd by weight on γ-Al 2O 3 catalyst on the efficacy of NDMA reduction. The pseudo-first-order rate constant increased proportionately to In loading from 0.057 h -1 for 0% In to a maximum of 0.25 h -1 for 1% In and then decreased with additional In loading. Data suggest that hydrogen activation occurred only on Pd surfaces and In activated NDMA 20 times more effectively than Pd on a mass basis. The rate-limiting factor was NDMA activation for In loadings below 1%. The decrease at higher loadings is interpreted as In blocking pore spaces and limiting access to Pd sites, suggesting monatomic hydrogen limitation. The only products detected were dimethylamine and ammonium with carbon and nitrogen balances in excess of 92%, consistent with a mechanism involving reductive N-N bond cleavage. Results from this study serve as a basis for optimizing bimetallic catalysts for treating NDMA contaminated waters. © 2008 American Chemical Society. |
Persistent Identifier | http://hdl.handle.net/10722/71120 |
ISSN | 2023 Impact Factor: 10.8 2023 SCImago Journal Rankings: 3.516 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Davie, MG | en_HK |
dc.contributor.author | Shih, K | en_HK |
dc.contributor.author | Pacheco, FA | en_HK |
dc.contributor.author | Leckie, JO | en_HK |
dc.contributor.author | Reinhard, M | en_HK |
dc.date.accessioned | 2010-09-06T06:29:05Z | - |
dc.date.available | 2010-09-06T06:29:05Z | - |
dc.date.issued | 2008 | en_HK |
dc.identifier.citation | Environmental Science And Technology, 2008, v. 42 n. 8, p. 3040-3046 | en_HK |
dc.identifier.issn | 0013-936X | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/71120 | - |
dc.description.abstract | An emerging technology for the removal of N-nitrosodimethylamine (NDMA) from drinking and groundwater is reductive destruction using noble metal catalysts and hydrogen gas as a reducing agent. Bimetallic palladium-indium (Pd-In) supported on alumina combines the ability of In to activate NDMA with the hydrogen activating properties of Pd. This study examined the effect of In addition to a commercial 5% Pd by weight on γ-Al 2O 3 catalyst on the efficacy of NDMA reduction. The pseudo-first-order rate constant increased proportionately to In loading from 0.057 h -1 for 0% In to a maximum of 0.25 h -1 for 1% In and then decreased with additional In loading. Data suggest that hydrogen activation occurred only on Pd surfaces and In activated NDMA 20 times more effectively than Pd on a mass basis. The rate-limiting factor was NDMA activation for In loadings below 1%. The decrease at higher loadings is interpreted as In blocking pore spaces and limiting access to Pd sites, suggesting monatomic hydrogen limitation. The only products detected were dimethylamine and ammonium with carbon and nitrogen balances in excess of 92%, consistent with a mechanism involving reductive N-N bond cleavage. Results from this study serve as a basis for optimizing bimetallic catalysts for treating NDMA contaminated waters. © 2008 American Chemical Society. | en_HK |
dc.language | eng | en_HK |
dc.publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/est | en_HK |
dc.relation.ispartof | Environmental Science and Technology | en_HK |
dc.subject.mesh | Aluminum Oxide - chemistry | - |
dc.subject.mesh | Dimethylnitrosamine - chemistry | - |
dc.subject.mesh | Indium - chemistry | - |
dc.subject.mesh | Palladium - chemistry | - |
dc.subject.mesh | Water Pollutants, Chemical - chemistry | - |
dc.title | Palladium-indium catalyzed reduction of N-nitrosodimethylamine: Indium as a promoter metal | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Shih, K:kshih@hkucc.hku.hk | en_HK |
dc.identifier.authority | Shih, K=rp00167 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1021/es7023115 | en_HK |
dc.identifier.pmid | 18497163 | - |
dc.identifier.scopus | eid_2-s2.0-42149164892 | en_HK |
dc.identifier.hkuros | 148376 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-42149164892&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 42 | en_HK |
dc.identifier.issue | 8 | en_HK |
dc.identifier.spage | 3040 | en_HK |
dc.identifier.epage | 3046 | en_HK |
dc.identifier.isi | WOS:000254890400059 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Davie, MG=15126925800 | en_HK |
dc.identifier.scopusauthorid | Shih, K=14072108900 | en_HK |
dc.identifier.scopusauthorid | Pacheco, FA=55182776200 | en_HK |
dc.identifier.scopusauthorid | Leckie, JO=7006717360 | en_HK |
dc.identifier.scopusauthorid | Reinhard, M=7102724330 | en_HK |
dc.identifier.issnl | 0013-936X | - |