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Article: Palladium-indium catalyzed reduction of N-nitrosodimethylamine: Indium as a promoter metal

TitlePalladium-indium catalyzed reduction of N-nitrosodimethylamine: Indium as a promoter metal
Authors
Issue Date2008
PublisherAmerican 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?
AbstractAn 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 Identifierhttp://hdl.handle.net/10722/71120
ISSN
2015 Impact Factor: 5.393
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDavie, MGen_HK
dc.contributor.authorShih, Ken_HK
dc.contributor.authorPacheco, FAen_HK
dc.contributor.authorLeckie, JOen_HK
dc.contributor.authorReinhard, Men_HK
dc.date.accessioned2010-09-06T06:29:05Z-
dc.date.available2010-09-06T06:29:05Z-
dc.date.issued2008en_HK
dc.identifier.citationEnvironmental Science And Technology, 2008, v. 42 n. 8, p. 3040-3046en_HK
dc.identifier.issn0013-936Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/71120-
dc.description.abstractAn 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.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/esten_HK
dc.relation.ispartofEnvironmental Science and Technologyen_HK
dc.subject.meshAluminum Oxide - chemistry-
dc.subject.meshDimethylnitrosamine - chemistry-
dc.subject.meshIndium - chemistry-
dc.subject.meshPalladium - chemistry-
dc.subject.meshWater Pollutants, Chemical - chemistry-
dc.titlePalladium-indium catalyzed reduction of N-nitrosodimethylamine: Indium as a promoter metalen_HK
dc.typeArticleen_HK
dc.identifier.emailShih, K:kshih@hkucc.hku.hken_HK
dc.identifier.authorityShih, K=rp00167en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/es7023115en_HK
dc.identifier.pmid18497163-
dc.identifier.scopuseid_2-s2.0-42149164892en_HK
dc.identifier.hkuros148376en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-42149164892&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume42en_HK
dc.identifier.issue8en_HK
dc.identifier.spage3040en_HK
dc.identifier.epage3046en_HK
dc.identifier.isiWOS:000254890400059-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridDavie, MG=15126925800en_HK
dc.identifier.scopusauthoridShih, K=14072108900en_HK
dc.identifier.scopusauthoridPacheco, FA=55182776200en_HK
dc.identifier.scopusauthoridLeckie, JO=7006717360en_HK
dc.identifier.scopusauthoridReinhard, M=7102724330en_HK

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