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Article: Incorporating platinum precursors into a NaA-zeolite synthesis mixture promoting the formation of nanosized zeolite

TitleIncorporating platinum precursors into a NaA-zeolite synthesis mixture promoting the formation of nanosized zeolite
Authors
KeywordsNanocrystalline
Platinum Incorporation
Zeolite A Synthesis
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/micromeso
Citation
Microporous And Mesoporous Materials, 2009, v. 117 n. 1-2, p. 33-40 How to Cite?
AbstractSodium A-zeolite with different platinum contents were prepared by directly incorporating platinum precursor (Pt(NH 3) 4Cl 2) into the zeolite during synthesis. Pt/KA-zeolite was then obtained by ion-exchange with KCl solution. The effect of platinum concentration on the crystal morphology and platinum dispersion was investigated by hydrogen chemisorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), and time-of-flight secondary ion mass spectrometer (TOF-SIMS). SEM results revealed a bimodal crystal size distribution for NaA-zeolite with low platinum concentration (<1 wt%). Chamfered edges were found for all the larger cubic crystals (∼4 μm). Two types of cubic crystals, smooth surface cubes with chamfered edges and rough surface cubes, were observed for the smaller crystals (∼400 nm). The proportion of the rough surface nanosized cubes increased as the platinum content increased. At about 4 wt% platinum, only nanosized rough surface cubic crystals were obtained, which were transformed into nanocrystals of KF-zeolite after ion-exchange with KCl, as indicated by X-ray diffraction results. TOF-SIMS data taken before and after sputtering the surface layers revealed that platinum was distributed homogeneously inside of the zeolite, which was supported by hydrogen chemisorption results, indicating that platinum particles were confined in the zeolitic cages for both the microsized and nanosized cubic crystals. A mechanism was proposed to elucidate the role of platinum precursor on the nucleation and growth of nanosized zeolite, which is consistent with all of the characterization results. Crown Copyright © 2008.
Persistent Identifierhttp://hdl.handle.net/10722/157534
ISSN
2015 Impact Factor: 3.349
2015 SCImago Journal Rankings: 1.243
ISI Accession Number ID
Funding AgencyGrant Number
Canadian Program for Energy Research and Development (PERD)
Alberta Research Council
The Alberta Energy Research Institute
Funding Information:

Partial funding for this work has been provided by the Canadian Program for Energy Research and Development (PERD), the Alberta Research Council and The Alberta Energy Research Institute. The authors gratefully acknowledge Drs. Dimitre Karapuzov and Anqiang He of ACSES for the TOF-SIMS analysis. The editorial assistance of Norman Sacuta is greatly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorYang, Hen_US
dc.contributor.authorChen, Hen_US
dc.contributor.authorDu, Hen_US
dc.contributor.authorHawkins, Ren_US
dc.contributor.authorCraig, Fen_US
dc.contributor.authorRing, Zen_US
dc.contributor.authorOmotoso, Oen_US
dc.contributor.authorMunoz, Ven_US
dc.contributor.authorMikula, Ren_US
dc.date.accessioned2012-08-08T08:51:02Z-
dc.date.available2012-08-08T08:51:02Z-
dc.date.issued2009en_US
dc.identifier.citationMicroporous And Mesoporous Materials, 2009, v. 117 n. 1-2, p. 33-40en_US
dc.identifier.issn1387-1811en_US
dc.identifier.urihttp://hdl.handle.net/10722/157534-
dc.description.abstractSodium A-zeolite with different platinum contents were prepared by directly incorporating platinum precursor (Pt(NH 3) 4Cl 2) into the zeolite during synthesis. Pt/KA-zeolite was then obtained by ion-exchange with KCl solution. The effect of platinum concentration on the crystal morphology and platinum dispersion was investigated by hydrogen chemisorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), and time-of-flight secondary ion mass spectrometer (TOF-SIMS). SEM results revealed a bimodal crystal size distribution for NaA-zeolite with low platinum concentration (<1 wt%). Chamfered edges were found for all the larger cubic crystals (∼4 μm). Two types of cubic crystals, smooth surface cubes with chamfered edges and rough surface cubes, were observed for the smaller crystals (∼400 nm). The proportion of the rough surface nanosized cubes increased as the platinum content increased. At about 4 wt% platinum, only nanosized rough surface cubic crystals were obtained, which were transformed into nanocrystals of KF-zeolite after ion-exchange with KCl, as indicated by X-ray diffraction results. TOF-SIMS data taken before and after sputtering the surface layers revealed that platinum was distributed homogeneously inside of the zeolite, which was supported by hydrogen chemisorption results, indicating that platinum particles were confined in the zeolitic cages for both the microsized and nanosized cubic crystals. A mechanism was proposed to elucidate the role of platinum precursor on the nucleation and growth of nanosized zeolite, which is consistent with all of the characterization results. Crown Copyright © 2008.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/micromesoen_US
dc.relation.ispartofMicroporous and Mesoporous Materialsen_US
dc.subjectNanocrystallineen_US
dc.subjectPlatinum Incorporationen_US
dc.subjectZeolite A Synthesisen_US
dc.titleIncorporating platinum precursors into a NaA-zeolite synthesis mixture promoting the formation of nanosized zeoliteen_US
dc.typeArticleen_US
dc.identifier.emailChen, H:hlchen@hkucc.hku.hken_US
dc.identifier.authorityChen, H=rp00383en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.micromeso.2008.06.009en_US
dc.identifier.scopuseid_2-s2.0-56049098760en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-56049098760&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume117en_US
dc.identifier.issue1-2en_US
dc.identifier.spage33en_US
dc.identifier.epage40en_US
dc.identifier.isiWOS:000262879700004-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridYang, H=7406559680en_US
dc.identifier.scopusauthoridChen, H=26643315400en_US
dc.identifier.scopusauthoridDu, H=55168414100en_US
dc.identifier.scopusauthoridHawkins, R=7402932563en_US
dc.identifier.scopusauthoridCraig, F=24466405100en_US
dc.identifier.scopusauthoridRing, Z=7004109957en_US
dc.identifier.scopusauthoridOmotoso, O=6601909335en_US
dc.identifier.scopusauthoridMunoz, V=35616506200en_US
dc.identifier.scopusauthoridMikula, R=7004695089en_US

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