Sn surface-enriched Pt-Sn bimetallic nanoparticles as a selective and stable catalyst for propane dehydrogenation

Handle URI:
http://hdl.handle.net/10754/563896
Title:
Sn surface-enriched Pt-Sn bimetallic nanoparticles as a selective and stable catalyst for propane dehydrogenation
Authors:
Zhu, Haibo; Anjum, Dalaver H.; Wang, Qingxiao; Abou-Hamad, Edy; Emsley, Lyndon; Dong, Hailin; Laveille, Paco; Li, Lidong; Samal, Akshaya Kumar ( 0000-0002-7623-3711 ) ; Basset, Jean-Marie ( 0000-0003-3166-8882 )
Abstract:
A new one pot, surfactant-free, synthetic route based on the surface organometallic chemistry (SOMC) concept has been developed for the synthesis of Sn surface-enriched Pt-Sn nanoparticles. Bu3SnH selectively reacts with [Pt]-H formed in situ at the surface of Pt nanoparticles, Pt NPs, obtained by reduction of K2PtCl4 by LiB(C2H5)3H. Chemical analysis, 1H MAS and 13C CP/MAS solid-state NMR as well as two-dimensional double-quantum (DQ) and triple-quantum (TQ) experiments show that organo-tin moieties Sn(n-C4H9) are chemically linked to the surface of Pt NPs to produce, in fine, after removal of most of the n-butyl fragment, bimetallic Pt-Sn nanoparticles. The Sn(n-CH2CH2CH2CH3) groups remaining at the surface are believed to stabilize the as-synthesized Pt-Sn NPs, enabling the bimetallic NPs to be well dispersed in THF. Additionally, the Pt-Sn nanoparticles can be supported on MgAl2O4 during the synthesis of the nanoparticles. Some of the Pt-Sn/MgAl2O4 catalyst thus prepared exhibits high activity in PROX of CO and an extremely high selectivity and stability in propane dehydrogenation to propylene. The enhanced activity in propane dehydrogenation is associated with the high concentration of inactive Sn at the surface of Pt nanoparticles which ”isolates” the active Pt atoms. This conclusion is confirmed by XRD, NMR, TEM, and XPS analysis.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Core Labs
Publisher:
Elsevier BV
Journal:
Journal of Catalysis
Issue Date:
Dec-2014
DOI:
10.1016/j.jcat.2014.09.013
Type:
Article
ISSN:
00219517
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorZhu, Haiboen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorWang, Qingxiaoen
dc.contributor.authorAbou-Hamad, Edyen
dc.contributor.authorEmsley, Lyndonen
dc.contributor.authorDong, Hailinen
dc.contributor.authorLaveille, Pacoen
dc.contributor.authorLi, Lidongen
dc.contributor.authorSamal, Akshaya Kumaren
dc.contributor.authorBasset, Jean-Marieen
dc.date.accessioned2015-08-03T12:18:45Zen
dc.date.available2015-08-03T12:18:45Zen
dc.date.issued2014-12en
dc.identifier.issn00219517en
dc.identifier.doi10.1016/j.jcat.2014.09.013en
dc.identifier.urihttp://hdl.handle.net/10754/563896en
dc.description.abstractA new one pot, surfactant-free, synthetic route based on the surface organometallic chemistry (SOMC) concept has been developed for the synthesis of Sn surface-enriched Pt-Sn nanoparticles. Bu3SnH selectively reacts with [Pt]-H formed in situ at the surface of Pt nanoparticles, Pt NPs, obtained by reduction of K2PtCl4 by LiB(C2H5)3H. Chemical analysis, 1H MAS and 13C CP/MAS solid-state NMR as well as two-dimensional double-quantum (DQ) and triple-quantum (TQ) experiments show that organo-tin moieties Sn(n-C4H9) are chemically linked to the surface of Pt NPs to produce, in fine, after removal of most of the n-butyl fragment, bimetallic Pt-Sn nanoparticles. The Sn(n-CH2CH2CH2CH3) groups remaining at the surface are believed to stabilize the as-synthesized Pt-Sn NPs, enabling the bimetallic NPs to be well dispersed in THF. Additionally, the Pt-Sn nanoparticles can be supported on MgAl2O4 during the synthesis of the nanoparticles. Some of the Pt-Sn/MgAl2O4 catalyst thus prepared exhibits high activity in PROX of CO and an extremely high selectivity and stability in propane dehydrogenation to propylene. The enhanced activity in propane dehydrogenation is associated with the high concentration of inactive Sn at the surface of Pt nanoparticles which ”isolates” the active Pt atoms. This conclusion is confirmed by XRD, NMR, TEM, and XPS analysis.en
dc.publisherElsevier BVen
dc.subjectCO preferential oxidation (PROX)en
dc.subjectPropane dehydrogenationen
dc.subjectPt-Sn bimetallic nanoparticleen
dc.subjectSurface organometallic chemistryen
dc.titleSn surface-enriched Pt-Sn bimetallic nanoparticles as a selective and stable catalyst for propane dehydrogenationen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentCore Labsen
dc.identifier.journalJournal of Catalysisen
dc.contributor.institutionUniversité de Lyon, Institut de Sciences Analytiques (CNRS/ENS-Lyon/UCB Lyon 1), Centre de RMN à Tre`s Hauts Champs, 5 rue de la Doua69100 Villeurbanne, Franceen
kaust.authorZhu, Haiboen
kaust.authorAnjum, Dalaver H.en
kaust.authorWang, Qingxiaoen
kaust.authorAbou-Hamad, Edyen
kaust.authorDong, Hailinen
kaust.authorLaveille, Pacoen
kaust.authorLi, Lidongen
kaust.authorSamal, Akshaya Kumaren
kaust.authorBasset, Jean-Marieen
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