Sol derived gold-palladium bimetallic nanoparticles on TiO2: Structure and catalytic activity in CO oxidation

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Abstract

Bimetallic AuPd catalysts were prepared by deposition of bimetallic aqueous sols formed in different ways: (i) co-reduction of the precursor Au and Pd ions by Na-citrate/tannic acid mixture, (ii) reduction of Au(III) ions onto preformed Pd sol, and (iii) reduction of Pd(II) ions onto a preformed Au sol. The Au/TiO2 and Pd/TiO2 samples as references were prepared from their respective sols. The structure of the samples was characterized by XRF, XRD, XPS, TEM and CO chemisorption both in the asprepared state and after calcination and reduction. The catalytic activities of the calcined/reduced catalysts in the CO oxidation were compared. The presence of bimetallic crystalline phases was evidenced in all three samples both in the as prepared and calcined/reduced states, however, various extents of Pd surface enrichment were determined. The catalytic activity of the bimetallic samples regardless of the preparation method, is about the same as that of the mixture of the monometallic samples. No significant synergism is suggested in the present bimetallic samples.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalTopics in Catalysis
Volume44
Issue number1-2
DOIs
Publication statusPublished - Jun 2007

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Palladium
Polymethyl Methacrylate
Carbon Monoxide
Sols
Gold
catalytic activity
palladium
Catalyst activity
gold
Nanoparticles
Oxidation
nanoparticles
oxidation
Ions
Catalysts
Tannins
Chemisorption
Citric Acid
Calcination
catalysts

Keywords

  • Au, Pd sol
  • Bimetallic
  • CO oxidation
  • TEM
  • TiO
  • XPS
  • XRD

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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title = "Sol derived gold-palladium bimetallic nanoparticles on TiO2: Structure and catalytic activity in CO oxidation",
abstract = "Bimetallic AuPd catalysts were prepared by deposition of bimetallic aqueous sols formed in different ways: (i) co-reduction of the precursor Au and Pd ions by Na-citrate/tannic acid mixture, (ii) reduction of Au(III) ions onto preformed Pd sol, and (iii) reduction of Pd(II) ions onto a preformed Au sol. The Au/TiO2 and Pd/TiO2 samples as references were prepared from their respective sols. The structure of the samples was characterized by XRF, XRD, XPS, TEM and CO chemisorption both in the asprepared state and after calcination and reduction. The catalytic activities of the calcined/reduced catalysts in the CO oxidation were compared. The presence of bimetallic crystalline phases was evidenced in all three samples both in the as prepared and calcined/reduced states, however, various extents of Pd surface enrichment were determined. The catalytic activity of the bimetallic samples regardless of the preparation method, is about the same as that of the mixture of the monometallic samples. No significant synergism is suggested in the present bimetallic samples.",
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author = "A. Beck and A. Horv{\'a}th and Z. Schay and G. Stefler and Z. Kopp{\'a}ny and I. Saj{\'o} and O. Geszti and L. Guczi",
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T1 - Sol derived gold-palladium bimetallic nanoparticles on TiO2

T2 - Structure and catalytic activity in CO oxidation

AU - Beck, A.

AU - Horváth, A.

AU - Schay, Z.

AU - Stefler, G.

AU - Koppány, Z.

AU - Sajó, I.

AU - Geszti, O.

AU - Guczi, L.

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N2 - Bimetallic AuPd catalysts were prepared by deposition of bimetallic aqueous sols formed in different ways: (i) co-reduction of the precursor Au and Pd ions by Na-citrate/tannic acid mixture, (ii) reduction of Au(III) ions onto preformed Pd sol, and (iii) reduction of Pd(II) ions onto a preformed Au sol. The Au/TiO2 and Pd/TiO2 samples as references were prepared from their respective sols. The structure of the samples was characterized by XRF, XRD, XPS, TEM and CO chemisorption both in the asprepared state and after calcination and reduction. The catalytic activities of the calcined/reduced catalysts in the CO oxidation were compared. The presence of bimetallic crystalline phases was evidenced in all three samples both in the as prepared and calcined/reduced states, however, various extents of Pd surface enrichment were determined. The catalytic activity of the bimetallic samples regardless of the preparation method, is about the same as that of the mixture of the monometallic samples. No significant synergism is suggested in the present bimetallic samples.

AB - Bimetallic AuPd catalysts were prepared by deposition of bimetallic aqueous sols formed in different ways: (i) co-reduction of the precursor Au and Pd ions by Na-citrate/tannic acid mixture, (ii) reduction of Au(III) ions onto preformed Pd sol, and (iii) reduction of Pd(II) ions onto a preformed Au sol. The Au/TiO2 and Pd/TiO2 samples as references were prepared from their respective sols. The structure of the samples was characterized by XRF, XRD, XPS, TEM and CO chemisorption both in the asprepared state and after calcination and reduction. The catalytic activities of the calcined/reduced catalysts in the CO oxidation were compared. The presence of bimetallic crystalline phases was evidenced in all three samples both in the as prepared and calcined/reduced states, however, various extents of Pd surface enrichment were determined. The catalytic activity of the bimetallic samples regardless of the preparation method, is about the same as that of the mixture of the monometallic samples. No significant synergism is suggested in the present bimetallic samples.

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