Study of Au/SnO x -Al2O3 catalysts used in CO oxidation by in situ Mössbauer spectroscopy

Ferenc Somodi, I. Borbáth, József L. Margitfalvi, Sándor Stichleutner, K. Lázár

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The active catalytic components in tin oxide containing alumina-supported gold catalyst were examined by comparing and analysing the in situ Mössbauer spectra of the SnO x -Al2O3 support and the 3 wt.% Au/SnO x -Al2O3 catalyst (1.1 wt.% Sn, Au/Sn = 3:2 atomic ratio). Samples were prepared by using organometallic precursor of 119SnMe4 (enriched). First tin was grafted to the alumina surface from the organometallic precursor compound. In the next step the grafted complexes were decomposed in flowing oxygen. Gold was deposited onto the SnO x -Al2O3 support in the subsequent step. Analysis of in situ spectra shows that in Au/SnO x -Al2O3 catalyst after activation in hydrogen at 620 K tin may occur in three different oxidation states [Sn (IV), Sn(II) and Sn(0)] simultaneously. The metallic tin is a component of the bimetallic AuSn alloy phase. Data presented provide the first evidence for the formation of alloy-type supported Sn-Au catalyst on alumina. Furthermore, from the spectra recorded at different temperatures, values of the Debye temperatures and recoilless fractions were also determined for the various species. The results show that in catalytic oxidation of carbon monoxide at room temperature the dominant part of Sn(II) and the AuSn alloy is oxidized.

Original languageEnglish
Pages (from-to)13-21
Number of pages9
JournalHyperfine Interactions
Volume192
Issue number1-3
DOIs
Publication statusPublished - Jul 2009

Fingerprint

Carbon Monoxide
Tin
Aluminum Oxide
Spectroscopy
catalysts
tin
Oxidation
oxidation
Catalysts
aluminum oxides
Organometallics
Gold
spectroscopy
gold
Debye temperature
organometallic compounds
Catalytic oxidation
carbon monoxide
tin oxides
Hydrogen

Keywords

  • Sn Mössbauer spectroscopy
  • Alumina-supported gold catalyst
  • AuSn alloy
  • Carbon monoxide oxidation
  • Tin oxide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Study of Au/SnO x -Al2O3 catalysts used in CO oxidation by in situ Mössbauer spectroscopy. / Somodi, Ferenc; Borbáth, I.; Margitfalvi, József L.; Stichleutner, Sándor; Lázár, K.

In: Hyperfine Interactions, Vol. 192, No. 1-3, 07.2009, p. 13-21.

Research output: Contribution to journalArticle

Somodi, Ferenc ; Borbáth, I. ; Margitfalvi, József L. ; Stichleutner, Sándor ; Lázár, K. / Study of Au/SnO x -Al2O3 catalysts used in CO oxidation by in situ Mössbauer spectroscopy. In: Hyperfine Interactions. 2009 ; Vol. 192, No. 1-3. pp. 13-21.
@article{5235df1297784a2a977953c023d41125,
title = "Study of Au/SnO x -Al2O3 catalysts used in CO oxidation by in situ M{\"o}ssbauer spectroscopy",
abstract = "The active catalytic components in tin oxide containing alumina-supported gold catalyst were examined by comparing and analysing the in situ M{\"o}ssbauer spectra of the SnO x -Al2O3 support and the 3 wt.{\%} Au/SnO x -Al2O3 catalyst (1.1 wt.{\%} Sn, Au/Sn = 3:2 atomic ratio). Samples were prepared by using organometallic precursor of 119SnMe4 (enriched). First tin was grafted to the alumina surface from the organometallic precursor compound. In the next step the grafted complexes were decomposed in flowing oxygen. Gold was deposited onto the SnO x -Al2O3 support in the subsequent step. Analysis of in situ spectra shows that in Au/SnO x -Al2O3 catalyst after activation in hydrogen at 620 K tin may occur in three different oxidation states [Sn (IV), Sn(II) and Sn(0)] simultaneously. The metallic tin is a component of the bimetallic AuSn alloy phase. Data presented provide the first evidence for the formation of alloy-type supported Sn-Au catalyst on alumina. Furthermore, from the spectra recorded at different temperatures, values of the Debye temperatures and recoilless fractions were also determined for the various species. The results show that in catalytic oxidation of carbon monoxide at room temperature the dominant part of Sn(II) and the AuSn alloy is oxidized.",
keywords = "Sn M{\"o}ssbauer spectroscopy, Alumina-supported gold catalyst, AuSn alloy, Carbon monoxide oxidation, Tin oxide",
author = "Ferenc Somodi and I. Borb{\'a}th and Margitfalvi, {J{\'o}zsef L.} and S{\'a}ndor Stichleutner and K. L{\'a}z{\'a}r",
year = "2009",
month = "7",
doi = "10.1007/s10751-009-9941-8",
language = "English",
volume = "192",
pages = "13--21",
journal = "Hyperfine Interaction",
issn = "0304-3843",
publisher = "Springer Netherlands",
number = "1-3",

}

TY - JOUR

T1 - Study of Au/SnO x -Al2O3 catalysts used in CO oxidation by in situ Mössbauer spectroscopy

AU - Somodi, Ferenc

AU - Borbáth, I.

AU - Margitfalvi, József L.

AU - Stichleutner, Sándor

AU - Lázár, K.

PY - 2009/7

Y1 - 2009/7

N2 - The active catalytic components in tin oxide containing alumina-supported gold catalyst were examined by comparing and analysing the in situ Mössbauer spectra of the SnO x -Al2O3 support and the 3 wt.% Au/SnO x -Al2O3 catalyst (1.1 wt.% Sn, Au/Sn = 3:2 atomic ratio). Samples were prepared by using organometallic precursor of 119SnMe4 (enriched). First tin was grafted to the alumina surface from the organometallic precursor compound. In the next step the grafted complexes were decomposed in flowing oxygen. Gold was deposited onto the SnO x -Al2O3 support in the subsequent step. Analysis of in situ spectra shows that in Au/SnO x -Al2O3 catalyst after activation in hydrogen at 620 K tin may occur in three different oxidation states [Sn (IV), Sn(II) and Sn(0)] simultaneously. The metallic tin is a component of the bimetallic AuSn alloy phase. Data presented provide the first evidence for the formation of alloy-type supported Sn-Au catalyst on alumina. Furthermore, from the spectra recorded at different temperatures, values of the Debye temperatures and recoilless fractions were also determined for the various species. The results show that in catalytic oxidation of carbon monoxide at room temperature the dominant part of Sn(II) and the AuSn alloy is oxidized.

AB - The active catalytic components in tin oxide containing alumina-supported gold catalyst were examined by comparing and analysing the in situ Mössbauer spectra of the SnO x -Al2O3 support and the 3 wt.% Au/SnO x -Al2O3 catalyst (1.1 wt.% Sn, Au/Sn = 3:2 atomic ratio). Samples were prepared by using organometallic precursor of 119SnMe4 (enriched). First tin was grafted to the alumina surface from the organometallic precursor compound. In the next step the grafted complexes were decomposed in flowing oxygen. Gold was deposited onto the SnO x -Al2O3 support in the subsequent step. Analysis of in situ spectra shows that in Au/SnO x -Al2O3 catalyst after activation in hydrogen at 620 K tin may occur in three different oxidation states [Sn (IV), Sn(II) and Sn(0)] simultaneously. The metallic tin is a component of the bimetallic AuSn alloy phase. Data presented provide the first evidence for the formation of alloy-type supported Sn-Au catalyst on alumina. Furthermore, from the spectra recorded at different temperatures, values of the Debye temperatures and recoilless fractions were also determined for the various species. The results show that in catalytic oxidation of carbon monoxide at room temperature the dominant part of Sn(II) and the AuSn alloy is oxidized.

KW - Sn Mössbauer spectroscopy

KW - Alumina-supported gold catalyst

KW - AuSn alloy

KW - Carbon monoxide oxidation

KW - Tin oxide

UR - http://www.scopus.com/inward/record.url?scp=67349284946&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67349284946&partnerID=8YFLogxK

U2 - 10.1007/s10751-009-9941-8

DO - 10.1007/s10751-009-9941-8

M3 - Article

AN - SCOPUS:67349284946

VL - 192

SP - 13

EP - 21

JO - Hyperfine Interaction

JF - Hyperfine Interaction

SN - 0304-3843

IS - 1-3

ER -