Stabilization of tin in bimetallic iridium-tin systems supported on alumina and silica. Mössbauer Spectroscopy and Catalytic Activity

K. Lázár, P. Bussière, M. Guénin, R. Fréty

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In situ Mössbauer spectroscopic studies were performed on the formation process of different tin species and their stabilization during 373-673 K hydrogen activation of supported 10 wt.% iridium-tin samples which had a 1:1 iridium to tin ratio. All three oxidation states of tin (Sn4+, Sn2+ and Sn0) were stabilized on alumina while mainly iridium-tin alloy formation was detected on silica. Iridium promoted the total Sn4+ → Sn0 reduction on both supports and zero valent tin once formed remained in close contact with iridium. After stabilization neither a medium-temperature model reaction nor further hydrogen treatments had any influence on the concentrations of the different ionic and metallic components. Consequently, catalytic activity and electron microscopy measurements carried out on the stabilized samples revealed the presence of unblocked iridium on alumina support while no free iridium exhibiting catalytic activity was detected on silica.

Original languageEnglish
Pages (from-to)19-40
Number of pages22
JournalApplied Catalysis
Volume38
Issue number1
DOIs
Publication statusPublished - 1988

Fingerprint

Iridium
Tin
Catalyst activity
Alumina
Stabilization
Silica
Spectroscopy
Iridium alloys
Tin alloys
Hydrogen
Catalyst supports
Electron microscopy
Chemical activation
Oxidation

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Stabilization of tin in bimetallic iridium-tin systems supported on alumina and silica. Mössbauer Spectroscopy and Catalytic Activity. / Lázár, K.; Bussière, P.; Guénin, M.; Fréty, R.

In: Applied Catalysis, Vol. 38, No. 1, 1988, p. 19-40.

Research output: Contribution to journalArticle

@article{a46946ea5e534747b1be02f823bf5054,
title = "Stabilization of tin in bimetallic iridium-tin systems supported on alumina and silica. M{\"o}ssbauer Spectroscopy and Catalytic Activity",
abstract = "In situ M{\"o}ssbauer spectroscopic studies were performed on the formation process of different tin species and their stabilization during 373-673 K hydrogen activation of supported 10 wt.{\%} iridium-tin samples which had a 1:1 iridium to tin ratio. All three oxidation states of tin (Sn4+, Sn2+ and Sn0) were stabilized on alumina while mainly iridium-tin alloy formation was detected on silica. Iridium promoted the total Sn4+ → Sn0 reduction on both supports and zero valent tin once formed remained in close contact with iridium. After stabilization neither a medium-temperature model reaction nor further hydrogen treatments had any influence on the concentrations of the different ionic and metallic components. Consequently, catalytic activity and electron microscopy measurements carried out on the stabilized samples revealed the presence of unblocked iridium on alumina support while no free iridium exhibiting catalytic activity was detected on silica.",
author = "K. L{\'a}z{\'a}r and P. Bussi{\`e}re and M. Gu{\'e}nin and R. Fr{\'e}ty",
year = "1988",
doi = "10.1016/S0166-9834(00)80983-5",
language = "English",
volume = "38",
pages = "19--40",
journal = "Applied Catalysis",
issn = "0166-9834",
publisher = "Elsevier BV",
number = "1",

}

TY - JOUR

T1 - Stabilization of tin in bimetallic iridium-tin systems supported on alumina and silica. Mössbauer Spectroscopy and Catalytic Activity

AU - Lázár, K.

AU - Bussière, P.

AU - Guénin, M.

AU - Fréty, R.

PY - 1988

Y1 - 1988

N2 - In situ Mössbauer spectroscopic studies were performed on the formation process of different tin species and their stabilization during 373-673 K hydrogen activation of supported 10 wt.% iridium-tin samples which had a 1:1 iridium to tin ratio. All three oxidation states of tin (Sn4+, Sn2+ and Sn0) were stabilized on alumina while mainly iridium-tin alloy formation was detected on silica. Iridium promoted the total Sn4+ → Sn0 reduction on both supports and zero valent tin once formed remained in close contact with iridium. After stabilization neither a medium-temperature model reaction nor further hydrogen treatments had any influence on the concentrations of the different ionic and metallic components. Consequently, catalytic activity and electron microscopy measurements carried out on the stabilized samples revealed the presence of unblocked iridium on alumina support while no free iridium exhibiting catalytic activity was detected on silica.

AB - In situ Mössbauer spectroscopic studies were performed on the formation process of different tin species and their stabilization during 373-673 K hydrogen activation of supported 10 wt.% iridium-tin samples which had a 1:1 iridium to tin ratio. All three oxidation states of tin (Sn4+, Sn2+ and Sn0) were stabilized on alumina while mainly iridium-tin alloy formation was detected on silica. Iridium promoted the total Sn4+ → Sn0 reduction on both supports and zero valent tin once formed remained in close contact with iridium. After stabilization neither a medium-temperature model reaction nor further hydrogen treatments had any influence on the concentrations of the different ionic and metallic components. Consequently, catalytic activity and electron microscopy measurements carried out on the stabilized samples revealed the presence of unblocked iridium on alumina support while no free iridium exhibiting catalytic activity was detected on silica.

UR - http://www.scopus.com/inward/record.url?scp=0023981383&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0023981383&partnerID=8YFLogxK

U2 - 10.1016/S0166-9834(00)80983-5

DO - 10.1016/S0166-9834(00)80983-5

M3 - Article

AN - SCOPUS:0023981383

VL - 38

SP - 19

EP - 40

JO - Applied Catalysis

JF - Applied Catalysis

SN - 0166-9834

IS - 1

ER -