Total oxidation of VOCs on Pd and/or Au supported on TiO/ZrO followed by "operando" DRIFT

M. Hosseini, S. Siffert, R. Cousin, A. Aboukaïs, Z. Hadj-Sadok, B.-L. Su

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Catalytic performances of nanostructured mesoporous TiO-ZrO mixed oxides impregnated by Pd and/or Au were studied in toluene total oxidation in a fixed bed microreactor and with "operando" DRIFT. Mesoporous TiO-ZrO mixed oxides with various Ti:Zr mole ratio of 80/20, 50/50 and 20/80, high surface areas were synthesised using a mixture of zirconium propoxide and titanium isoporopoxide as Zr and Ti sources and also CTMABr as surfactant. The new supports are impregnated by 0.5 or 1.5 wt% of palladium and 1 wt% of gold using impregnation and Deposition-Precipitation methods. The catalytic activity for the nanostructured mesoporous TiO-ZrO mixed oxides varies depending on the molar ratio of Ti:Zr and also for all series of the studied catalysts impregnated by Pd and/or Au, when the gold is loaded firstly the activity in toluene complete oxidation is higher than when Pd was deposited firstly (PdAu/TZ > 1.5Pd/TZ > AuPd/TZ > Pd/TZ > Au/TZ > TZ). The highest activity of PdAu/TZ (80/20) can be related to the higher acid sites density of the support and also to the presence of a synergetic effect between palladium and gold. "Operando" DRIFT allowed following the VOCs oxidation but also suggesting an interaction between the adsorbed molecule and the catalyst which decreases when the activity for oxidation reaction increases.
langue originaleAnglais
Pages (de - à)654-659
Nombre de pages6
journalComptes Rendus Chimie
Volume12
Numéro de publication6-7
Les DOIs
étatPublié - 1 juin 2009

Empreinte digitale

Volatile organic compounds
Gold
Oxides
Oxidation
Toluene
Palladium
Catalysts
Titanium
Zirconium
Surface-Active Agents
Impregnation
Catalyst activity
Surface active agents
Molecules
Acids

Citer ceci

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abstract = "Catalytic performances of nanostructured mesoporous TiO-ZrO mixed oxides impregnated by Pd and/or Au were studied in toluene total oxidation in a fixed bed microreactor and with {"}operando{"} DRIFT. Mesoporous TiO-ZrO mixed oxides with various Ti:Zr mole ratio of 80/20, 50/50 and 20/80, high surface areas were synthesised using a mixture of zirconium propoxide and titanium isoporopoxide as Zr and Ti sources and also CTMABr as surfactant. The new supports are impregnated by 0.5 or 1.5 wt{\%} of palladium and 1 wt{\%} of gold using impregnation and Deposition-Precipitation methods. The catalytic activity for the nanostructured mesoporous TiO-ZrO mixed oxides varies depending on the molar ratio of Ti:Zr and also for all series of the studied catalysts impregnated by Pd and/or Au, when the gold is loaded firstly the activity in toluene complete oxidation is higher than when Pd was deposited firstly (PdAu/TZ > 1.5Pd/TZ > AuPd/TZ > Pd/TZ > Au/TZ > TZ). The highest activity of PdAu/TZ (80/20) can be related to the higher acid sites density of the support and also to the presence of a synergetic effect between palladium and gold. {"}Operando{"} DRIFT allowed following the VOCs oxidation but also suggesting an interaction between the adsorbed molecule and the catalyst which decreases when the activity for oxidation reaction increases.",
author = "M. Hosseini and S. Siffert and R. Cousin and A. Abouka{\"i}s and Z. Hadj-Sadok and B.-L. Su",
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Total oxidation of VOCs on Pd and/or Au supported on TiO/ZrO followed by "operando" DRIFT. / Hosseini, M.; Siffert, S.; Cousin, R.; Aboukaïs, A.; Hadj-Sadok, Z.; Su, B.-L.

Dans: Comptes Rendus Chimie, Vol 12, Numéro 6-7, 01.06.2009, p. 654-659.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Total oxidation of VOCs on Pd and/or Au supported on TiO/ZrO followed by "operando" DRIFT

AU - Hosseini, M.

AU - Siffert, S.

AU - Cousin, R.

AU - Aboukaïs, A.

AU - Hadj-Sadok, Z.

AU - Su, B.-L.

PY - 2009/6/1

Y1 - 2009/6/1

N2 - Catalytic performances of nanostructured mesoporous TiO-ZrO mixed oxides impregnated by Pd and/or Au were studied in toluene total oxidation in a fixed bed microreactor and with "operando" DRIFT. Mesoporous TiO-ZrO mixed oxides with various Ti:Zr mole ratio of 80/20, 50/50 and 20/80, high surface areas were synthesised using a mixture of zirconium propoxide and titanium isoporopoxide as Zr and Ti sources and also CTMABr as surfactant. The new supports are impregnated by 0.5 or 1.5 wt% of palladium and 1 wt% of gold using impregnation and Deposition-Precipitation methods. The catalytic activity for the nanostructured mesoporous TiO-ZrO mixed oxides varies depending on the molar ratio of Ti:Zr and also for all series of the studied catalysts impregnated by Pd and/or Au, when the gold is loaded firstly the activity in toluene complete oxidation is higher than when Pd was deposited firstly (PdAu/TZ > 1.5Pd/TZ > AuPd/TZ > Pd/TZ > Au/TZ > TZ). The highest activity of PdAu/TZ (80/20) can be related to the higher acid sites density of the support and also to the presence of a synergetic effect between palladium and gold. "Operando" DRIFT allowed following the VOCs oxidation but also suggesting an interaction between the adsorbed molecule and the catalyst which decreases when the activity for oxidation reaction increases.

AB - Catalytic performances of nanostructured mesoporous TiO-ZrO mixed oxides impregnated by Pd and/or Au were studied in toluene total oxidation in a fixed bed microreactor and with "operando" DRIFT. Mesoporous TiO-ZrO mixed oxides with various Ti:Zr mole ratio of 80/20, 50/50 and 20/80, high surface areas were synthesised using a mixture of zirconium propoxide and titanium isoporopoxide as Zr and Ti sources and also CTMABr as surfactant. The new supports are impregnated by 0.5 or 1.5 wt% of palladium and 1 wt% of gold using impregnation and Deposition-Precipitation methods. The catalytic activity for the nanostructured mesoporous TiO-ZrO mixed oxides varies depending on the molar ratio of Ti:Zr and also for all series of the studied catalysts impregnated by Pd and/or Au, when the gold is loaded firstly the activity in toluene complete oxidation is higher than when Pd was deposited firstly (PdAu/TZ > 1.5Pd/TZ > AuPd/TZ > Pd/TZ > Au/TZ > TZ). The highest activity of PdAu/TZ (80/20) can be related to the higher acid sites density of the support and also to the presence of a synergetic effect between palladium and gold. "Operando" DRIFT allowed following the VOCs oxidation but also suggesting an interaction between the adsorbed molecule and the catalyst which decreases when the activity for oxidation reaction increases.

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M3 - Article

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EP - 659

JO - Comptes Rendus Chimie

JF - Comptes Rendus Chimie

SN - 1631-0748

IS - 6-7

ER -