Oscillatory behavior of Pd-Au catalysts in toluene total oxidation

Tarek Barakat, Joanna C. Rooke, Dayan Chlala, Renaud Cousin, Jean François Lamonier, Jean Marc Giraudon, Sandra Casale, Pascale Massiani, Bao Lian Su, Stéphane Siffert

Résultats de recherche: Contribution à un journal/une revueArticle

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In this work, the activity of bimetallic Pd-Au doped hierarchically structured titania catalysts has been investigated in the total oxidation of toluene. In earlier works, doping titania with group Vb metal oxides ensured an increased catalytic performance in the elimination of VOC molecules. A synergy between gold and palladium loaded at the surface of titania supports provided better performances in VOC oxidation reactions. Therefore, the main focus in this work was to investigate the durability of the prepared catalysts under long time-on-stream periods. Vanadium-doped catalysts showed a stable activity throughout the whole 110 h test, whereas, surprisingly, niobium-doped catalysts presented a cycle-like activity while nevertheless maintaining a high performance in toluene elimination. Operando Diffuse Reflectance Infrared Fourrier Transform spectroscopy (DRIFT) experiments revealed that variations in the presence of OH radicals and the presence of carbonaceous compounds adsorbed at the surface of spent catalysts varies with the occurrence of oscillations. X-ray Photoelectron Spectroscopy (XPS) results show that interactions between the material and the active phase provided extra amounts of mobile oxygen species and participated in easing the reduction of palladium. An enhanced redox reaction scheme is thus obtained and allows the occurrence of the cyclic-like performance of the catalyst.

langue originaleAnglais
Numéro d'article574
Nombre de pages11
journalCatalysts
Volume8
Numéro de publication12
Les DOIs
étatPublié - 1 déc. 2018

Empreinte digitale

Toluene
toluene
catalysts
Oxidation
oxidation
Catalysts
titanium
Titanium
volatile organic compounds
Palladium
Volatile organic compounds
palladium
elimination
Niobium
occurrences
Vanadium
Redox reactions
durability
niobium
Gold

Citer ceci

Barakat, Tarek ; Rooke, Joanna C. ; Chlala, Dayan ; Cousin, Renaud ; Lamonier, Jean François ; Giraudon, Jean Marc ; Casale, Sandra ; Massiani, Pascale ; Su, Bao Lian ; Siffert, Stéphane. / Oscillatory behavior of Pd-Au catalysts in toluene total oxidation. Dans: Catalysts. 2018 ; Vol 8, Numéro 12.
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title = "Oscillatory behavior of Pd-Au catalysts in toluene total oxidation",
abstract = "In this work, the activity of bimetallic Pd-Au doped hierarchically structured titania catalysts has been investigated in the total oxidation of toluene. In earlier works, doping titania with group Vb metal oxides ensured an increased catalytic performance in the elimination of VOC molecules. A synergy between gold and palladium loaded at the surface of titania supports provided better performances in VOC oxidation reactions. Therefore, the main focus in this work was to investigate the durability of the prepared catalysts under long time-on-stream periods. Vanadium-doped catalysts showed a stable activity throughout the whole 110 h test, whereas, surprisingly, niobium-doped catalysts presented a cycle-like activity while nevertheless maintaining a high performance in toluene elimination. Operando Diffuse Reflectance Infrared Fourrier Transform spectroscopy (DRIFT) experiments revealed that variations in the presence of OH radicals and the presence of carbonaceous compounds adsorbed at the surface of spent catalysts varies with the occurrence of oscillations. X-ray Photoelectron Spectroscopy (XPS) results show that interactions between the material and the active phase provided extra amounts of mobile oxygen species and participated in easing the reduction of palladium. An enhanced redox reaction scheme is thus obtained and allows the occurrence of the cyclic-like performance of the catalyst.",
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Barakat, T, Rooke, JC, Chlala, D, Cousin, R, Lamonier, JF, Giraudon, JM, Casale, S, Massiani, P, Su, BL & Siffert, S 2018, 'Oscillatory behavior of Pd-Au catalysts in toluene total oxidation', Catalysts, VOL. 8, Numéro 12, 574. https://doi.org/10.3390/catal8120574

Oscillatory behavior of Pd-Au catalysts in toluene total oxidation. / Barakat, Tarek; Rooke, Joanna C.; Chlala, Dayan; Cousin, Renaud; Lamonier, Jean François; Giraudon, Jean Marc; Casale, Sandra; Massiani, Pascale; Su, Bao Lian; Siffert, Stéphane.

Dans: Catalysts, Vol 8, Numéro 12, 574, 01.12.2018.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Oscillatory behavior of Pd-Au catalysts in toluene total oxidation

AU - Barakat, Tarek

AU - Rooke, Joanna C.

AU - Chlala, Dayan

AU - Cousin, Renaud

AU - Lamonier, Jean François

AU - Giraudon, Jean Marc

AU - Casale, Sandra

AU - Massiani, Pascale

AU - Su, Bao Lian

AU - Siffert, Stéphane

PY - 2018/12/1

Y1 - 2018/12/1

N2 - In this work, the activity of bimetallic Pd-Au doped hierarchically structured titania catalysts has been investigated in the total oxidation of toluene. In earlier works, doping titania with group Vb metal oxides ensured an increased catalytic performance in the elimination of VOC molecules. A synergy between gold and palladium loaded at the surface of titania supports provided better performances in VOC oxidation reactions. Therefore, the main focus in this work was to investigate the durability of the prepared catalysts under long time-on-stream periods. Vanadium-doped catalysts showed a stable activity throughout the whole 110 h test, whereas, surprisingly, niobium-doped catalysts presented a cycle-like activity while nevertheless maintaining a high performance in toluene elimination. Operando Diffuse Reflectance Infrared Fourrier Transform spectroscopy (DRIFT) experiments revealed that variations in the presence of OH radicals and the presence of carbonaceous compounds adsorbed at the surface of spent catalysts varies with the occurrence of oscillations. X-ray Photoelectron Spectroscopy (XPS) results show that interactions between the material and the active phase provided extra amounts of mobile oxygen species and participated in easing the reduction of palladium. An enhanced redox reaction scheme is thus obtained and allows the occurrence of the cyclic-like performance of the catalyst.

AB - In this work, the activity of bimetallic Pd-Au doped hierarchically structured titania catalysts has been investigated in the total oxidation of toluene. In earlier works, doping titania with group Vb metal oxides ensured an increased catalytic performance in the elimination of VOC molecules. A synergy between gold and palladium loaded at the surface of titania supports provided better performances in VOC oxidation reactions. Therefore, the main focus in this work was to investigate the durability of the prepared catalysts under long time-on-stream periods. Vanadium-doped catalysts showed a stable activity throughout the whole 110 h test, whereas, surprisingly, niobium-doped catalysts presented a cycle-like activity while nevertheless maintaining a high performance in toluene elimination. Operando Diffuse Reflectance Infrared Fourrier Transform spectroscopy (DRIFT) experiments revealed that variations in the presence of OH radicals and the presence of carbonaceous compounds adsorbed at the surface of spent catalysts varies with the occurrence of oscillations. X-ray Photoelectron Spectroscopy (XPS) results show that interactions between the material and the active phase provided extra amounts of mobile oxygen species and participated in easing the reduction of palladium. An enhanced redox reaction scheme is thus obtained and allows the occurrence of the cyclic-like performance of the catalyst.

KW - Bimetallic catalysts

KW - Doping

KW - Gold

KW - Hierarchically porous

KW - Oscillatory behavior

KW - Palladium

KW - Titania

KW - VOC oxidation

UR - http://www.scopus.com/inward/record.url?scp=85057426790&partnerID=8YFLogxK

U2 - 10.3390/catal8120574

DO - 10.3390/catal8120574

M3 - Article

AN - SCOPUS:85057426790

VL - 8

JO - Catalysts

JF - Catalysts

SN - 2073-4344

IS - 12

M1 - 574

ER -