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Catalysts 2018, 8(12), 574;

Oscillatory Behavior of Pd-Au Catalysts in Toluene Total Oxidation

Laboratory of Inorganic Materials Chemistry, University of Namur, 61 Rue de Bruxelles, 5000 Namur, Belgium
Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV) E.A.4492, Université du Littoral Côte d’Opale, 145 Avenue Maurice Schumann, 59140 Dunkerque, France
Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, 59000 Lille, France
UMR CNRS 7197—UPMC, 4 Place Jussieu, Casier 178, 75005 Paris, France
Authors to whom correspondence should be addressed.
Received: 30 October 2018 / Revised: 16 November 2018 / Accepted: 18 November 2018 / Published: 22 November 2018
(This article belongs to the Special Issue Catalysts for Oxidative Destruction of Volatile Organic Compounds)
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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. View Full-Text
Keywords: oscillatory behavior; bimetallic catalysts; hierarchically porous; doping; titania; palladium; gold; VOC oxidation oscillatory behavior; bimetallic catalysts; hierarchically porous; doping; titania; palladium; gold; VOC oxidation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Barakat, T.; Rooke, J.C.; Chlala, D.; Cousin, R.; Lamonier, J.-F.; Giraudon, J.-M.; Casale, S.; Massiani, P.; Su, B.-L.; Siffert, S. Oscillatory Behavior of Pd-Au Catalysts in Toluene Total Oxidation. Catalysts 2018, 8, 574.

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