2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 10: Vayenas Intl. Symp. / Physical Chemistry and its applications for sustainable development
| Editors: | Vayenas Intl. Symp. / Physical Chemistry and its applications for sustainable development Edited by: F. Kongoli, E. Aifantis, C. Cavalca, A. de Lucas Consuegra, A. Efstathiou, M. Fardis, D. Grigoriou, A. Lemonidou, S.G. Neophytides, Y. Roman, M. Stoukides, M. Sullivan, P. Vernoux, X. Verykios, I. Yentekakis |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2019 |
| Pages: | 249 pages |
| ISBN: | 978-1-989820-09-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Electrochemical Promotion of Methane Oxidation over Nanodispersed Pd/Co3O4 Catalysts
Dimitrios Zagoraios1; Dimitrios Zagoraios2; Alexandros Katsaounis3; Angel Caravaca4; Ioanna Kalaitzidou4; Athanasia Athanasiadi5; Spyros Ntais4; Philippe Vernoux6; Constantinos Vayenas2;1UNIVERSITY OF PATRAS, DEPT. OF CHEMICAL ENGINEERING, Patras, Greece; 2UNIVERSITY OF PATRAS, Patras, Greece; 3DEPARTMENT OF CHEMICAL ENGINEERING, UNIVERSITY OF PATRAS, Patras, Greece; 4UNIVERSITY OF LYON, Lyon, France; 5UNIVERSITY OF PATRAS DEPT. OF CHEMICAL ENGINNERING, Patras, Achaia, Greece; 6UNIVERSITY LYON 1, Lyon, France;
Type of Paper: Regular
Id Paper: 59
Topic: 53
Abstract:
During the last two decades, the Electrochemical Promotion of Catalysis (EPOC) phenomenon has been studied extensively for many catalytic reactions, including hydrocarbon oxidation reactions and hydrogenations [1-3]. The EPOC effect is based on the modification of the work function of a metal, which also serves as a working electrode, leading to an alteration in the chemisorption bond strength of the reactants. This effect is observed when small currents or potentials are applied to a catalyst deposited on a solid electrolyte. In the majority of the studies, the catalysts/electrodes consisted of porous noble metal films (Pt, Pd, Rh) prepared, for instance, by calcination of organometallic pastes [4]. This results in low metal dispersion and low active surface area, therefore limiting the overall catalytic activity. In view of further practical application of the EPOC phenomenon to industrial catalysts, we should be able to enhance the activity of nanodispersed materials. In this study, for the very first time, we observed an enhanced catalytic activity of a Pd nanodispersed catalyst supported on a porous Co3O4 semiconductor film. The Pd/Co3O4 composite powder was deposited on an yttria-stabilized zirconia (YSZ) solid electrolyte without the presence of an interlayer film. The observed enhancement was non-Faradaic, with apparent Faradaic efficiency values as high as 80. The Pd/Co3O4 catalyst was characterized thoroughly by means of a wide variety of physicochemical techniques, such as TEM, SEM, TGA, ICP and BET. Using supported catalysts as catalytic films for electrochemical promotion studies may lead to the practical utilization of EPOC in the chemical industry or in gas exhaust treatment.
Keywords:
Electrochemical Promotion; Electrochemistry; Electrode potential; Catalyst electrode; Faradaic efficiency; Metal-support interactions; Solid electrolyte;References:
[1] C.G. Vayenas, S. Bebelis, I.V. Yentekakis, H.G. Lintz, Catal. Today. 11 (1992) 303-438.[2] C.G. Vayenas, S. Bebelis, C. Pliangos, S. Brosda, D. Tsiplakides Electrochemical Activation of Catalysis: Promotion, Electrochemical Promotion and Metal-Support Interactions, Kluwer Academic/Plenum Publishers, New York, 2001.
[3] C.G. Vayenas, J. Solid State Electrochem. 7-8 (2011) 1425-1435.
[4] C. Jimenez-Borja, S. Brosda, F. Matei, M. Makri, B. Delgado, F. Sapountzi, D. Ciuparu, F. Dorado, J.L. Valverde, C.G. Vayenas, Appl. Catal. B Environ. 128 (2012) 48-54.