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Pr. Elena BARANOVA

Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation (CCRI), University of Ottawa
When

Dec 07, 2016 à 10:30 AM
Where

Grande salle cbp LR6

Contact

C. Michel

Electrochemically Assisted Heterogeneous Catalysis: Metal-Support Interaction and Electrochemical Promotion in Nanostructured Catalytic Systems

Electrochemical Promotion of Catalysis (EPOC) also called Non-faradaic Electrochemical Modification of Catalytic Activity (NEMCA) is a general phenomenon in heterogeneous catalysis that enhances the activity and often the selectivity of catalysts [1]. EPOC or NEMCA refers to the pronounced and reversible changes in the catalytic properties of metal or metal oxide catalysts deposited on ionically conductive supports caused by the application of a small electrical stimuli (current or potential). The applied potential leads to the migration (backspillover) of ionic species from the support to the gas-exposed catalyst surface resulting in the modification of electronic properties of the catalysts. Electrochemical promotion and metal-support interaction (MSI) have long been viewed as two separate phenomena; however, more recently it has been shown that, functionally, for ionic and mixed ionic-electronic conducting materials, both are linked by the transfer of ionic species at the interfaces [2]. The difference between the two phenomena has been shown to be only operational. It has been said that EPOC is electrochemically controlled MSI; likewise, MSI is considered as self-induced EPOC. First, the concept of EPOC phenomenon and its origin will be presented, following by the discussion of EPOC and MSI at the Ru, Ir and Pt-based nano-structured catalyst interfaced with yttria-stabilized zirconia (Y2O3-ZrO2) and cerium oxide (CeO2) in the instance of ethylene and carbon monoxide oxidation reactions [3-5].

 

1. C. G. Vayenas, S. Bebelis, C. Pliangos, S. Brosda, and D. Tsiplakides, Electrochemical Activation of Catalysis: Promotion, Electrochemical Promotion, and Metal-Support Interactions, Kluwer Academic/Plenum Publishers, New York, (2001).

2. H.A.E. Dole, L.F. Safady, S. Ntais, M. Couillard, E.A. Baranova, J. Catal. 318 (2014) 85.

3. H.A.E. Dole, A.C.G.S.A. Costa, M. Couillard, E.A. Baranova, J. Catal. 333 (2016) 40.

4. R. J. Isaifan, S. Ntais, M. Couillard, E.A. Baranova, J. Catal. 324 (2015) 32.

5. H.A.E. Dole and E.A. Baranova, ChemCatChem 2016, 8, 1977.