caa a22 4500 606174478 CHVBK 20210128100738.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s11244-015-0494-6 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0494-6 Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation [Elektronische Daten] [Rima Isaifan, William Penwell, Joao Filizzola, Javier Giorgi, Elena Baranova] The novel Sm1−xCexFeO3−δ (x=0, 0.01, 0.05) (SCF) perovskites with and without 1wt% of Pt nanoparticles (NPs) were investigated for carbon monoxide and ethylene oxidation in the temperature range of 25-350°C. All perovskites were predominantly ionic conductors, with ionic conductivities two orders of magnitude higher than the electronic contribution. Furthermore, the cerium doping increases the ionic conductivity of these materials at high temperatures. The bare SCF perovskites possessed catalytic activity for both reactions; however the Pt-supported catalysts had 50-100°C lower light-off temperatures than the corresponding perovskites. More significantly, the enhancement in the catalytic activity of the Pt/SCF family with respect to other Pt-supported catalysts was shown by the lower activation energies, which were 25.7kJ/mol over Pt/Sm0.95Ce0.05FeO3−δ and 18.3kJ/mol over Pt/Sm0.99Ce0.01FeO3−δ for CO and ethylene oxidation, respectively. The corresponding activation energies for Pt NPs supported on conventional γ-Al2O3 were 57.1 and 32kJ/mol, and on ionically conductive yttria-stabilized zirconia (YSZ) were 35.8 and 22kJ/mol for CO and C2H4 oxidation, respectively. The increased activity was attributed to the high ionic conductivity (O2−) of the perovskite supports at 100-400°C that facilitates the spontaneous backspillover of O2− promoters from the lattice to the gas-exposed Pt nanoparticle surface. The promoters alter the adsorption strength of reactants similar to the electrochemical promotion mechanism observed under polarization. Springer Science+Business Media New York, 2015 Perovskites nationallicence Platinum nanoparticles nationallicence Ionic conductivity nationallicence Carbon monoxide nationallicence Ethylene nationallicence Electrochemical promotion nationallicence Isaifan Rima Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut Penwell William Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut Filizzola Joao Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut Giorgi Javier Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut Baranova Elena Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/18-20(2015-11-01), 1218-1227 1022-5528 58:18-20<1218 2015 58 11244 https://doi.org/10.1007/s11244-015-0494-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0494-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Isaifan Rima Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Penwell William Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Filizzola Joao Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Giorgi Javier Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Baranova Elena Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis-Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/18-20(2015-11-01), 1218-1227 1022-5528 58:18-20<1218 2015 58 11244