Role of Lattice Oxygen in the Propane Combustion Over Pt/Yttria-Stabilized Zirconia : Isotopic Studies

Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

“…As was shown recently, under the reaction conditions of catalytic oxidation of hydrocarbons and CO, the interaction between Pt NPs and ionically conductive ceramics (YSZ and samarium doped ceria) leads to migration of lattice oxygen ions to the surface of Pt, resulting in changes of the adsorption properties of the catalyst and in reaction rate increase [56][57][58][59]. The state of the surface of Pt NPs under reaction conditions is similar to a surface state which is achieved under electrochemical promotion of thin continuous Pt catalyst-electrode films [1,59].…”

“…As was shown recently, under the reaction conditions of catalytic oxidation of hydrocarbons and CO, the interaction between Pt NPs and ionically conductive ceramics (YSZ and samarium doped ceria) leads to migration of lattice oxygen ions to the surface of Pt, resulting in changes of the adsorption properties of the catalyst and in reaction rate increase [56][57][58][59]. The state of the surface of Pt NPs under reaction conditions is similar to a surface state which is achieved under electrochemical promotion of thin continuous Pt catalyst-electrode films [1,59]. The phenomenon of electrochemical promotion of catalysis (EPOC) or non-faradaic electrochemical modification of catalytic activity (NEMCA) allows to significantly improve the catalytic activity and in some cases selectivity of the catalyst-electrode in a solid-electrolyte electrochemical cell by applying small electrical stimuli and thus supplying/removing lattice O d-(in the case of YSZ) to/from the catalyst electrode surface and modifying the catalytic oxidation reaction [60][61][62][63].…”

Size-dependent activity of Pt/yttria-stabilized zirconia catalyst for ethylene and carbon monoxide oxidation in oxygen-free gas environment

“…In the presence of oxygen, the mechanism of CO and C 2 H 4 oxidation over Pt NPs supported on YSZ was described earlier [7][8][9][11][12][13]15]) and involves thermally driven backspillover of O 2À species from YSZ through tpb to the gas-exposed Pt surface. In this case, MSI for Pt/YSZ catalyst is functionally identical to EPOC as was initially demonstrated by Nicole et al [9] and was later termed 'self-induced EPOC' [7].…”

“…One would expect that the rate of backspillover will increase with temperature and as the catalyst particle size decreases. In the excess of oxygen, the electrochemical reactions at tpb occur simultaneously with O 2À backspillover and the oxidation reaction over the gas-exposed Pt; however, the rate of the electrochemical process at tpb is low and catalytic oxidation and O 2À backspillover dominate [7,8,15].…”

“…Several recent studies demonstrated that YSZ can finely disperse and stabilize nanoparticles and strongly enhance the catalytic activity of metal or metal oxide nanostructured catalysts through the action of the thermally induced O 2À promoters [11][12][13][14], which makes it very promising support material in heterogeneous catalysis [11][12][13][14]. Recently, Vernoux and coworkers carried out isotopic studies of propane combustion on Pt nanoparticles supported on YSZ [15]. They confirmed that propane is preferentially oxidized by lattice YSZ oxygen species on Pt/YSZ via the sacrificial promoter-type mechanism, contrary to Pt/SiO 2 and Pt/ZrO 2 catalysts, where only gaseous oxygen is available for the reaction.…”