Structure sensitivity of methane oxidation over platinum and palladium

Surface characterization study of a Pd/Co3O4 methane oxidation catalyst

“…Furthermore, different forms of PdO may exhibit different activities. For example, highly dispersed PdO may be less active than agglomerated or crystalline palladium oxide [4,12]. Further complications arise from the fact that the morphology of the PdO may change under reaction conditions with resulting changes in the catalytic performance.…”

“…A solution would be to employ a catalytic converter which would oxidize the non-combusted methane to carbon dioxide and water. A considerable amount of research on catalytic methane oxidation has been conducted over the past 20 years [2][3][4][5][6][7][8][9][10][11], and most of the studies have focused on alumina-supported Pd. Studies of support effects, reaction mechanism, kinetics, deactivation mechanisms and structure sensitivity have been reported [9][10][11].…”

Fundamentals and Applications of Ceria in Combustion Reactions

“…Thus in catalytic combustion molecular oxygen is generally dissociated in atoms which are strong oxidiser and strong electrophile as well [7]. Solids able to do that belong to two classes: i) noble metals [8,9,10,11,12] having the unique ability to dissociate 0 2 and C-H bond in atoms even at room temperature [13] ii) and transition metal oxides [3,13,14,15] able to release oxygen atoms at some higher temperature leading to suboxide and/or oxygen vacancies. The more covalent the oxide, the stronger the bond and the less the process to occur due to insulating character of the oxide [16].…”

Thermal deactivation of Pt/Rh commercial automotive catalysts

“…Similarly, Gélin and Primet [42] reported that complete methane oxidation can be structure sensitive. For example, Hicks et al [43] measured the catalytic activity of supported Pt and Pd catalysts under slightly oxidizing conditions. TOFs were calculated using the initial dispersion determined by chemisorption of hydrogen on the reduced samples before exposure to reaction conditions.…”