title: Efficient Removal of Methane over Cobalt-Monoxide-Doped AuPd Nanocatalysts.
abstract: To overcome deactivation of Pd-based catalysts at high temperatures, we herein design a novel pathway by introducing a certain amount of CoO to the supported Au-Pd alloy nanoparticles (NPs) to generate high-performance Au-Pd-xCoO/three-dimensionally ordered macroporous (3DOM) Co3O4(x is the Co/Pd molar ratio) catalysts. The doping of CoO induced the formation of PdO-CoO active sites, which was beneficial for the improvement in adsorption and activation of CH4and catalytic performance. The Au-Pd-0.40CoO/3DOM Co3O4sample performed the best (T90%= 341 °C at a space velocity of 20 000 mL g-1h-1). Deactivation of the 3DOM Co3O4-supported Au-Pd, Pd-CoO, and Au-Pd-xCoO nanocatalysts resulting from water vapor addition was due to the formation and accumulation of hydroxyl on the catalyst surface, whereas deactivation of the Pd-CoO/3DOM Co3O4catalyst at high temperatures (680-800 °C) might be due to decomposition of the PdOyactive phase into aggregated Pd0NPs. The Au-Pd-xCoO/3DOM Co3O4nanocatalysts exhibited better thermal stability and water tolerance ability compared to the 3DOM Co3O4-supported Au-Pd and Pd-CoO nanocatalysts. We believe that the supported Au-Pd-xCoO nanomaterials are promising catalysts in practical applications for organic combustion.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Xie
authors.forename: Yuxi
authors.initials: Y
authors.lastname: Liu
authors.forename: Jiguang
authors.initials: J
authors.lastname: Deng
authors.forename: Simiao
authors.initials: S
authors.lastname: Zang
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales , Sydney, New South Wales 2052, Australia.
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Arandiyan
authors.forename: Hongxing
authors.identifier: 0000-0003-1738-0348
authors.initials: H
authors.lastname: Dai
mesh_terms: D000327:Adsorption; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry
chemical_list: D003035:Cobalt; D008697:Methane