title: Complete oxidation of ethylene over supported gold nanoparticle catalysts.
abstract: Complete oxidation of ethylene was performed over supported noble metals or transition metals oxide catalysts and on monoliths under atmospheric pressure. Gold nanoparticles on Al2O3 or MxOy(M = Mo, Fe, Mn) were prepared by impregnation, coprecipitation, deposition, and dispersion methods. Nanoparticles prepared by impregnation method were irregular and very large above 25 nm, but those by coprecipitation and deposition method were uniformly nanosized at 4-5 nm. The gold nanoparticle were outstandingly active in catalyzing oxidation of ethylene. The activity order of these catalysts with preparation methods was deposition > coprecipitation > impregnation, and Au/Co3O4 prepared by deposition method showed the best performance in ethylene oxidation. The addition of gold particles to MxOy/Al2O3 catalyst enhanced the ethylene oxidation activity significantly. The main role of the gold nanoparticles apparently was to promote dissociative adsorption of oxygen and to enhance the reoxidation of the catalyst.
authors.affiliation: Department of Chemical Engineering, Sunchon National University, 315 Maegok-dong, Suncheon-si, Jeonnam 540-742, Korea.
authors.forename: Ho-Geun
authors.initials: HG
authors.lastname: Ahn
authors.forename: Byoung-Min
authors.initials: BM
authors.lastname: Choi
authors.forename: Do-Jin
authors.initials: DJ
authors.lastname: Lee
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D002384:Catalysis; D005030:Ethylenes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D013696:Temperature
chemical_list: D005030:Ethylenes; D008670:Metals; D010087:Oxides; D006046:Gold; C036216:ethylene; D000537:Aluminum Oxide; D010100:Oxygen