AI Article Synopsis
- Complete oxidation of ethylene was studied using various noble metal and transition metal oxide catalysts, particularly gold nanoparticles on Al2O3 and MxOy, under atmospheric pressure.
- Gold nanoparticles prepared via different methods (impregnation, coprecipitation, deposition) varied in size, with deposition yielding the most uniform and smallest particles at 4-5 nm, leading to higher catalytic activity.
- The activity ranking of the catalysts based on preparation methods was deposition > coprecipitation > impregnation, with Au/Co3O4 showing the highest performance, largely due to gold's role in enhancing oxygen adsorption and catalyst reoxidation.
Article 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.
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