Gold catalysts supported on ZnO/AlO for low-temperature CO oxidation

Kim, Ki-Joong; Seo, Hyeong-Seok; Ahn, Ho-Geun
November 2011
Research on Chemical Intermediates;Nov2011, Vol. 37 Issue 9, p1165
Academic Journal
Gold catalysts with loadings ranging from 0.5 to 7.0 wt% on a ZnO/AlO support were prepared by the deposition-precipitation method (Au/ZnO/AlO) with ammonium bicarbonate as the precipitation agent and were evaluated for performance in CO oxidation. These catalysts were characterized by inductively coupled plasma-atom emission spectrometry, temperature programmed reduction, and scanning transmission electron microscopy. The catalytic activity for CO oxidation was measured using a flow reactor under atmospheric pressure. Catalytic activity was found to be strongly dependent on the reduction property of oxygen adsorbed on the gold surface, which related to gold particle size. Higher catalytic activity was found when the gold particles had an average diameter of 3-5 nm; in this range, gold catalysts were more active than the Pt/ZnO/AlO catalyst in CO oxidation. Au/ZnO/AlO catalyst with small amount of ZnO is more active than Au/AlO catalyst due to higher dispersion of gold particles.


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