Abstract
In this study, Au/TiO2, Au/γ-Al2O3, and Au/C catalysts were prepared by an incipient-wetness impregnation method. The CO oxidation activity after different pretreatment was analyzed. Two pretreatments are found possible to activate these catalysts for CO oxidation: (i) high-temperature hydrogen reduction and (ii) aqueous base treatment using NH3(aq). The high-temperature hydrogen reduction is effective for Au/TiO2 and Au/C, but not Au/Al2O3. The base treatment is effective for Au/Al2O3 and Au/TiO2, but not Au/C. Small Au particles of ca. 2 nm size were observed in activated Au catalysts from both pretreatments; however, the high-temperature H2 reduction procedure also resulted in large Au particles of ca. 25 nm size which makes it a less efficient pretreatment than the base treatment. The activated Au/TiO2 catalysts show comparable turnover frequency as the Au/TiO2 catalyst prepared by a deposition precipitation method. The effective pretreatments were found to be accompanied by a reduced acidity, which is measured by the pH of aqueous catalyst suspension. Reasons for such activation are discussed.
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Shawn D. Lin is Professor of the Department of Chemical Engineering and Materials Science, Yuan Ze University, Taiwan. He received his Ph. D. degree from the Department of Chemical Engineering, Penn State University in 1992. His major research interest is catalysis, especially gold catalysts and metal catalysts for fuel cells and hydrocarbon conversions.
Hsin-Yen Tsai received his M. S. degree from the Department of Chemical Engineering and Materials Science, Yuan Ze University in 2004. He is now a process engineer in a semiconductor manufacturing company in Taiwan.
Wan-Ting Fu completed her M. S. degree study in July, 2007 and is considering an industrial position in the near future.
Yan-De Lin is a graduate student in S.D. Lin’s laboratory, working on the development of a more active Au/C catalyst.
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Tsai, HY., Lin, YD., Fu, WT. et al. The activation of supported Au catalysts prepared by impregnation. Gold Bull 40, 184–191 (2007). https://doi.org/10.1007/BF03215579
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DOI: https://doi.org/10.1007/BF03215579