Characterizations of alumina-supported gold with temperature-programmed reduction
作者： Chao-Kang Chang , Yeong-Jey Chen , Chuin-tih Yeh
DOI: 10.1016/S0926-860X(98)00188-4
关键词: Analytical chemistry 、 Catalysis 、 Temperature-programmed reduction 、 Crystallography 、 Chemistry 、 X-ray crystallography 、 Sintering 、 Adsorption 、 Crystallite 、 Transmission electron microscopy 、 Stoichiometry
摘要: Abstract Supported Au/Al 2 O 3 samples of different gold loadings were prepared by the deposition-precipitation AuCl onto alumina. Prepared physically characterized techniques atomic emission (ICP), X-ray diffraction (XRD), transmission electron microscope (TEM) and temperature-programmed reduction (TPR). According to TEM XRD observations, size crystallites dispersed on freshly at 300 K was ca. 8 nm. TPR characterizations oxidized distinguished three kinds reductive peaks temperatures 180, 300 1000 K. These are attributed reductions oxides (Au s x ) chloride Cl y surface supported crystallites, ions i incorporated into subsurface alumina support, respectively. The stoichiometry Au increased with temperature oxidation treatment ( T 0 attained a peak value 2.0 =600 K. Using this adsorption stoichiometry, variations in dispersions determined. Through dispersion measurements, nano-crystallites found sinter >673 K both oxidative environments.
elsevier.com
sci-hub.se 参考文章(10)
Robert M. Smith, Arthur Earl Martell, Critical Stability Constants ,(2011)
Michel Boudart, G. Djega-Mariadassou, Kinetics of Heterogeneous Catalytic Reactions ,(1984)
Yih-Ming Kang, Ben-Zu Wan, Preparation of gold in Y-type zeolite for carbon monoxide oxidation Applied Catalysis A-general. ,vol. 128, pp. 53- 60 ,(1995) , 10.1016/0926-860X(95)00076-3
Y Kang, Pretreatment effect of gold/iron/zeolite-y on carbon monoxide oxidation Catalysis Today. ,vol. 26, pp. 59- 69 ,(1995) , 10.1016/0920-5861(95)00070-V
T. Y Chou, C. P. Hwang, C. T. Yeh, Graphic determination of kinetic parameters in temperature-programmed desorption of oxygen from alumeva-supported PdO Journal of Thermal Analysis and Calorimetry. ,vol. 46, pp. 305- 315 ,(1996) , 10.1007/BF01979970
Gratian R. Bamwenda, Susumu Tsubota, Toshiko Nakamura, Masatake Haruta, Photoassisted hydrogen production from a water-ethanol solution: a comparison of activities of AuTiO2 and PtTiO2 Journal of Photochemistry and Photobiology A-chemistry. ,vol. 89, pp. 177- 189 ,(1995) , 10.1016/1010-6030(95)04039-I
Masatake Haruta, Size- and support-dependency in the catalysis of gold Catalysis Today. ,vol. 36, pp. 153- 166 ,(1997) , 10.1016/S0920-5861(96)00208-8
Chin-Pei Hwang, Chuin-Tih Yeh, Platinum-oxide species formed by oxidation of platinum crystallites supported on alumina Journal of Molecular Catalysis A-chemical. ,vol. 112, pp. 295- 302 ,(1996) , 10.1016/1381-1169(96)00127-6
M.C. Kung, J.-H. Lee, A. Chu-Kung, H.H. Kung, Selective reduction of NOx by propene over Au/γ-Al2O3 catalysts Studies in Surface Science and Catalysis. ,vol. 101, pp. 701- 710 ,(1996) , 10.1016/S0167-2991(96)80281-3
Michel Boudart, G. Djega-Mariadassou, Kinetics of Heterogeneous Catalytic Reactions Princeton University Press. ,(1984) , 10.1515/9781400853335