Uranium oxide-supported gold catalyst for water–gas shift reaction
| Autor: | Zhanghuai Suo, Wei-ping Liao, Yuan-Yuan Dong |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
inorganic chemicals
Chemistry General Chemical Engineering Inorganic chemistry Oxide Energy Engineering and Power Technology Microporous material Water-gas shift reaction Catalysis Metal chemistry.chemical_compound Fuel Technology visual_art visual_art.visual_art_medium Uranium oxide Mesoporous material Incipient wetness impregnation |
| Zdroj: | Fuel Processing Technology. 137:164-169 |
| ISSN: | 0378-3820 |
| DOI: | 10.1016/j.fuproc.2015.04.018 |
| Popis: | The orange yellow UO 3 and bottle green U 3 O 8 phases were prepared by thermal decomposition of uranyl nitrate hexahydrate at 400 °C and 500 °C, respectively. Gold catalysts supported on two oxides were prepared by incipient wetness impregnation for water–gas shift reaction. The gold catalysts were characterized by the techniques such as nitrogen physical adsorption, X-ray diffraction, temperature-programmed reduction, and X-ray photoelectron spectroscopy. The Au/UO 3 catalyst has both microporous and mesoporous structures while the Au/U 3 O 8 catalyst has only microporous structure. The presence of gold on the oxide surface greatly facilitates the reduction of uranium oxide support. The active sites for water–gas shift reaction are likely dominant metallic gold with a small portion of oxidized gold species due to UO 2 + /U 4 + redox property. The Au/UO 3 catalyst shows higher activity with 55% conversion of CO in comparison with Au/U 3 O 8 . High activity on Au/UO 3 catalyst is attributed to facile the reducibility of UO 3 and its high surface gold atomic concentration. |
| Databáze: | OpenAIRE |
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