Reversed Micelles Synthesized Manganese-Doped Cerium Oxide Copper Catalysts in Selective CO Oxidation
| Autor: | Yi Shan Chen, 陳怡珊 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Copper oxide impregnated on manganese-doped ceria prepared by reverse microemulsion was used as catalysts to study selective CO oxidation in a rich hydrogen environment. It was found that catalysts prepared by microemulsion have better activity performance than those made by co-precipitation method. Therefore, reverse microemulsion method was adopted in this study to prepare ceria of different percentages of manganese doping for the selective CO oxidation. Activity test results showed that the best activity performance was obtained by the catalyst of 10% manganese-doped ceria, which displays a CO conversion of 52% at 70℃ and almost 98% at 95℃, while still achieving a high CO selectivity of almost 100% due to little hydrogen consumption. However, exceeding 100℃ hydrogen gradually reacts with oxygen resulting in a decrease in selectivity. In addition, from the competitive oxidation tests of CO and H2 at 120℃, it has been demonstrated that CO is more easily oxidized than H2. The catalysts studied in this work can exhibit high CO selectivity and low hydrogen consumption at low temperatures. Activity results also match with those of BET surface area and TEM characterizations. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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