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Selective removal of CO from hydrogen-rich stream over CuO/CexSn1−xO2–Al2O3 catalysts |
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| Authors: | Yin-Zu Chen Biing-Jye Liaw Jung-Man Wang Ching-Tsuen Huang |
| Affiliation: | aDepartment of Chemical and Materials Engineering, National Central University, Jhongli 32001, Taiwan, ROC bDepartment of Chemical and Materials Engineering, Nanya Institute of Technology, Jhongli 32091, Taiwan, ROC cInstitute of Nuclear Energy Research Atomic Energy Council, Longtan 32546, Taiwan, ROC |
| Abstract: | The solid solutions of CexSn1?xO2 incorporated with alumina to form CexSn1?xO2–Al2O3 mixed oxides, by the suspension/co-precipitation method, were used to prepare CuO/CexSn1?xO2–Al2O3 catalysts for the selective oxidation of CO in excess hydrogen. Incorporating Al2O3 increased the dispersion of CexSn1?xO2, but did not change their main structures and did not weaken their redox properties. Doping Sn4+ into CeO2 increased the mobility of lattice oxygen and enhanced the activity of the 7%CuO/CexSn1?xO2–Al2O3 catalyst in the selective oxidation of CO. The selective oxidation of CO was weakened as the doped fraction of Sn4+ exceeded 0.5. Incorporating appropriate amounts of Sn4+ and Al2O3 could obtain good candidates 7%CuO/CexSn1?xO2–Al2O3(20%), 1–x=0.1–0.5, for a preferential oxidation (PROX) unit in a polymer electrolyte membrane fuel cell system for removing CO. Its activity was comparable with, and its selectivity was much larger than, that of the noble catalyst 5%Pt/Al2O3. |
| Keywords: | CO Selective oxidation CuO catalyst CeO2 oxide CexSn1?xO2–Al2O3 mixed oxides |
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