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CO oxidation at low temperature over Pd supported on CeO2-TiO2 composite oxide |
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| Authors: | Huaqing Zhu Zhangfeng Qin Wenjuan Shan Wenjie Shen Jianguo Wang |
| Affiliation: | aState Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, PR China bState Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, Dalian, Liaoning 116023, PR China |
| Abstract: | Low temperature CO oxidation was carried out over CeO2-TiO2 composite oxide and thereon supported Pd catalysts. The effects of Ce/Ti ratio and pre-treatments of calcination and reduction on the catalytic behaviour were investigated. The CO oxidation starts at about 220 °C over CeO2-TiO2 and the pre-reduction treatment has little influence on the catalytic activity. Pd supported on CeO2-TiO2 (Pd/CeO2-TiO2) exhibits high activity for CO oxidation and a complete conversion of CO to CO2 can be achieved even at ambient temperature, which suggests a synergistic effect between Pd and CeO2-TiO2. The activity and stability of Pd/CeO2-TiO2 can be further improved by the pre-reduction treatment. Ce/Ti ratio influences the catalytic behaviour significantly; the catalyst Pd/CeO2-TiO2 with a Ce/Ti mole ratio of 0.20 (Pd/Ce20Ti) owns the highest activity and stability, which suggests an optimization of the Pd-Ce-Ti interaction in Pd/Ce20Ti. The calcined Pd/CeO2-TiO2 with a Ce/Ti mole ratio higher than 0.10 shows a distorted light-off profile with the temperature, which implies an alternation of the reaction mechanism with increasing temperature. |
| Keywords: | CO oxidation Palladium Ceria Titania DRIFTS Composite oxide CeO2-TiO2 |
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