| Study on Chemisorption, Catalytic Behavior, and Stability of Supported Au Catalyst for the Propylene Epoxidation Reaction |
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| 作者姓名： | Feifei Sun Shunhe Zhong |
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| 作者单位： | Feifei Sun，Shunhe Zhong Department of Chemistry，School of Science，Tianjin University，Tianjin 300072，China College of Chemical Engineering and Technology，Tianjin University，Tianjin 300072，China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (29773031). |
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| 摘 要： | The supported Au/TiO2 and Au/TiO2-SiO2 catalysts were prepared by deposition precipitation method. The TPD study reveals that propylene oxide competes with propylene to be adsorbed on the same adsorptive center-Tin site on the surface of the catalyst and that the adsorbing capacity of the catalyst for propylene oxide is larger than that for propylene. Catalytic behavior for propylene epoxidation with H2 and O2 was tested in a micro-reactor. Under typical conditions, the selectivity for propylene oxide is over 87%. The TG curves show that PO successive oxidation cause carbon deposition on the active center and deactivation of the Au catalysts. Because the amounts of Tin site decrease significantly, and consequently the separation between Tin sites increases, the Au/TiO2-SiO2 catalyst is more stable than Au/TiO2.
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| 收稿时间： | 2005-11-24 |
| 修稿时间： | 2006-01-12 |
Study on Chemisorption, Catalytic Behavior, and Stability of Supported Au Catalyst for the Propylene Epoxidation Reaction |
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| Feifei Sun Shunhe Zhong.Study on Chemisorption, Catalytic Behavior, and Stability of Supported Au Catalyst for the Propylene Epoxidation Reaction[J].Journal of Natural Gas Chemistry,2006,15(1):45-51. |
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| Authors: | Feifei Sun Shunhe Zhong |
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| Institution: | aDepartment of Chemistry, School of Science, Tianjin University, Tianjin 300072, China;bCollege of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China |
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| Abstract: | The supported Au/TiO2 and Au/TiO2-SiO2 catalysts were prepared by deposition precipitation method. The TPD study reveals that propylene oxide competes with propylene to be adsorbed on the same adsorptive center-Tin site on the surface of the catalyst and that the adsorbing capacity of the catalyst for propylene oxide is larger than that for propylene. Catalytic behavior for propylene epoxidation with H2 and O2 was tested in a micro-reactor. Under typical conditions, the selectivity for propylene oxide is over 87%. The TG curves show that PO successive oxidation cause carbon deposition on the active center and deactivation of the Au catalysts. Because the amounts of Tin site decrease significantly, and consequently the separation between Tin sites increases, the Au/TiO2-SiO2 catalyst is more stable than Au/TiO2. |
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| Keywords: | Au/TiO2 Au/TiO2-SiO2 propylene propylene oxide epoxidation catalyst stability |
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