Low-temperature CO oxidation over CuO-CeO2/SiO2 catalysts:Effect of CeO2 content and carrier porosity |
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作者单位: | Jingjie Luo,Wei Chu,Huiyuan Xu,Chengfa Jiang(Department of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China);Tao Zhang(Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China) |
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摘 要: |
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关 键 词: | 硅胶载体 CeO2 CO氧化 孔隙率 催化氧化 低温 催化剂活性 X射线衍射仪 |
收稿时间: | 24 December 2009 |
Low-temperature CO oxidation over CuO-CeO2/SiO2 catalysts: Effect of CeO2 content and carrier porosity |
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Authors: | Jingjie Luo Wei Chu Huiyuan Xu Chengfa Jiang Tao Zhang |
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Institution: | [1]Department of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China [2]Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China |
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Abstract: | The effects of CeO2 contents and silica carder porosity with their pore diameters ranging from 5.2 nm to 12.5 nm of CuO-CeO2/SiO2 catalysts in CO oxidation were investigated. The catalysts were characterized by N2 adsorption/desorption at low temperature, X-ray diffraction (XRD), temperature-programmed reduction by H2 (H2-TPR), oxygen temperature programmed desorption (O2-TPD) and X-ray photoelectron spectroscopy (XPS). The results suggested that, the ceria content and the porosity of SiO2 carder possessed great impacts on the structures and catalytic performances of CuO-CeO2/SiO2 catalysts. When appropriate content of CeO2(Ce content ≤8 wt%) was added, the catalytic activity was greatly enhanced. In the catalyst supported on silica carrier with larger pore diameter, higher dispersion of CuO was observed, better agglomeration-resistant capacity was displayed and more lattice oxygen could be found, thus the CuO-CeO2 supported on Si-1 showed higher catalytic activity for low-temperature CO oxidation. |
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Keywords: | CuO-CeO2 based catalyst silica carrier porosity carbon monoxide oxidation O2-TPD |
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