Influence of magnesia modification on the properties of copper oxide supported on γ-alumina

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• 作者：Zhe Wang ; Haiqin Wan ; Bin Liu ; Xi Zhao ; Xiaowei Li ; Haiyang Zhu ; Xuan Xu ; Fangying Ji ; Keqin Sun ; Lin Dong ; Yi Chen
• 关键词：Copper oxide ; Magnesia ; Dispersion capacity ; “ ; CO + O₂” ; reaction
• 刊名：Journal of Colloid and Interface Science
• 出版年：2008
• 出版时间：15 April 2008
• 年：2008
• 卷：320
• 期：2
• 页码：520-526
• 全文大小：609 K

文摘

XRD, BET, TPR, UV–vis DRS and in situ FT-IR were employed to investigate the dispersion, reduction and CO₂-adsorption behaviors of copper oxide supported on magnesia modified γ-Al₂O₃ (Mg–Al) samples. The results indicate that magnesia could be highly dispersed on the surface of γ-Al₂O₃ to form a monolayer and the dispersion capacity is about 1.55 mmol/(100 m² γ-Al₂O₃). For copper oxide supported on Mg–Al samples, both the dispersion capacity and the reduction temperature of surface CuO decrease with the MgO loading. CO₂-adsorption IR results show that the surface strong basic amount for the catalysts increases with the dispersed MgO loading. In addition, the activity of CO oxidation suggests that the main active species in this system should be small CuO cluster and the existence of dispersed MgO enhances the activity of CO oxidation. The catalysts might be applied in pollution control devices for vehicle exhaust, CO gas sensors, catalytic combustion and gas purification of CO₂ lasers. All the results have been discussed by the consideration of the variation of γ-Al₂O₃ surface structure before and after magnesia modification.