Journal of Inorganic Materials

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Influence of Calcination Temperature on the Dispersion Behavior and CO Oxidation Properties of CuO/γ-Al2O3 Catalyst

WANG Zhe, ZHAO Xi, WAN Hai-Qin, ZHU Jie, LIU Bin, DONG Lin   

  1. Key Laboratory of Mesoscopic Chemistry of MOE, Department of Chemistry, Nanjing University, Nanjing 210093, China
  • Received:2007-07-23 Revised:2007-10-11 Published:2008-05-20 Online:2008-05-20


CuO/γ-Al2O3 samples were prepared by impregnating γ-Al2O3 with an aqueous solution containing requisite amount of Cu(NO3)2. BET, XRD, UV-DRS, H2-TPR and CO oxidation were employed to characterize the dispersion, reduction behavior and catalytic properties of CuO/γ-Al2O3 catalyst calcinated at different temperatures. The results indicate that the dispersion capacity of CuO on the surface of γ-Al2O3 is about 0.56mmol/100m2 when it is calcinated at 450℃; while for the samples calcinated at 750℃, Cu2+ would occupy both the octahedral and tetrahedral vacant sites on the (110) plane of γ-Al2O3. For samples with low CuO loading amount, only the reduction peak of Cu2+ in octahedral coordination environment is observed in xxCu/Al-450 samples; while for xx Cu/Al-750 samples, the reduction peaks of Cu2+ in octahedral and tetrahedral coordination environment can be observed and the reduction of Cu2+ in octahedral coordination environment would promote the reduction of Cu2+ in tetrahedral coordination environment. The CO oxidation results indicate that the activity of dispersed CuO species in octahedral coordination environment is higher than that in tetrahedral coordination environment.

Key words: CuO/γ-Al2O3, CO oxidation, calcination temperature

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