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Journal of Inorganic Materials

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2008 , Vol. 23 >Issue 3: 454 - 458

DOI: https://doi.org/10.3724/SP.J.1077.2008.00454

Research Paper

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
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  • Key Laboratory of Mesoscopic Chemistry of MOE, Department of Chemistry, Nanjing University, Nanjing 210093, China

Received date: 2007-07-23

  Revised date: 2007-10-11

  Online published: 2008-05-20

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Abstract

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

Cite this article

WANG Zhe , ZHAO Xi , WAN Hai-Qin , ZHU Jie , LIU Bin , DONG Lin . Influence of Calcination Temperature on the Dispersion Behavior and CO Oxidation Properties of CuO/γ-Al2O3 Catalyst[J]. Journal of Inorganic Materials, 2008 , 23(3) : 454 -458 . DOI: 10.3724/SP.J.1077.2008.00454

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