Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (06): 1023-1029.doi: 10.3866/PKU.WHXB20080619

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Preparation and Characterization of CuO/Ce0.5Ti0.5O2 and Its Catalytic Activity for NO+CO Reaction

ZHAO Xiu-Hua; JIANG Xiao-Yuan; CHEN Hong-Hua; ZHENG Xiao-Ming   

  1. Institute of Catalysis, Department of Chemistry, College of Science, Zhejiang University, Hangzhou 310028, P. R. China
  • Received:2007-11-27 Revised:2008-03-18 Published:2008-06-03
  • Contact: JIANG Xiao-Yuan E-mail:xyjiang@mail.hz.zj.cn

Abstract: Using Ce0.5Ti0.5O2 as carrier, CuO/Ce0.5Ti0.5O2 catalysts with different CuO loadings were prepared by the impregnation method. The catalytic activities of the catalysts for NO+CO reaction were examined with a micro-reactor gas chromatography reaction system and the catalysts were characterized by of TPR, XRD, and Raman spectroscopy. It was found that the activity of CuO/Ce0.5Ti0.5O2 for NO+CO reaction was depended on CuO loading, and became maximal when CuO loading was 22% and the calcined temperature was 500 ℃. However, after calcination at 700 ℃ 14%CuO/Ce0.5Ti0.5O2 had the highest activity, possibly due to the formation of CeTi2O6-mixed oxide. The TPR analysis showed that CuO/Ce0.5Ti0.5O2 had four TPRreduction peaks (α, β, γ, and δ peaks). The α and β peaks were the reduction of highly dispersed CuO species; the γpeak was due to the isolated bulk CuO interacted intensively with Ce0.5Ti0.5O2; and the δ peak was due to the bulk CuO on the surface of CuO/Ce0.5Ti0.5O2. As shown by XRD, CuO/Ce0.5Ti0.5O2 calcined at 700 ℃ had new oxide CeTi2O6, and the diffraction peaks of CeTi2O6 became obvious as the calcined temperature increased, indicating that high temperature enhanced solid reaction of Ce and Ti, and formation of CeTi2O6. The Raman results indicated that after calcination Ce0.5Ti0.5O2 was no longer a simple combination of TiO2 and CeO2, but had formed new crystal structure.

Key words: CuO/Ce0.5Ti0.5O2, NO+CO reaction, CeTi2O6, Raman spectroscopy

MSC2000: 

  • O643.3