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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 1: 71 - 76

DOI: https://doi.org/10.3724/SP.J.1077.2008.00071

Research Paper

Preparation of Titanium-Zirconium Mixed Oxide and its Catalytic Performance of Pt Three-way Catalysts

  • YU Yao ,
  • LIN Tao ,
  • ZHANG Li-Juan ,
  • GUO Jia-Xiu ,
  • GONG Mao-Chu ,
  • CHEN Yao-Qiang
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  • (College of Chemistry, Sichuan University, Chengdu 610064, China)

Received date: 2007-03-31

  Revised date: 2007-06-22

  Online published: 2008-01-20

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Abstract

Zr0.5 Ti0.5 O2 mixed oxides were prepared by co-precipitation method. The effects of pH value, precipitation temperature and calcination temperature of Zr0.5 Ti0.5O 2 on its specific surface area, pore size, pore volume and surface acidity were investigated. The samples calcined at 500℃, 550℃, 600℃, 650℃, 700℃, 800℃ for 2h, were characterized by means of BET, X-ray diffraction (XRD) and NH3-temperature programmed desorption (NH3-TPD). Using the Zr0.5Ti0.5O2 and La-Al2O3 as catalyst carriers, and the activities of Pt/Zr0.5 Ti0.5O2 and Pt/La-Al2O3 catalysts were evaluated in the simulated gas. The results show that when the pH is 11, precipitation temperature is 25℃, calcination temperature is 550℃, Zr0.5Ti0.5O2 exhibits the highest specific surface area(195m2·-1), larger pore volume(0.28mL·g -1), proper surface acidic amount and acidity. Compared with Pt/La-Al2O3, Pt/Zr0.5Ti0.5O2 exhibits excellent low-temperature catalytic activity and lower the light-off temperature of hydrocarbon (234℃) and carbon monoxide (203℃) and nitrogen oxides (213℃). At the same time, it is found that the Pt/Zr0.5Ti0.5O2 catalysts significantly improve the conversion for nitrogen oxides.

Key words： Zr0.5Ti0.5O2 mixed oxides; automotive three-way catalysts (TWCs); performance

Cite this article

YU Yao , LIN Tao , ZHANG Li-Juan , GUO Jia-Xiu , GONG Mao-Chu , CHEN Yao-Qiang . Preparation of Titanium-Zirconium Mixed Oxide and its Catalytic Performance of Pt Three-way Catalysts[J]. Journal of Inorganic Materials, 2008 , 23(1) : 71 -76 . DOI: 10.3724/SP.J.1077.2008.00071

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