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

doi:10.3724/SP.J.1077.2008.00071

Abstract

Abstract:

Zr_0.5 Ti_0.5 O₂ mixed oxides were prepared by co-precipitation method. The effects of pH value, precipitation temperature and calcination temperature of Zr_0.5 Ti_0.5O 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 Zr_0.5Ti_0.5O₂ and La-Al₂O₃ as catalyst carriers, and the activities of Pt/Zr_0.5 Ti_0.5O₂ 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℃, Zr_0.5Ti_0.5O₂ 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/Zr_0.5Ti_0.5O₂ 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/Zr_0.5Ti_0.5O₂ catalysts significantly improve the conversion for nitrogen oxides.

Key words: Zr_0.5Ti_0.5O₂ mixed oxides, automotive three-way catalysts (TWCs), performance

CLC Number:

O643

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, DOI: 10.3724/SP.J.1077.2008.00071.

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