锆钛复合氧化物的制备及用作Pt三效催化剂载体的性能
Preparation of Titanium-Zirconium Mixed Oxide and its Catalytic Performance of Pt Three-way Catalysts
Received date: 2007-03-31
Revised date: 2007-06-22
Online published: 2008-01-20
关键词: Zr0.5Ti0.5O2 复合氧化物; 汽车尾气三效催化剂; 性能
喻 瑶 , 林 涛 , 张丽娟 , 郭家秀 , 龚茂初 , 陈耀强 . 锆钛复合氧化物的制备及用作Pt三效催化剂载体的性能[J]. 无机材料学报, 2008 , 23(1) : 71 -76 . DOI: 10.3724/SP.J.1077.2008.00071
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.
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