Zr_xTi_xAl_(1-2x)O_2的制备及其在三效催化剂上的应用  

Zr_xTi_xAl_(1-2x)O_2 Mixed Oxide:Preparation and Application in Three-way Catalysts

作　　者：喻瑶[1] 龚茂初[1] 郭家秀[1] 林涛[1] 袁书华[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,成都610064

出　　处：《无机化学学报》2007年第8期1453-1456,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20333030)资助项目。

摘　　要：Zr0.5Ti0.5O2(ZT) and Zr0.25Ti0.25Al0.5O2(ZTA) mixed oxides were prepared by co-precipitation method and characterized by low temperature adsorption-desorption,XRD and NH3-TPD. The activity of Pt/Zr0.5Ti0.5O2 and Pt/ Zr0.5Ti0.5Al0.5O2 catalysts was evaluated using the simulated gases. The results show that ZTA samples exhibit higher specific surface area,larger pore volume and proper surface acidic amount and acidity in comparison with ZT. The results of the catalytic test indicate that Pt/ZT and Pt/ZTA catalysts exhibit excellent low-temperature catalytic activity and lower light-off temperatures of hydrocarbon,carbon monoxide and nitrogen oxides,especially better conversion for nitrogen oxides (NOx). The addition of Al2O3 into ZT enhanced the anti-aging property of Pt/ ZTA catalysts due to the excellent textural,structural,surface acidity and thermal stability.Zr0.5Ti0.5O2（ZT） and Zr0.25Ti0.25Al0.5O2（ZTA） mixed oxides were prepared by co-precipitation method and characterized by low temperature adsorption-desorption,XRD and NH3-TPD. The activity of Pt/Zr0.5Ti0.5O2 and Pt/ Zr0.5Ti0.5Al0.5O2 catalysts was evaluated using the simulated gases. The results show that ZTA samples exhibit higher specific surface area,larger pore volume and proper surface acidic amount and acidity in comparison with ZT. The results of the catalytic test indicate that Pt/ZT and Pt/ZTA catalysts exhibit excellent low-temperature catalytic activity and lower light-off temperatures of hydrocarbon,carbon monoxide and nitrogen oxides,especially better conversion for nitrogen oxides （NOx）. The addition of Al2O3 into ZT enhanced the anti-aging property of Pt/ ZTA catalysts due to the excellent textural,structural,surface acidity and thermal stability.

关 键 词：XRD TPD Zr0.25Ti0.25Al0.5O2氧化物 PT 三效催化剂(TWC) 

分 类 号：O643[理学—物理化学]