Pt/MoO3/ZrO2催化剂的制备及三效催化性能的研究  

Preparation of Pt/MoO3_/ZrO_2 Catalyst and its Property of Three-Way Catalysts

作　　者：温怡芸[1] 刘志敏[1] 蔡黎[1] 郭家秀[1] 龚茂初[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,绿色化学与技术教育部重点实验室,成都610064

出　　处：《无机材料学报》2008年第6期1267-1271,共5页Journal of Inorganic Materials

基　　金：国家自然科学重点基金(20333030);国家“863”项目(2006AA06z347)

摘　　要：采用浸渍法制备了MoO_3/ZrO_2,用低温氮吸附-脱附法和NH_3-程序升温脱附法(TPD)分别对其比表面积和酸碱性进行了表征.结果表明,MoO_3/ZrO_2具有106.8m^2/g的比表面积和超强酸的性能.用等体积浸渍法制备了Pt/MoO_3/ZrO_2催化剂,在汽车尾气模拟气中考察了其对C_3H_8、CO和NO的催化活性.与传统三效催化剂Pt/La_2O_3/Al_2O_3相比较,Pt/MoO_3/ZrO_2具有更好的低温起燃性能和更宽的空燃比窗口,并显著地改善了C_3H_8在富氧状态下的转化效率.通过XRD、H_2-TPR对催化剂进行了表征,结果表明,Pt在催化剂载体上具有高度的分散性和优异的氧化还原性能.MoO3/ZrO2 was prepared by impregnation method.Its specific surface area,pore size, pore volume and surface acidity were investigated by means of low temperature nitrogen adsorption- desorption and NH3-temperature programmed desorption.By using MoO3/ZrO2 and La2O3/Al2O3 as catalyst support,Pt/MoO3/ZrO2 and Pt/La2O3/Al2O3 catalysts were prepared by wet impregnation method and the activity test of C3H8,CO,NO were also investigated in the simulated automotive gas. The results show that MoO3/ZrO2 has good texture（S（BET）=106.8m2/g）and surface super-acidity.And the catalysts were also characterized by X-ray diffraction and H2-temperature programmed reduction. Compared with traditional three-way catalyst Pt/La2O3/Al2O3,Pt/MoO3/ZrO2 exhibits lower light-off temperature of hydrocarbon（230℃）,carbon monoxide（200℃）,and nitrogen oxides（210℃）and wider operational air-to-fuel ratio window,which especially improves C3H8 conversion under higher oxidative conditions.The results also show that Pt on the catalyst support has high dispersion and excellent redox properties.

关 键 词：MoO3/ZrO2 Pt/MoO3/ZrO2催化剂 空燃比特性 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]