具有低SO_2氧化活性的Pt/Zr_xTi_(1-x)O_2柴油车氧化催化剂的制备及性能  

Preparation and Properties of Pt/Zr_xTi_(1-x)O_2 Catalysts with Low-Level SO_2 Oxidation Activity for Diesel Oxidation

作　　者：杨铮铮[1] 陈永东[1,2] 赵明[1] 周菊发[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,四川成都610064 [2]西南石油大学新能源研究中心,四川成都610500

出　　处：《催化学报》2012年第5期819-826,共8页

基　　金：国家自然科学基金(21173153);绿色催化四川省高校重点实验室开放课题基金(LYY1101)~~

摘　　要：采用共沉淀法制备了一系列ZrxTi1-xO2(x=0.0,0.1,0.5,0.9,1.0)复合氧化物,并以此为载体,用等孔体积浸渍H2PtCl6制得Pt/ZrxTi1-xO2柴油车氧化催化剂.运用N2吸附-脱附,X射线多晶粉末衍射,X射线光电子能谱,H2程序升温还原和NH3程序升温脱附等手段对催化剂进行了表征.结果表明,在系列催化剂样品中,Zr0.1Ti0.9O2复合氧化物主要以锐钛矿形式存在,具有较好的织构性能,样品的比表面积达94m2/g,孔体积为0.33cm3/g.相应地,Pt/Zr0.1Ti0.9O2催化剂表现出优异的催化氧化性能,HC和CO的起燃温度(T50)分别为185和174oC,完全转化温度(T90)分别为197和201oC;且具有较低的SO2氧化活性,350oC时SO2仅转化25.5%.A series of ZrxTi1-xO2（x = 0,0.1,0.5,0.9,1.0） mixed oxides were prepared by the co-precipitation method and were used as supports to prepare Pt/ZrxTi1-xO2 catalysts by impregnation with H2PtCl6 solution.The catalysts were characterized by N2 adsorption,X-ray diffraction-desorption,X-ray photoelectron spectroscopy,H2 temperature-programmed reduction,and NH3 temperature-programmed desorption.The results indicated that the dominative crystalline phase of Zr0.1Ti0.9O2 is anatase and it has higher specific surface area（94 m2/g） and larger pore volume（0.33 cm3/g）.Compared with the Pt/ZrxTi1-xO2（x = 0,0.5,0.9,1.0） catalysts,Pt/Zr0.1Ti0.9O2 shows excellent catalytic activity（T50 of HC and CO are 185 and 174 oC,respectively,and T90 of HC and CO are 197 and 201 oC,respectively） and low-level oxidation activity of SO2（the SO2 conversion at 350 oC is only 25.5%）.

关 键 词：锆 钛 复合氧化物 共沉淀 铂 负载型催化剂 浸渍法 

分 类 号：TE624.1[石油与天然气工程—油气加工工程]