The titania washcoats on cordierite monolith deNOx catalyst were prepared by dipping cordierite ceramic honeycomb in titania slurry using alumina sol as binder.The influence of different additives on titania coating and pH on viscosity of titania slurry was investigated.The TiO2 washcoats were characterized by microscopic analysis of ultrasonic surging,BET,SEM and XRD.It is showed that the pH of the titania slurry can affect the viscosity of slurry with the perfect viscosity at pH 1.780 of the titania slurry.Either urea or methenamine can improve the properties of titiania washcoats.The maximum loading,high adhesive capacity of the coatings and specific surface area can be obtained when 3 ％ urea or 0.1％ methenamine is added.%以铝溶胶为黏结剂,采用浆液浸涂法对堇青石蜂窝陶瓷基体进行涂覆,制备整体式脱硝催化剂的TiO2涂层.考察了pH值对TiO2浆液黏度的影响,以及不同添加剂对TiO2浆液涂覆效果的影响,并结合超声振荡、BET、扫描电镜和X射线衍射等分析测试手段对TiO2涂层进行表征.实验结果表明:TiO2浆液黏度随pH值的增加呈先降后升的趋势,当pH值为1.780时,TiO2浆液的黏度最低；TiO2涂层可使涂层堇青石蜂窝陶瓷载体的比表面积明显增加；添加尿素或六次甲基四胺均可提高TiO2涂层在堇青石蜂窝陶瓷基体上的负载量和牢固度,其中添加质量分数3％的尿素或质量分数0.1％的六次甲基四胺时涂层负载量和牢固度较高.
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