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采用阴离子型表面活性剂SDS(十二烷基硫酸钠)和非离子型表面活性剂OP(聚乙二醇辛基苯基醚)做为共模板剂,采用柠檬酸络合-有机模板剂分解耦合法成功制备了介孔TiO2-Al2O3载体及其负载型NSR催化剂。BET测试结果表明:采用共模板剂法制备的TiO2-Al2O3载体比表面积高达398 m2/g,而使用单一模板剂CTAB或传统共沉淀法制备的载体其比表面积分别只有373和250 m2/g。H2-Chemisorption、XRD和NH3-TPD等表征结果显示,该载体同时具有更高的Pt分散度和表面酸量。负载后,所得Pt/K/TiO2-Al2O3催化剂表现出更高的NOx储存量(比传统共沉淀法样品提高62.1%)和抗硫性能(硫化再生效率达到91%)。
Using anionic surfactant SDS (sodium dodecyl sulfate) and non-ionic surfactant OP (polyethylene glycol octylphenyl ether) as a common-mode plate, the use of citric acid complex - organic template The mesoporous TiO2-Al2O3 carrier and its supported NSR catalyst were successfully prepared by decoupling method. The results of BET test show that the specific surface area of TiO2-Al2O3 carrier prepared by the co-templating method is as high as 398 m2 / g, while the carrier prepared by single template CTAB or conventional coprecipitation method has a specific surface area of only 373 and 250 m2 / g, respectively. The characterization results of H2-Chemisorption, XRD and NH3-TPD show that the carrier has higher Pt dispersion and surface acidity at the same time. After loading, the resulting Pt / K / TiO2-Al2O3 catalyst showed higher NOx storage (62.1% higher than the traditional coprecipitation method) and sulfur resistance (sulfurization regeneration efficiency of 91%).