摘要
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%)。
The mesoporous binary oxide supports TiO2-Al2O3 were prepared by combining citric acid complexation-organic template decomposition method,using the mixture of anionic sodium dodecyl sulfate（SDS） and nonionic p-octyl polyethylene glycol phenyl ether（OP） as co-templates,and the corresponding NOx storage and reduction（NSR） catalysts Pt/K/TiO2-Al2O3 were prepared by using successive impregnation.The results of BET measurement show that the support prepared by using co-templates possesses much larger specic surface area（398 m2/g） than those prepared by using single template SDS（373 m2/g） or by using conventional co-precipitation method（250 m2/g）.The results of H2-chemisorption,XRD and NH3-TPD indicate that in the corresponding sample the metal Pt and the TiO2 crystallites possess the highest dispersion,and the support has the largest amount of acidity.The results of NOx storage capacity measurement show that the catalyst with the support prepared by co-templates exhibits much higher NOx storage capacity（62.1% higher than that of the sample prepared by co-precipitation method） and recovery efficiency（as high as 91%） than other samples.
出处
《化学工业与工程》
CAS
2013年第4期23-28,共6页
Chemical Industry and Engineering
关键词
PT
K
TiO2-Al2O3
OP
SDS
介孔
NOx储存
抗硫
Pt/K/TiO2-Al2O3
P-octyl polyethylene glycol phenyl ether
sodium dodecyl sulfate
mesoporous
NOx storage
sulfur-resistance
