| Abstract 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 specific 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. |
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2013, Vol. 30 
