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Hongcheng Li,Kongzhai Li,Xing Zhu,Yunpeng Du,Yonggang Wei,Kang Zhai,Hua Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
The fabrication of mesoporous PrxZr1xO2d solid solutions with different Pr/Zr molar ratios is reported in the present work. Based on a systematic investigation, the anion of Zr precursor and template species are found to play the most important roles for the formation of mesoporous structure. The triblock copolymer Pluronic F127 template helps to generate porosity in the matrix by self-assembly into micelle, while the additional Cl1 from Zr precursor can lead to the enhancement of the interaction between non-ionic micelles. The physicochemical properties of the obtained samples were studied by means of N2 sorption analysis, TEM, XRD, H2-TPR, O2-TPD and XPS technique. It is found that, compared with the nonmesoporous counterparts, the mesoporous PrxZr1xO2d solid solutions possess much higher specific surface area (139 m2 g1) and enhanced redox ability. Also, the ability to release oxygen is improved after aging at high temperature. For the catalytic soot oxidation, the fresh mesoporous Pr0.1Zr0.9O2d catalyst (calcinated at 500 C) shows high activity in a loose contact condition (T50 = 399 C). It should be highlighted that the T50 values over the three mesoporous PrxZr1xO2d samples decrease by 8–24 C after aging at 800 C for 3 h. This suggests that the mesoporous PrxZr1xO2d solid solution is an ideal candidate for catalytic application at high temperatures.