Journal of Industrial and Engineering Chemistry, Vol.54, 126-136, October, 2017
Synthesis of mesoporous PrxZr1-xO2- δ solid solution with high thermal stability for catalytic soot oxidation
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The fabrication of mesoporous PrxZr1-xO2-δ 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 Cl-1 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 PrxZr1-xO2-δ solid solutions possess much higher specific surface area (139 m2 g-1) 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 Pr0.1Zr0.9O2-δ 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 PrxZr1-xO2-δ samples decrease by 8-24 °C after aging at 800 °C for 3 h. This suggests that the mesoporous PrxZr1-xO2-δ solid solution is an ideal candidate for catalytic application at high temperatures.
Keywords:Mesoporous oxides;Pr-Zr-O solid solution;Catalytic soot oxidation;Loose contact;Thermal stability
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