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Effect of Microstructure of CeO2 Particles on Catalyzing Oxidation of Diesel Particulate Matter |
Song YE, Ping SUN(), Junheng LIU, He HUANG |
School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China |
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Cite this article:
Song YE, Ping SUN, Junheng LIU, He HUANG. Effect of Microstructure of CeO2 Particles on Catalyzing Oxidation of Diesel Particulate Matter. Chinese Journal of Materials Research, 2017, 31(12): 955-960.
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Abstract Three type of CeO2 particles was produced by precipitation method. Then the microstructure and oxygen species of CeO2 particles were characterized by means of XRD, nitrogen adsorption, SEM and H2-TPR. While their catalytic activity was evaluated by thermogravimetric analysis(TGA). Results show that the subgrain dimensions of the prepared three types of CeO2 are 8 nm, 11 nm and 20 nm and the corresponding BET surface areas are 89m2/g, 68m2/g and 63m2/grespectively. The pore volumes and diameters of CeO2 particles consistently changed with BET surface areas. In comparison with the plain diesel particulate matter (PM), the ones with addition of CeO2 particles could exhibited higher activity for the oxidation of transitional soot precursor within PM, correspondingly the temperature related with the initial mass-loss of dry soot decreased by 152℃、137℃ and 121℃ and the temperature of the mass-loss peak decreased by 187℃、110℃ and 103℃ respectively, meanwhile the peak mass-loss rate increased. The microstructure of CeO2 particles played a significant role in the formation of oxygen lattice vacancy. In general, CeO2 particles has smaller subgrain size and larger BET surface areas, thus will exhibited better catalytic activity for the oxidation of PM.
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Received: 15 August 2016
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Fund: Supported by Natural Science Foundation of Jiangsu Province (No. BK20160538), Natural Science Research Project of Jiangsu Province (No. 14KJA470001) |
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