Effect of Microstructure of CeO2 Particles on Catalyzing Oxidation of Diesel Particulate Matter

doi:10.11901/1005.3093.2016.483

Chinese Journal of Materials Research

2017, Vol. 31

Issue (12): 955-960 DOI: 10.11901/1005.3093.2016.483

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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

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 CeO₂particles 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 CeO₂particles 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 CeO₂particles played a significant role in the formation of oxygen lattice vacancy. In general, CeO₂particles has smaller subgrain size and larger BET surface areas, thus will exhibited better catalytic activity for the oxidation of PM.

Key words: inorganic non-metallic materials micro-structure catalyzing oxidation thermogravimetric analysis CeO₂ particulate matter

Received: 15 August 2016

ZTFLH:	TB321
	TK421

Fund: Supported by Natural Science Foundation of Jiangsu Province (No. BK20160538), Natural Science Research Project of Jiangsu Province (No. 14KJA470001)

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	Song YE
	Ping SUN
	Junheng LIU
	He HUANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.483 OR https://www.cjmr.org/EN/Y2017/V31/I12/955

Fig.1 XRD cruve of CeO₂ sample

Fig.2 SEM comparison graphs of CeO₂ sample

Table 1 BET surface areas、pore volumes and diameters of CeO₂ sample

Fig.3 H₂-TPR curve of CeO₂sample

Table 2 Mass loss characteristic parameters of diesel particulate matter

Fig.4 TG and DTG curve of different micro-structure CeO₂mixed with particulate matter

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