Citation: GAO Xiu-hui, WANG Sheng, GAO Dian-nan, LIU Wei-gang, CHEN Zhi-ping, WANG Ming-zhe, WANG Shu-dong. Catalytic combustion of methane over Pd/MWCNTs under lean fuel conditions[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(8): 928-936. shu

Catalytic combustion of methane over Pd/MWCNTs under lean fuel conditions

GAO Xiu-hui ^1,2 ,
WANG Sheng ^1,*,, ,
GAO Dian-nan ¹ ,
LIU Wei-gang ^1,2 ,
CHEN Zhi-ping ^1,2 ,
WANG Ming-zhe ¹ ,
WANG Shu-dong ^1,*,,

1.
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: WANG Sheng, wangsheng@dicp.ac.cn WANG Shu-dong, wangsd@dicp.ac.cn
Received Date: 5 April 2016
Revised Date: 7 June 2016

Figures(11)

The raw multi-walled carbon nanotubes (MWCNTs) were treated with nitric acid. The shift of the surface functional groups on the MWCNTs was observed with XPS. The Pd/MWCNTs catalysts were synthesized by the ultrasonic impregnation method. The total contents of oxygen, hydroxyl and carbonyl groups were measured. The dispersion and size distribution of Pd particles were characterized with TEM. The dependence of Pd dispersion on the oxygen-containing functional groups was validated. The effect of pretreatment on the catalytic activity and stability for methane combustion was investigated under lean fuel conditions. It is shown that the catalytic activity depends on the valence state and particle size of palladium. The transformation from Pd to PdO possibly caused the decrease in the catalytic activity. Another factor inducing deactivation is Pd particle aggregation. The reaction mechanism for methane combustion over the Pd/MWCNTs catalyst is postulated on the basis of the intermediate species detected by in-situ FT-IR spectroscopy.
- MWCNTs,
- methane combustion,
- oxygen-contained functional groups,
- active species,
- reaction mechanism
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