Catalytic Combustion of Diesel Soot on Co-Sr-K Catalysts
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- 作者：Lina Sui ; Liyan Yu ; Yongheng Zhang
- 刊名：Energy & Fuels
- 出版年：2007
- 出版时间：May 2007
- 年：2007
- 卷：21
- 期：3
- 页码：1420 - 1424
- 全文大小：111K
- 年卷期：v.21,no.3(May 2007)
- ISSN：1520-5029
文摘
The catalytic activities of Co<SUB>3O4, Sr(NO3)2, Co-Sr, and Co-Sr-K catalysts were studied, and theeffect of the contact mode on the soot onset ignition temperature and soot oxidation rate was also discussed.All the catalysts were characterized by X-ray diffraction and thermogravimetry/differential scanning calorimetry.The catalytic activities were evaluated by a soot oxidation reaction using the temperature-programmedreaction system. The soot onset ignition temperature is 370 
C for Co-Sr catalysts with molar ratios of1:1 and 2:1, which is the same as that of pure Co3O4. The Co-Sr catalysts containing KNO3 can greatlylower the soot onset ignition temperature. The catalytic activity of pure Co3O4 and Sr(NO3)2 is affectedby catalysts-soot contact intensity, which has nearly no effect on the soot onset ignition temperatureand soot oxidation rate for Co-Sr catalysts with appropriate ratios. The cooperation of Co3O4 andSr(NO3)2 can accelerate the soot oxidation rate and reduce the effect of the soot-catalyst contact mode oncatalytic activity. The soot onset ignition temperature is not affected by contact intensity for the catalystswith proper Co-Sr-K ratios, which shows that the cooperation of Co3O4, Sr(NO3)2, and KNO3 can lowerthe soot onset ignition temperature whether in the tight contact mode or in the loose contact mode.The soot oxidation rate is greatly accelerated when the Co-Sr-K catalysts and soot are in the tight contactmode.
C for Co-Sr catalysts with molar ratios of1:1 and 2:1, which is the same as that of pure Co3O4. The Co-Sr catalysts containing KNO3 can greatlylower the soot onset ignition temperature. The catalytic activity of pure Co3O4 and Sr(NO3)2 is affectedby catalysts-soot contact intensity, which has nearly no effect on the soot onset ignition temperatureand soot oxidation rate for Co-Sr catalysts with appropriate ratios. The cooperation of Co3O4 andSr(NO3)2 can accelerate the soot oxidation rate and reduce the effect of the soot-catalyst contact mode oncatalytic activity. The soot onset ignition temperature is not affected by contact intensity for the catalystswith proper Co-Sr-K ratios, which shows that the cooperation of Co3O4, Sr(NO3)2, and KNO3 can lowerthe soot onset ignition temperature whether in the tight contact mode or in the loose contact mode.The soot oxidation rate is greatly accelerated when the Co-Sr-K catalysts and soot are in the tight contactmode.