Citation: YANG Li, ZHANG Chen, YUE Tao, ZHANG Fan, SHU Xin-qian, TONG Li. Research on the mechanism of xK/MgAlO hydrotalcite for the catalytic combustion of soot[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(12): 1528-1536. shu

Research on the mechanism of xK/MgAlO hydrotalcite for the catalytic combustion of soot

YANG Li ¹ ,
ZHANG Chen ² ,
YUE Tao ¹ ,
ZHANG Fan ² ,
SHU Xin-qian ^3,, ,
TONG Li ¹

1.
Beijing Municipal Institute of Labour Protection, Beijing 100054, China
2.
Chinese Research Academy of Environmental Science, Beijing 100012, China
3.
School of Chemical & Environmental Engineering, China University of Mining Technology(Beijing), Beijing 100083, China

Corresponding author: SHU Xin-qian, shuxinqian@126.com
Received Date: 6 August 2018
Revised Date: 17 October 2018

Fund Project: the Youth Core Plan of Beijing Academy of Science and Technology YC201806the National Natural Science Foundation of China 51074170the National Key Research and Development Plan of "Causes and Control of Air Pollution" 2016YFC0208103The project was supported by the National Natural Science Foundation of China (51074170), the Youth Core Plan of Beijing Academy of Science and Technology (YC201806) and the National Key Research and Development Plan of "Causes and Control of Air Pollution"(2016YFC0208103)

Figures(6)

The Mg-Al hydrotalcites used as the support were prepared by precipitation method, and then the catalysts with different amount of doped potassium, (xK/MgAlO) were prepared by impregnation method. The effects of K on the structure and catalytic activity of the xK/MgAlO catalyst were investigated in SO₂ containing gases. The key mechanism of K-doped (xK/MgAlO) catalysts to reduce the soot ignition temperature during the reaction was illustrated. The differences of the crystal structure between calcined and uncalcined Mg-Al hydrotalcite were studied by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and the transient response method. The experimental results showed that the 3R layered structure of Mg-Al hydrotalcite disappeared while the spinel phase appeared, and the layered structure collapsed into spherical particles after calcination. Potassium doping formed more oxygen vacancies that are conducive to the combustion of diesel soot, decreased the temperature of soot combustion from 380 to 253℃ though in SO₂ atmosphere and significantly enhanced the conversion efficiency of NO_x.
- Mg-Al hydrotalcite,
- potassium,
- NO_x,
- sulfur dioxide,
- oxygen vacancies
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