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Journal Article

The oxidation of soot particulate in the presence of NO2

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21519

Frank,  Benjamin
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22148

Su,  Dang Sheng
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Shenyang National Laboratory for Materials Science Institute of Metal Research, Chinese Academy of Science;

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Citation

Müller, J.-O., Frank, B., Jentoft, R. E., Schlögl, R., & Su, D. S. (2012). The oxidation of soot particulate in the presence of NO2. Catalysis today, 191(1), 106-111. doi:10.1016/j.cattod.2012.03.010.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-9C95-A
Abstract
The microstructure of soot-like carbons is correlated with their reactivity toward combustion. The focus of this study is on Euro IV heavy duty diesel engine soot. Additionally, two soot samples providing lower and larger particle sizes as their most striking property are taken as references. The effect of NO2 addition to the O2-containing gas feed is investigated. It is found that NO2 accelerates the oxidation of soot in the low-temperature region (250–400 °C) due to an increased surface functionalization with oxygen groups and a subsequent decomposition thereof. Accordingly, initially highly functionalized soot is less susceptible to this effect. The apparent activation energy of combustion is remarkably lowered in the presence of NO2. It is found that the total reactivity correlates with microstructural features such as surface functionalization, size and curvature of basic structural units, stack height, and particle diameter.