期刊
APPLIED SURFACE SCIENCE
卷 462, 期 -, 页码 678-684出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.08.186
关键词
Soot oxidation; NO adsorption/desorption; MnOx-CeO2; Active oxygen species
类别
资金
- Science and Technology Development Project of Sichuan Province in China [2015GZ0054]
The role of NO adsorption/desorption on soot oxidation activity of MnOx-CeO2 mixed oxides was investigated in this work. NO adsorption/desorption on MnOx-CeO2 results in a visible promotion of the low-temperature reactivity. Physico-chemical characterization reveals that the formation of NO adsorbed species, mainly nitrates, leads to changes in the surface Ce/Mn states and in an increase of oxygen vacancies. Moreover, TPD-MS indicates that the decomposition of surface nitrates accelerates the desorption of oxygen in the catalyst. Soot-TPR-MS confirms that the oxygen species desorbed from nitrates decomposition play an important role during soot oxidation. The isothermal experiments evidence that NO adsorption/desorption enhances soot oxidation rate, with active oxygen playing a key role in a cooperative C + NO2 + O-2 reaction with the catalyst.
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