IR-study of formation of nitrite and nitrate during NOx-adsorption on NSR-catalysts-compounds CeO2 and BaO/CeO2

被引：50
作者：
Symalla, M. O.
Drochner, A.
Vogel, H.
Philipp, S.
Gobel, U.
Muller, W.
机构：
[1] Tech Univ Darmstadt, Ernst Berl Inst Tech & Makromol Chem, D-64287 Darmstadt, Germany
[2] Umicore AG & Co KG, D-63403 Hanau, Germany
来源：
TOPICS IN CATALYSIS | 2007年 / 42-43卷 / 1-4期
关键词：
ceria; barium oxide; lean NOx trap; DRIFTS; IR; storage mechanism; NSC; NSR; nitrite; nitrate;
D O I：
10.1007/s11244-007-0178-y
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The storage of NO, NO/O-2-mixtures and NO2 on CeO2 and BaO/CeO2 was investigated by in situ DRIFT-spectroscopy. The NOx-storage capacity, as well as the kinetic and the mechanism of the NOx-storage process are influenced by the temperature and the BaO-loading as well as the oxygen partial pressure. The addition of oxygen into NO containing gas mixtures results in the oxidation of the stored nitrite to nitrate species. Adsorption of NO2 leads to in the formation of nitrite and nitrate species, where the nitrite species are completely oxidized to nitrate in the progress of storage.
引用
收藏
页码：199 / 202
页数：4
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