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Determination of Mechanism for Soot Oxidation with NO on Potassium Supported Mg‐Al Hydrotalcite Mixed Oxides
Author(s) -
Zhang Y.,
Su Q.,
Li Q.,
Wang Z.,
Gao X.,
Zhang Z.
Publication year - 2011
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201100291
Subject(s) - hydrotalcite , chemistry , ketene , soot , oxygen , inorganic chemistry , potassium , oxygenate , nitrite , reaction mechanism , deoxygenation , combustion , catalysis , organic chemistry , nitrate
Soot oxidation with NO (in the absence of gas phase O 2 ) on potassium‐supported Mg‐Al hydrotalcite mixed oxides (K/MgAlO) was studied using a temperature‐programmed reaction and in situ FTIR techniques. Nitrite and the ketene group were identified as the reaction intermediates and thus a nitrite‐ketene mechanism was proposed in which surface active oxygen on K sites of K/MgAlO is transferred to soot by NO through nitrites. In the absence of gas phase O 2 , soot oxidation with NO at lower temperatures (below 450 °C) is limited by the amount of active oxygen on the K sites. This kind of active oxygen is not reusable but can be replenished in the presence of gas phase O 2 .