Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-11-01

Journal: CHEMICAL ENGINEERING & TECHNOLOGY

Included Journals: EI、SCIE、Scopus

Volume: 34

Issue: 11

Page Number: 1864-1868

ISSN: 0930-7516

Key Words: Soot oxidation; Nitric oxide; Potassium; Hydrotalcite; Ketene group; Nitrite

Abstract: 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 degrees 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.