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The Effect of Oxygen Concentration on the Reaction of NO x with Soot Over BaAl 2 O 4
Author(s) -
Li Y. J.,
Lin H.,
Shangguan W. F.,
Huang Z.
Publication year - 2008
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.200700313
Subject(s) - soot , nox , chemistry , oxygen , catalysis , analytical chemistry (journal) , diffuse reflectance infrared fourier transform , limiting oxygen concentration , fourier transform infrared spectroscopy , nitrate , infrared spectroscopy , inorganic chemistry , combustion , chemical engineering , organic chemistry , photocatalysis , engineering
Abstract The effect of oxygen concentration on the catalytic reaction of NO x with soot over BaAl 2 O 4 has been studied by Diffuse Reflectance Fourier Transform Infrared Spectroscopy (DRIFTS). The introduction of O 2 into the NO flow can result in a reactant mixture of NO/NO 2 /O 2 . Increasing the O 2 concentration from 2 % to 5 % in the NO‐containing flow promotes the formation of NO 2 from the gas phase oxidation of NO. The reactant mixture with high O 2 /NO flow, allows for the formation of greater amounts of nitrate species than that with low O 2 /NO flow, which further promotes the reaction of soot with NO x and leads to a high conversion efficiency of NO x into N 2 and N 2 O. In the absence of O 2 , N 2 O is not observed since the N 2 O produced at high temperatures has reacted with soot before it can be detected.