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Kinetics and mechanism of the oxidation of carbon by NO 2 in the presence of water vapor
Author(s) -
Jeguirim M.,
Tschamber V.,
Brilhac J. F.
Publication year - 2009
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20395
Subject(s) - chemistry , kinetics , water vapor , carbon fibers , catalysis , activation energy , reaction mechanism , inorganic chemistry , kinetic energy , chemical engineering , photochemistry , organic chemistry , physics , materials science , quantum mechanics , composite number , composite material , engineering
The kinetics and mechanism of the oxidation of carbon by NO 2 in absence and presence of water vapor were studied in a fixed bed reactor. The rate of carbon oxidation by NO 2 is enhanced in the presence of water vapor in the range of temperature 300–400°C. The benefit effect of water is attributed to the intermediate formation of traces of nitric and nitrous acids, which enhance the rate of the carbon oxidation without modifying the global mechanism reaction. Therefore, water acts as a catalyst for the carbon oxidation by NO 2 . A kinetic mechanism derived from this parametric study shows a decrease in the activation energy of carbon oxidation by NO 2 in the presence of water vapor. This result is in agreement with the experimental observation. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 41: 236–244, 2009