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Impact of SO 2 and NO on CO oxidation under post‐flame conditions
Author(s) -
Glarborg Peter,
Kubel Dorte,
DamJohansen Kim,
Chiang HongMing,
Bozzelli Joseph W.
Publication year - 1996
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/(sici)1097-4601(1996)28:10<773::aid-kin8>3.0.co;2-k
Subject(s) - chemistry , environmental chemistry
An experimental and theoretical study on the effect of SO 2 on moist CO oxidation with and without NO present has been carried out. The experiments were performed in an isothermal quartz flow reactor at atmospheric pressure in the temperature range 800–1300 K. Inlet concentrations of SO 2 ranged from 0 to 1800 ppm v , while the NO ranged between 0, 100, or 1500 ppm. SO 2 inhibits CO oxidation under the conditions investigated, shifting the fast oxidation regime 20–40 K towards higher temperatures at 1500 ppm SO 2 . The inhibition is most pronounced at high O atom levels. The experimental data supported by model analysis suggest that SO 2 primarily reacts with O atoms forming SO 3 , which is subsequently consumed mainly by reaction with O and HO 2 . Addition of NO significantly diminishes the effect of SO 2 . Since NO is usually present in combustion flue gases, the impact of SO 2 on CO burnout in most practical systems is projected to be small. The H/S/O thermochemistry and reaction subset has been revised based on recent experimental and theoretical results, and a chemical kinetic model has been established. The model provides a reasonable overall description of the effect of SO 2 and NO on moist CO oxidation, while the SO 3 /SO 2 ratio is well predicted over the range of conditions investigated. In order to enhance model performance further, rate constants for a number of SO 2 and SO 3 reactions need to be determined with higher accuracy. © 1996 John Wiley & Sons, Inc.