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The chemical kinetics of HONO formation resulting from heterogeneous interaction of NO 2 with flame soot
Author(s) -
Gerecke Andreas,
Thielmann Axel,
Gutzwiller Lukas,
Rossi Michel J.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl01796
Subject(s) - soot , acetylene , toluene , ethylene , diffusion , hydrogen , diffusion flame , analytical chemistry (journal) , chemistry , materials science , photochemistry , environmental chemistry , organic chemistry , combustion , thermodynamics , catalysis , combustor , physics
Uptake experiments at ambient temperature of NO 2 on ethylene, acetylene and toluene soot resulted in significant amounts of HONO. The initial uptake coefficient γ0 of NO 2 on ethylene soot decreased from 0.12 to 0.03 with increasing NO 2 concentration in the range 8×10 10 to 1.4×10 13 molecule s −1 . The HONO yields relative to NO 2 taken up were in the range 50 to 93% and were consistent with a mechanism in which either soot or hydrogen contained in it was the reducing agent. The branching ratio of the yield of HONO and NO was a function of the sampling spot at which the soot was collected within a diffusion flame and ranged from 23 to 2.2 with increasing distance from the flame base and thus age. The total amount of HONO generated in one uptake experiment was 1.2×10 16 molecules per mg of soot. Heating cycles bring back the ability of soot to generate HONO, but at diminishing yields.