The heterogeneous loss of ozone on n-hexane soot surfaces has been studied in a coated-wall flow tube connected to a mass spectrometer for gas-phase analysis. Uptake measurements confirm earlier studies that the initial uptake is primarily noncatalytic and that the number of reactive surface sites is close to that of a full monolayer. The initial uptake kinetics exhibit an inverse dependence on ozone gas-phase concentration, as expected in the surface-saturated limit if the reaction proceeds via a Langmuir-Hinshel wood mechanism. Support for this reaction's not being an Eley-Rideal process comes from the lack of temperature dependence of the initial uptake coefficient from 260 to 360 K and that a saturated surface coverage of adsorbed dodecane does not affect the kinetics. It is demonstrated that there is a strong similarity between the initial uptake kinetics for ozone loss on a wide variety of surfaces, including soot; 1-hexadecene (as studied in this work); metal oxides, including atmospheric mineral dust; and PAHs adsorbed on a variety of surfaces. This suggests that the ozone loss may proceed through a common reaction pathway on such surfaces.
%0 Journal Article
%1 McCabe:2009p3191
%A McCabe, J
%A Abbatt, J. P. D
%D 2009
%J Journal of Physical Chemistry C
%K Adsorption, Aerosol-Particles, Aerosols, Decomposition, Ice O-3, Partial-Pressure, Reactive Salt Surfaces Temperature, Thermodynamics, Uptake,
%N 6
%P 2120--2127
%R 10.1021/jp806771q
%T Heterogeneous Loss of Gas-Phase Ozone on n-Hexane Soot Surfaces: Similar Kinetics to Loss on Other Chemically Unsaturated Solid Surfaces
%U http://pubs.acs.org/doi/abs/10.1021/jp806771q
%V 113
%X The heterogeneous loss of ozone on n-hexane soot surfaces has been studied in a coated-wall flow tube connected to a mass spectrometer for gas-phase analysis. Uptake measurements confirm earlier studies that the initial uptake is primarily noncatalytic and that the number of reactive surface sites is close to that of a full monolayer. The initial uptake kinetics exhibit an inverse dependence on ozone gas-phase concentration, as expected in the surface-saturated limit if the reaction proceeds via a Langmuir-Hinshel wood mechanism. Support for this reaction's not being an Eley-Rideal process comes from the lack of temperature dependence of the initial uptake coefficient from 260 to 360 K and that a saturated surface coverage of adsorbed dodecane does not affect the kinetics. It is demonstrated that there is a strong similarity between the initial uptake kinetics for ozone loss on a wide variety of surfaces, including soot; 1-hexadecene (as studied in this work); metal oxides, including atmospheric mineral dust; and PAHs adsorbed on a variety of surfaces. This suggests that the ozone loss may proceed through a common reaction pathway on such surfaces.
@article{McCabe:2009p3191,
abstract = {The heterogeneous loss of ozone on n-hexane soot surfaces has been studied in a coated-wall flow tube connected to a mass spectrometer for gas-phase analysis. Uptake measurements confirm earlier studies that the initial uptake is primarily noncatalytic and that the number of reactive surface sites is close to that of a full monolayer. The initial uptake kinetics exhibit an inverse dependence on ozone gas-phase concentration, as expected in the surface-saturated limit if the reaction proceeds via a Langmuir-Hinshel wood mechanism. Support for this reaction's not being an Eley-Rideal process comes from the lack of temperature dependence of the initial uptake coefficient from 260 to 360 K and that a saturated surface coverage of adsorbed dodecane does not affect the kinetics. It is demonstrated that there is a strong similarity between the initial uptake kinetics for ozone loss on a wide variety of surfaces, including soot; 1-hexadecene (as studied in this work); metal oxides, including atmospheric mineral dust; and PAHs adsorbed on a variety of surfaces. This suggests that the ozone loss may proceed through a common reaction pathway on such surfaces.},
added-at = {2010-06-22T19:38:37.000+0200},
affiliation = {Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada},
author = {McCabe, J and Abbatt, J. P. D},
biburl = {https://www.bibsonomy.org/bibtex/2305da3a2559020775afd4300b3c91e7e/gsmith},
date-added = {2010-04-29 08:40:18 -0400},
date-modified = {2010-04-29 08:45:04 -0400},
doi = {10.1021/jp806771q},
interhash = {a6895448c3c9bbf8925278f76deb6de9},
intrahash = {305da3a2559020775afd4300b3c91e7e},
journal = {Journal of Physical Chemistry C},
keywords = {Adsorption, Aerosol-Particles, Aerosols, Decomposition, Ice O-3, Partial-Pressure, Reactive Salt Surfaces Temperature, Thermodynamics, Uptake,},
language = {English},
local-url = {file://localhost/Users/geoffreysmith/Documents/Papers/Journal%20of%20Physical%20Chemistry%20C/2009/Journal%20of%20Physical%20Chemistry%20C,%20113,%202120-2127%202009.pdf},
month = Jan,
number = 6,
pages = {2120--2127},
pmid = {000263134700013},
rating = {0},
timestamp = {2010-06-22T19:39:33.000+0200},
title = {Heterogeneous Loss of Gas-Phase Ozone on n-Hexane Soot Surfaces: Similar Kinetics to Loss on Other Chemically Unsaturated Solid Surfaces},
uri = {papers://E88B624E-D406-46FF-9D95-BB9C1AAE3FDC/Paper/p3191},
url = {http://pubs.acs.org/doi/abs/10.1021/jp806771q},
volume = 113,
year = 2009
}