Heterogeneous Chemistry of Acetone and Methanol in Liquid Sulfuric Acid
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heterogeneous chemistry acetone methanol↗
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Uptake of Methanol Vapor in Sulfuric Acid Solutions
Laboratory studies were performed with a flow-tube reactor coupled to an electron-impact ionization mass spectrometer for detection of trace gases.
Methanol Sulfuric Acid Uptake↗
The Heterogeneous Chemistry of Acetone in Sulfuric Acid Solutions: Implications for the Upper Troposphere
The uptake of acetone vapor by liquid sulfuric acid has been investigated over the range of 40-87 wt. %H(sub 2)SO(sub 4) and between the temperatures 198 to 300K.
Heterogenous Chemistry Acetone Sulfuric Acid↗
Kinetics of the Heterogeneous Reaction CO + O = CO(sub 2) on Inorganic Oxide and Water Ice Surfaces: Implications for the Martian Atmosphere
The heterogeneous reaction CO + O - CO(sub 2) on water ice and varios inorganic oxide surfaces has been investigated in order to evaluate the proposition that this heterogeneous reaction may contribute to the CO(sub 2) stability in the Martian atmosphere.
heterogeneous reaction inorganic oxide martian atm↗
Stratospheric Ozone: Past, Present, and Future
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Ozone DNA ozone hole↗
Surface Areas and Morphology of Thin Ice Films
Thin ice films formed by deposition from the vapor phase in a fast flow-tube reactor have been used to simulate polar stratospheric cloud surfaces in order to obtain laboratory data on uptake and heterogeneous reaction rates. Surface areas are determined from BET (Brunauer, Emmett, and Teller) analysis of gas adsorption isotherms. The results for ices prepared at 196 K or 77 K are consistent with previous data on thicker ice films. Environmental scanning electron microscopy is used to obtain particle sizes and shapes, and to investigate the morphology of the ices on borosilicate or silicon windows. In addition, the uptake of HCI on ice films prepared at 196 K is investigated. The results suggest that the layer model we have previously developed for analysis of uptake and heterogeneous reaction rates on ice films is valid. Detailed information will be presented at the conference.
ice films↗
Heterogeneous Chemistry Important in Stratospheric Ozone Depletion
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El Chichon Mt. Pinatubo Hydrolysis stratospheric c↗
Surface Areas and Morphology of Thin Ice Films
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thin ice films vapor phase flow-tube reactor polar↗
Kinetics of the Heterogeneous Reaction HNO3(g) + NaBr(s)<->HBr(g) +NaNO3(s)
The kinetics of the heterogeneous reaction HNO3(g) + NaBr(s)<->HBr(g)+NaNO3(s)has been investigated at 296K using a fast-flow reactor coupled to an electron-impact ionization mass spectrometer.
Heterogeneous Reactions HNO2 salts↗
Morphology and Surface Areas of Thin Ice Films
Thin ice films formed by deposition from the vapor phase in a fast flow-tube reactor have been used to simulate polar stratospheric cloud surfaces in order to obtain laboratory data on uptake and heterogeneous reaction rates.
ice ozone depletion ice films polar stratopsheric ↗
Heterogeneous Interaction of Peroxyacetyl Nitrate on Liquid Sulfuric Acid
The uptake of peroxyacetyl nitrate (PAN) on liquid sulfuric acid surfaces has been investigated using a fast-flow reactor coupled to a chemical ionization mass spectrometer. PAN was observed to be reversibly adsorbed on sulfuric acid.
PAN sulfuric acid peroxyacetyl nitrate↗
Hydrolysis of N2O5 and CLONO2 on the H2SO4/HNO3/H2O Ternary
The reaction probabilities of N2O5 and ClONO2 with H2O on.
stratosphere oxides of nitrogen NOX nitric acid su↗
Experimental Techniques in Gas-Surface Interaction
In this talk I will present several experimental techniques currently used to investigate gas-surface interaction related to acid rain, photochemical smog, and polar ozone depletion.
experimental techniques gas-surface interaction ac↗
Heterogeneous Chemistry Important in the Polar Stratosphere
Aircraft emissions have been thought to enhance the formation of polar stratospheric clouds in the Arctic winter, and therefore heterogeneous reactions on the surfaces of these clouds may accelerate the polar ozone depletion.
polar stratosphere heterogeneous chemistry ozone d↗
Investigation of Heterogeneous Reactions of C1ONO(sub 2), HC1, and HOC1 on Liquid Sulfuric Acid Surfaces
The heterogeneous reactions on liquid sulfuric acid surfaces have been studied using a fast flow-reactor coupled to a quadrupole mass spectrometer.
liquid sulfuric acid surfaces fast flow-reactor qu↗
The Effect of Incorporation of HNO(sub 3) Into Liquid Sulfuric Acid on Heterogeneous Reaction Probabilities
Using a fast-flow reactor coupled to a quadrupole mass spectrometer, the heterogeneous reactions of C1ONO2 + HCl and HOCl + HCl as well as hydrolysis of N2O5 and C1ONO2 were investigated on liquid sulfuric acid, with particular emphasis on the effect of incorporation of HNO3 on the reaction probabilities.
aerosols↗
Heterogeneous Reactions of NaC1(s) with HNO(sub 3)(g), N(sub 2)O(sub 5)(g), and C1ONO(sub 2)(g) over a Temperature Range 223-296 K
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stratospheric chemistry↗
Laboratory Studies of Atmospheric Heterogeneous Chemistry
In the laboratory, ice films formed by freezing from the liquid or more frequently by deposition from the vapor phase have been used to simulate stratospheric cloud surfaces for measurements of reaction and uptake rates. To obtain intrinsic surface reaction probabilities that can be used in atmospheric models, the area of the film surface that actually takes part in the reaction must be known. It is important to know not only the total surface area but also the film morphology in order to determine where and how the surface is situated and, thus, what fraction of it is available for reaction. Information on the structure of these ice films has been obtained by using several experimental methods. In the sections that follow, these methods will be discussed, then the results will be used to construct a working model of the ice films, and finally the model will be applied to an experimental study of HC1 uptake by H_2O ice.
Keyser, L. F.↗