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Gas Phase Reaction of Sulfur Trioxide With Water Vapor.

ADA289135

Publication Date	1994
Personal Author	Kolb, C. E.; Molina, M. J.; Jayne, J. T.; Meads, R. F.; Worsnop, D. R.
Page Count	5
Abstract	Sulfur trioxide (SO3) has long been known to react with water to produce sulfuric acid (H2S04). It has been commonly assumed that the gas phase reaction in the Earth's atmosphere between SO3 and water vapor to produce sulfuric acid vapor is an important step in the production of sulfuric acid aerosol particles. The kinetics of the gas phase reaction of SO3 with water vapor have previously been studied by Castleman and co-workers, Wang et al and Reiner and Arnold. Each of these studies was carried out in a flow reactor, with the first two studies performed at low pressure (1-10 Torr) and the latter from approx. 30 to 260 Torr. Each of these studies measured 503 decays over a range of 1120 vapor levels, obtaining data consistent with interpreting the reaction of gaseous SO3 and 1120 as a bimolecular process. Experimental kinetics results reported here also cast serious doubt on the mechanism represented by reactions 1 and 2. It is not clear why previous experimental studies failed to observe a nonlinear dependence of SO3 consumption on water vaporconcentration. It is probable that sufficient water dimer exists in much of the Earth's atmos- phere to allow reaction 3 to participate in sulfuric acid vapor formation.
Keywords	Vapor phases Water vapor Gas flow Sulfuric acid Reprints Experimental data Aerosols Production Molecules Rates Low pressure Nonlinear systems Particles Oxides Response Chemical reactions Constants Kinetics Sulfur Concentration(Chemistry) Dimers Earth atmosphere Sulfur trioxide Pl4643gj01
Source Agency	Secretary of Defense Non Paid Reprints
NTIS Subject Category	55C - Meteorological Data Collection, Analysis, & Weather Forecasting 99F - Physical & Theoretical Chemistry 68A - Air Pollution & Control
Corporate Authors	Aerodyne Research, Inc., Billerica, MA.
Document Type	Journal Article
NTIS Issue Number	199518
Contract Number	NASI-19949

Gas Phase Reaction of Sulfur Trioxide With Water Vapor.

Gas Phase Reaction of Sulfur Trioxide With Water Vapor.
ADA289135

Publication Date	1994
Personal Author	Kolb, C. E.; Molina, M. J.; Jayne, J. T.; Meads, R. F.; Worsnop, D. R.
Page Count	5
Abstract	Sulfur trioxide (SO3) has long been known to react with water to produce sulfuric acid (H2S04). It has been commonly assumed that the gas phase reaction in the Earth's atmosphere between SO3 and water vapor to produce sulfuric acid vapor is an important step in the production of sulfuric acid aerosol particles. The kinetics of the gas phase reaction of SO3 with water vapor have previously been studied by Castleman and co-workers, Wang et al and Reiner and Arnold. Each of these studies was carried out in a flow reactor, with the first two studies performed at low pressure (1-10 Torr) and the latter from approx. 30 to 260 Torr. Each of these studies measured 503 decays over a range of 1120 vapor levels, obtaining data consistent with interpreting the reaction of gaseous SO3 and 1120 as a bimolecular process. Experimental kinetics results reported here also cast serious doubt on the mechanism represented by reactions 1 and 2. It is not clear why previous experimental studies failed to observe a nonlinear dependence of SO3 consumption on water vaporconcentration. It is probable that sufficient water dimer exists in much of the Earth's atmos- phere to allow reaction 3 to participate in sulfuric acid vapor formation.
Keywords	Vapor phases Water vapor Gas flow Sulfuric acid Reprints Experimental data Aerosols Production Molecules Rates Low pressure Nonlinear systems Particles Oxides Response Chemical reactions Constants Kinetics Sulfur Concentration(Chemistry) Dimers Earth atmosphere Sulfur trioxide Pl4643gj01
Source Agency	Secretary of Defense Non Paid Reprints
NTIS Subject Category	55C - Meteorological Data Collection, Analysis, & Weather Forecasting 99F - Physical & Theoretical Chemistry 68A - Air Pollution & Control
Corporate Authors	Aerodyne Research, Inc., Billerica, MA.
Document Type	Journal Article
NTIS Issue Number	199518
Contract Number	NASI-19949