Theoretical study on the atmospheric formation of sulfur trioxide as the primary agent for acid rain |
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Authors: | Morteza Vahedpour Moein Goodarzi Nasim Hajari Fariba Nazari |
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Institution: | (1) Department of Chemistry, Zanjan University, Zanjan, Iran;(2) Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), 45137-66731, Zanjan, Iran |
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Abstract: | The reaction mechanism of SO2 with O3 on the singlet potential energy surface has been investigated theoretically at the G3MP2B3//B3LYP/6-311+G(3df) level of theory.
The reactants are initially associated with adducts IN1(O2S–OOO) and IN2(OS-cyclic O4) in a barrier-less process. Subsequently, these adducts undergo isomerization and dissociation processes to produce cis-OSOO + 3O2, SO3(C
s
) + 3O2 and SO3(D
3h
) + 3O2 products. The SO3(D
3h
) + 3O2 is major product and the cis-OSOO + 3O2 and SO3(C
s
) + 3O2 are minor products. No stable pathway has been found for the formation of trans-OSOO and cyclic-SOOO isomers in the reaction of SO2 + O3. For major product, the rate constant of SO2 + O3 reaction is 2.30 × 10−23 cm3 molecule−1 s−1, at room temperature and atmospheric pressure. |
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Keywords: | |
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