Photooxidation of sulfur dioxide on the surface of magnesium oxide

Journal Article · Thu Apr 24 04:00:00 EDT 1975 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100576a010· OSTI ID:7232018

Lin, M J; Lunsford, J H

The photooxidation of sulfur dioxide on the surface of magnesium oxide in the presence of adsorbed water vapor and oxygen or nitrous oxide is studied in relation to the chemistry of atmospheric aerosols. Water reacts with adsorbed SO/sub 2/ to increase the concentration of sulfite ions and monodentate sulfito complexes. Subsequent photolysis leads to the formation of sulfite ion. Molecular oxygen or N/sub 2/O serve as electron scavengers, thus increasing the surface concentration of sulfite. The greater stability of sulfite ion on surface s relative to aqueous solutions is attributed to the lack of mobility in the adsorbed water. The half-life of the surface sulfite is greater than 10 hr at 25 C but drops off to 0.5 min at 100 C.

• OSTI ID: 7232018
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 79:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COLLOIDS
DISPERSIONS
KINETICS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL OXIDANTS
POLLUTION
REACTION KINETICS
SOLS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES