The interaction of nitrogen dioxide with carbon and alumina particles

Conference · Tue Dec 01 04:00:00 EST 1987

OSTI ID:5518044

Gundel, L A; Guyot-Sionnest, N S; Novakov, T

Laboratory studies have shown that NO/sub 2/ gas adsorbed without reaction on alumina particles. At (NO/sub 2/) = 4 ppM in air, 11-12% of the NO/sub 2/ was removed from the gas stream. The trapped gas appeared as equal amounts of NO/sub 2//sup -/ and NO/sub 3//sup -/ in water extracts of the particles. NO/sub 2/ reacted with activated carbon particles, forming NO, NO/sub 2//sup -/, and NO/sub 3//sup -/. The major product was NO/sub 3//sup -/. Carbon removed 95-96% of the NO/sub 2/ entering at 4 ppM in air. At this concentration of NO/sub 2/, the presence of water vapor in the air stream did not have much effect on the ability of either of these types of particles to interact with the gas. At (NO/sub 2/) = 20 ppM, alumina displayed the same behavior as at the lower gas concentration, except that its trapping capacity decreased in the presence of humid air. At the higher NO/sub 2/ concentration, carbon particles showed dramatically different product distributions, depending on the presence of water vapor. In dry air NO dominated, followed by NO/sub 3//sup -/. In humid air about equal concentration of NO and NO/sub 2//sup -/ were formed. These results are consistent with surface oxidation of carbon particles and formation of surface nitrate. In the presence of water vapor, nitrous acid was formed from the interaction of NO and the surface nitrate. 12 refs., 3 figs., 2 tabs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5518044
• Report Number(s): LBL-24556; CONF-870853-5; ON: DE88005738
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107 -- Energy Conservation
Consumption
& Utilization-- Building Systems-- (1987-)
500200* -- Environment
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54 ENVIRONMENTAL SCIENCES
ADSORPTION
AIR POLLUTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CHALCOGENIDES
COMPARATIVE EVALUATIONS
ELEMENTS
HAZARDS
HEALTH HAZARDS
HUMIDITY
INDOOR AIR POLLUTION
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
POLLUTION
RESPONSE MODIFYING FACTORS
SORPTION
SURFACES