A study of the interaction of NO/sub 2/ with carbon particles

Conference · Fri Apr 01 04:00:00 EST 1988

OSTI ID:5143467

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

The interaction of NO/sub 2/ in air (0.5-35 ppM) with carbon particles led to three products: NO gas, and NO/sub 2//sup /minus// and NO/sub 3//sup /minus//, removed from the particles by water extraction. At 4 ppM or below, in dry or humid air, the product distribution, in relative molar amounts, was NO/sub 3//sup /minus// = 2NO/sub 2//sup /minus// = 2NO. At 20 ppM and above, the relative amounts of products depended on the presence of water vapor: In dry air NO = 3NO/sub 3//sup /minus// = 6NO/sub 2//sup /minus//. In humid air NO = NO/sub 2//sup /minus// = 2NO/sub 3//sup /minus//. For carbon slurries in water, (NO/sub 2//sup /minus//) = 6(NO/sub 3//sup /minus//) at an input concentration of NO/sub 2/ of 4 ppM. In comparison to carbon, alumina particles and glass beads removed NO/sub 2/ ineffectively. These results indicate that NO/sub 2/ oxidized the carbon particles while it was reduced to NO. NO/sub 2/ adsorbed at oxidized sites on the particles formed a surface species that was analyzed as nitrate. At high enough concentration of NO/sub 2/ (20 ppM and above), the interaction of NO and water vapor with the surface nitrate produced NO/sub 2//sup /minus//. In slurries NO, generated from interaction of NO/sub 2/ with carbon, reacted with surface nitrate or nitric acid in solution to form the relatively large quantities of nitrite. This work suggests that NO/sub x/ reactions with carbon in droplets or on wet surfaces could be important sources for the production of nitrous acid in the environment. 19 refs., 7 figs., 1 tab.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5143467
• Report Number(s): LBL-24704; CONF-871055-5; CONF-871055-; ON: DE88010778
• Country of Publication: United States
• Language: English

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ADSORBENTS
AIR POLLUTION
CHALCOGENIDES
CHARCOAL
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
ENVIRONMENTAL EXPOSURE PATHWAY
INDOOR AIR POLLUTION
KINETICS
MINIMIZATION
MODIFICATIONS
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
REACTION KINETICS
VOLUME