OcrV1, Main, Exploration, bibRecord, 000188

Role of Organic Carbon in Heterogeneous Reaction of N02 with Soot

Identifieur interne : 000188 ( Main/Exploration ); précédent : 000187; suivant : 000189

Role of Organic Carbon in Heterogeneous Reaction of N02 with Soot

Auteurs : CHONG HAN [République populaire de Chine] ; YONGCHUN LIU [République populaire de Chine] ; HONG HE [République populaire de Chine]

Source :

Environmental science & technology [ 0013-936X ] ; 2013.

RBID : Pascal:13-0320653

Descripteurs français

Pascal (Inist)
- Résidu combustion, Matériau carboné, Suie, Pollution air, Composition chimique, Chimie atmosphérique, Réaction hétérogène, Dioxyde d'azote, Qualité air, Relation composition propriété, Oxydant photochimique, Composé de l'azote.

English descriptors

KwdEn :
- Air pollution, Air quality, Atmospheric chemistry, Carbonaceous materials, Chemical composition, Combustion residue, Heterogeneous reaction, Nitrogen compounds, Nitrogen dioxide, Photochemical oxidants, Property composition relationship, Soot.

Abstract

A large uncertainty among the reported uptake coefficients of NO₂ on soot highlights the importance of the composition of soot in this reaction. Soot samples with different fractions of organic carbon (OC) were prepared by combusting n-hexane under controlled conditions. The heterogeneous reaction of NO₂ on soot was investigated using a flow tube reactor at ambient pressure. The soot with the highest fuel/oxygen ratio showed the largest uptake coefficient (γ_initial) of NO₂ and yield of HONO (y_HONO). Compared to fresh soot samples, preheated samples exhibited a great decrease in uptake coefficient of NO₂ and HONO yield due to the removal of OC from soot. Ozonized soot also showed a lower reactivity toward NO₂ than fresh soot, which can be ascribed to the consumption of OC with a reduced state (OC_R). A linear dependence of the NO₂ uptake coefficient and yields of HONO and NO on the OC_R content of the soot was established, with γ_initial(NO₂) = (1.54 ± 1.39) X 10^-6 + (1.96 ± 0.35) × 10^-7 × OC_R, y_HONO = (11.6 ± 16.1) + (1.3 ± 0.40) × OC_R, and y_NO = (13.1 ± 1.9) - (0.2 ± 0.05) × OC_R, respectively.

Affiliations:

République populaire de Chine

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to stream PascalFrancis, to step Corpus: 000044
to stream PascalFrancis, to step Curation: 000724
to stream PascalFrancis, to step Checkpoint: 000031
to stream Main, to step Merge: 000191
to stream Main, to step Curation: 000188

Le document en format XML

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<term>Chemical composition</term>
<term>Combustion residue</term>
<term>Heterogeneous reaction</term>
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<term>Nitrogen dioxide</term>
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<term>Pollution air</term>
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<term>Chimie atmosphérique</term>
<term>Réaction hétérogène</term>
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<front><div type="abstract" xml:lang="en">A large uncertainty among the reported uptake coefficients of NO<sub>2</sub>
 on soot highlights the importance of the composition of soot in this reaction. Soot samples with different fractions of organic carbon (OC) were prepared by combusting n-hexane under controlled conditions. The heterogeneous reaction of NO<sub>2</sub>
 on soot was investigated using a flow tube reactor at ambient pressure. The soot with the highest fuel/oxygen ratio showed the largest uptake coefficient (γ<sub>initial</sub>
) of NO<sub>2</sub>
 and yield of HONO (y<sub>HONO</sub>
). Compared to fresh soot samples, preheated samples exhibited a great decrease in uptake coefficient of NO<sub>2</sub>
 and HONO yield due to the removal of OC from soot. Ozonized soot also showed a lower reactivity toward NO<sub>2</sub>
 than fresh soot, which can be ascribed to the consumption of OC with a reduced state (OC<sub>R</sub>
). A linear dependence of the NO<sub>2</sub>
 uptake coefficient and yields of HONO and NO on the OC<sub>R</sub>
 content of the soot was established, with γ<sub>initial</sub>
(NO<sub>2</sub>
) = (1.54 ± 1.39) X 10<sup>-6</sup>
 + (1.96 ± 0.35) × 10<sup>-7</sup>
 × OC<sub>R</sub>
, y<sub>HONO</sub>
 = (11.6 ± 16.1) + (1.3 ± 0.40) × OC<sub>R</sub>
, and y<sub>NO</sub>
 = (13.1 ± 1.9) - (0.2 ± 0.05) × OC<sub>R</sub>
, respectively.</div>
</front>
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Role of Organic Carbon in Heterogeneous Reaction of N02 with Soot

Role of Organic Carbon in Heterogeneous Reaction of N02 with Soot

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri