The nitration of pyrene adsorbed on silica particles by nitrogen dioxide

Citation
Hm. Wang et al., The nitration of pyrene adsorbed on silica particles by nitrogen dioxide, CHEMOSPHERE, 41(9), 2000, pp. 1479-1484
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
CHEMOSPHERE
ISSN journal
0045-6535 → ACNP
Volume
41
Issue
9
Year of publication
2000
Pages
1479 - 1484
Database
ISI
SICI code
0045-6535(200011)41:9<1479:TNOPAO>2.0.ZU;2-H
Abstract
Conversion of NO2, HNO2 gas, their mixture and a mixed gas of HNO2 and HNO3 on silica particles was investigated under simulated atmospheric condition s. Both HNO2 and HNO3 were detected as the products from conversion of NO2 on silica particles. However, unlike HNO3, which increased with conversion time, HNO2 underwent an increase-decrease time course due to the increased HNO3 further transformed HNO2 into NO+ on silica particles. Considering the catalytic effect of HNO3 and HNO2 on the nitration of pyrene adsorbed on s ilica particles by NO2, another electrophilic nitration path, analogous to the one that we previously reported, with NONO2+ and NON2O4+ as electrophil es was suggested. The two paths together gave an appropriate explanation fo r the catalytic effect of HNO2, HNO3 and their mixed gas on the nitration o f the adsorbed pyrene by NO2. (C) 2000 Elsevier Science Ltd. All rights res erved.