气候变化领域集成服务门户(CCPortal): Effects of adsorbed water and hydrocarbon reactivity on the nitration of polycyclic aromatic hydrocarbons adsorbed on silica gel and Fe2O3 particles with NO2

CCPortal

DOI	10.1016/j.atmosenv.2020.117641
	Effects of adsorbed water and hydrocarbon reactivity on the nitration of polycyclic aromatic hydrocarbons adsorbed on silica gel and Fe2O3 particles with NO2
	Hasegawa K.; Takanami T.; Kawai T.; Kagaya S.
发表日期	2020
ISSN	1352-2310
卷号	236
英文摘要	Here, the nitration of polycyclic aromatic hydrocarbons (PAHs) adsorbed on SiO2 and Fe2O3 particles, which are abundant in PM2.5, with NO2 (9.77 ppm) was studied using a fluidized-bed column to simulate the transformation of atmospheric PAHs at night. Silica gel was used as SiO2, and anthracene, phenanthrene, pyrene, chrysene, fluoranthene, and perylene were used as PAHs. The effects of water (H2Oads) adsorbed on the substrates and the reactivity of PAHs on the transformation kinetics and mechanism were investigated. On the hydrated silica gel (H2Oads: 4.2 wt%), the most reactive PAH (perylene) was nitrated following a pseudo-first-order reaction, and moderately (anthracene and pyrene) and less reactive (chrysene) PAHs were nitrated by a H+-autocatalyzed reaction. However, on dry Fe2O3 (H2Oads: 0.02 wt%), the nitration of the moderately reactive PAHs proceeded following a pseudo-first-order reaction, and chrysene was nitrated by a H+-autocatalyzed reaction. On both substrates, the nitration of PAHs changed from pseudo-first-order to H+-autocatalyzed reactions as the reactivity of the PAHs decreased, indicating that the nitration kinetics and mechanism are affected by the concentration of H+ formed in H2Oads upon exposure to NO2. On dry Fe2O3, perylene and the moderately reactive PAHs were nitrated by NO2, while the moderately reactive PAHs and chrysene were nitrated by NO2+ on the hydrated silica gel, which would be formed via a pre-equilibrium reaction between NO2 and H+ formed by NO2 exposure and released by nitration. The formation of NO2+ is supported by the acceleration of the H+-autocatalyzed nitration on the H2SO4-adsorbed hydrated silica gel and by the detection of NO2+ on hydrated borosilicate glass. © 2020 Elsevier Ltd
英文关键词	Autocatalyzed reaction mechanism; Fe2O3; Nitration kinetics; Nitrogen dioxide; Polycyclic aromatic hydrocarbons; Silica gel
语种	英语
scopus关键词	Anthracene; Borosilicate glass; Fluidized beds; Hematite; Hydration; Mineral oils; Nitrogen oxides; Pyrene; Silica; Silica gel; Silicon; Hydrated silica; Hydrocarbon reactivity; Nitration kinetics; Polycyclic aromatic hydrocarbons (PAHS); Pre-equilibrium reactions; Pseudo-first order reactions; Pseudo-first-order; Transformation kinetics; Nitration; catalysis; iron oxide; nitrogen dioxide; PAH; reaction kinetics; silica
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129410
作者单位	Department of Environmental Applied Chemistry, Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan
推荐引用方式 GB/T 7714	Hasegawa K.,Takanami T.,Kawai T.,et al. Effects of adsorbed water and hydrocarbon reactivity on the nitration of polycyclic aromatic hydrocarbons adsorbed on silica gel and Fe2O3 particles with NO2[J],2020,236.
APA	Hasegawa K.,Takanami T.,Kawai T.,&Kagaya S..(2020).Effects of adsorbed water and hydrocarbon reactivity on the nitration of polycyclic aromatic hydrocarbons adsorbed on silica gel and Fe2O3 particles with NO2.Atmospheric Environment,236.
MLA	Hasegawa K.,et al."Effects of adsorbed water and hydrocarbon reactivity on the nitration of polycyclic aromatic hydrocarbons adsorbed on silica gel and Fe2O3 particles with NO2".Atmospheric Environment 236(2020).