Nitrate radical generation via continuous generation of dinitrogen pentoxide in a laminar flow reactor coupled to an oxidation flow reactor

Lambe, Andrew T.; Wood, Ezra C.; Krechmer, Jordan E.; Majluf, Francesca; Williams, Leah R.; Croteau, Philip L.; Cirtog, Manuela; Féron, Anaïs; Petit, Jean-Eudes; Albinet, Alexandre; Jimenez, Jose L.; Peng, Zhe

Oxidation flow reactors (OFRs) are an emerging tool for studying the formation and oxidative aging of organic aerosols and other applications. The majority of OFR studies to date have involved the generation of the hydroxyl radical (OH) to mimic daytime oxidative aging processes. In contrast, the use of the nitrate radical (inline-formulaNO3) in modern OFRs to mimic nighttime oxidative aging processes has been limited due to the complexity of conventional techniques that are used to generate inline-formulaNO3. Here, we present a new method that uses a laminar flow reactor (LFR) to continuously generate dinitrogen pentoxide (inline-formulaN2O5) in the gas phase at room temperature from the inline-formulaNO2 + inline-formulaO3 and inline-formulaNO2 + inline-formulaNO3 reactions. The inline-formulaN2O5 is then injected into a dark Potential Aerosol Mass (PAM) OFR and decomposes to generate inline-formulaNO3; hereafter, this method is referred to as “OFR-iinline-formulaN2O5” (where “i” stands for “injected”). To assess the applicability of the OFR-iinline-formulaN2O5 method towards different chemical systems, we present experimental and model characterization of the integrated inline-formulaNO3 exposure, inline-formulaNO3:O3, inline-formulaNO2:NO3, and inline-formulaNO2:O2 as a function of LFR and OFR conditions. These parameters were used to investigate the fate of representative organic peroxy radicals (inline-formulaRO2) and aromatic alkyl radicals generated from volatile organic compound (VOC) inline-formula+inline-formulaNO3 reactions, and VOCs that are reactive towards both inline-formulaO3 and inline-formulaNO3. Finally, we demonstrate the OFR-iinline-formulaN2O5 method by generating and characterizing secondary organic aerosol from the inline-formulaβ-pinene inline-formula+inline-formulaNO3 reaction.

Zitieren

Zitierform:

Lambe, Andrew T. / Wood, Ezra C. / Krechmer, Jordan E. / et al: Nitrate radical generation via continuous generation of dinitrogen pentoxide in a laminar flow reactor coupled to an oxidation flow reactor. 2020. Copernicus Publications.

Zugriffsstatistik

Gesamt:
Volltextzugriffe:
Metadatenansicht:
12 Monate:
Volltextzugriffe:
Metadatenansicht:

Grafik öffnen

Rechte

Rechteinhaber: Andrew T. Lambe et al.

Nutzung und Vervielfältigung:

Export