Modeling the radical chemistry in an oxidation flow reactor: radical formation and recycling, sensitivities, and the OH exposure estimation equation

The Journal of Physical Chemistry. a
Rui LiJose L Jimenez

Abstract

Oxidation flow reactors (OFRs) containing low-pressure mercury (Hg) lamps that emit UV light at both 185 and 254 nm ("OFR185") to generate OH radicals and O3 are used in many areas of atmospheric science and in pollution control devices. The widely used potential aerosol mass (PAM) OFR was designed for studies on the formation and oxidation of secondary organic aerosols (SOA), allowing for a wide range of oxidant exposures and short experiment duration with reduced wall loss effects. Although fundamental photochemical and kinetic data applicable to these reactors are available, the radical chemistry and its sensitivities have not been modeled in detail before; thus, experimental verification of our understanding of this chemistry has been very limited. To better understand the chemistry in the OFR185, a model has been developed to simulate the formation, recycling, and destruction of radicals and to allow the quantification of OH exposure (OHexp) in the reactor and its sensitivities. The model outputs of OHexp were evaluated against laboratory calibration experiments by estimating OHexp from trace gas removal and were shown to agree within a factor of 2. A sensitivity study was performed to characterize the dependence of the OH...Continue Reading

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Citations

Jan 11, 2017·Environmental Science & Technology·Shantanu H JatharDelphine K Farmer
Apr 22, 2020·Chemical Society Reviews·Zhe Peng, Jose L Jimenez
Jan 1, 2020·Atmospheric Chemistry and Physics·Nathan J JanechekCharles O Stanier
May 31, 2018·Environmental Science & Technology·Provat K SahaAndrew P Grieshop
Aug 14, 2019·Environmental Science & Technology·Panu KarjalainenJorma Keskinen
Jun 24, 2017·Environmental Science & Technology·Stephen M ReeceAndrew P Grieshop
Feb 23, 2019·Environmental Science & Technology·Tengyu LiuChak K Chan
Aug 22, 2017·Environmental Science & Technology·Beth FriedmanDelphine K Farmer
Feb 21, 2018·Environmental Science & Technology·Quanfu HeYinon Rudich
Dec 31, 2020·Environmental Science & Technology·Xiangxinyue MengMin Hu

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