Heterogeneous reactions of surface-adsorbed catechol with nitrogen dioxide: substrate effects for tropospheric aerosol surrogates

Physical Chemistry Chemical Physics : PCCP
Laurie A Woodill, Ryan Z Hinrichs

Abstract

Surface-adsorbed organics can alter the chemistry of tropospheric aerosols thereby impacting photochemical cycles and altering aerosol properties. The nature of the surface can also influence the chemistry of the surface-adsorbed organic. We employed diffuse reflectance infrared spectroscopy (DRIFTS) to monitor the adsorption of gaseous catechol on several tropospheric aerosol surrogates and to investigate the subsequent reactivity of adsorbed catechol with nitrogen dioxide. The dark heterogeneous reaction of NO(2) with NaCl-adsorbed catechol produced 4-nitrocatechol, 1,2-benzoquinone, and the ring-cleaved product muconic acid, with product yields of 88%, 8%, and 4% at relative humidity (RH) < 2%, respectively. The reaction was first-order with respect to both catechol and NO(2). The reactive uptake coefficient for NO(2) + NaCl-adsorbed catechol increased from 3 x 10(-6) at <2% RH to 7 x 10(-6) at 30% RH. These reactions were more than two orders of magnitude more reactive than NaCl without adsorbed catechol. The 4-nitrocatechol product yield was enhanced on NaF, while NaBr-adsorbed catechol produced considerably more 1,2-benzoquinone and muconic acid. This substrate effect is discussed in terms of each substrate's ability to p...Continue Reading

References

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Citations

Oct 25, 2011·Physical Chemistry Chemical Physics : PCCP·Daniel A KnopfJonathan H Slade
Aug 4, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Yulia SosedovaMarkus Ammann
May 14, 2016·Environmental Science & Technology·Ryan Z HinrichsJal J Trivedi
Nov 6, 2013·The Journal of Physical Chemistry. a·Manolis N RomaniasAggelos Philippidis
Jul 14, 2021·Environmental Science & Technology·Michael A RobinsonSteven S Brown
Jul 26, 2017·Environmental Science & Technology·Nicole K ScharkoJonathan D Raff

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