NO₂ Suppression of Autoxidation-Inhibition of Gas-Phase Highly Oxidized Dimer Product Formation.

ABSTRACT: Atmospheric autoxidation of volatile organic compounds (VOC) leads to prompt formation of highly oxidized multifunctional compounds (HOM) that have been found crucial in forming ambient secondary organic aerosol (SOA). As a radical chain reaction mediated by oxidized peroxy (RO₂) and alkoxy (RO) radical intermediates, the formation pathways can be intercepted by suitable reaction partners, preventing the production of the highest oxidized reaction products, and thus the formation of the most condensable material. Commonly, NO is expected to have a detrimental effect on RO₂ chemistry, and thus on autoxidation, whereas the influence of NO₂ is mostly neglected. Here it is shown by dedicated flow tube experiments, how high concentration of NO₂ suppre

SUBMITTER: Rissanen MP 

PROVIDER: S-EPMC6251564 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature