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- W3083079051 abstract "We report experiments of ozone-initiated low-temperature oxidation of methyl crotonate (MC, CH3—CH═CH—C(O)OCH3) from 420 to 660 K in a near-atmospheric-pressure jet-stirred reactor using photoionization molecular-beam mass spectrometry as a sampling technique. In this temperature regime, no typical low-temperature combustion (LTC) reactions have been observed for MC when oxygen (O2) is used as the oxidizer. Upon ozone addition, significant oxidation of methyl crotonate is found. On the basis of experimentally observed energy-dependent mass peaks in combination with temperature-dependent mole fraction profiles and photoionization efficiency curves, we provide new insights into the methyl crotonate ozonolysis reaction network. The observed MC + O3 products, C5H8O5, are found to be related to the keto-hydroperoxides resulting from the isomerization of the primary ozonide. Evidence is also provided that molecular growth mainly results from cycloaddition reactions of the Criegee intermediate into aldehydes and alkenes as well as addition reactions of the Criegee intermediates to the double bond of methyl crotonate and sequential decomposition into ketones. Furthermore, species that contribute in large amounts to the low-temperature oxidation of methyl crotonate, like H2O2, CH3OOH, CH3OH, and HC(O)OH, are identified, and their mole fractions are reported. Additionally, preliminary modeling is performed which qualitatively captures the observed NTC behavior and reveals future research opportunities." @default.
- W3083079051 created "2020-09-11" @default.
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- W3083079051 date "2020-09-05" @default.
- W3083079051 modified "2023-10-12" @default.
- W3083079051 title "Molecular-Weight Growth in Ozone-Initiated Low-Temperature Oxidation of Methyl Crotonate" @default.
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- W3083079051 doi "https://doi.org/10.1021/acs.jpca.0c05684" @default.
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