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What are the emissions created from the oxidation of furfural? 


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The oxidation of furfural results in the generation of various emissions. When furfural reacts with OH radicals in the atmosphere, it forms intermediate radicals that can further react with O3, NO2, HO2/RO2, etc.. Additionally, the reactions of furfural with tropospheric oxidants like Cl, OH, and NO3 produce gas-phase products such as 5-chloro-2(5H)-furanone, maleic anhydride, 2-nitrofuran, and CO, with the potential formation of Secondary Organic Aerosol (SOA) particles under certain conditions. Furthermore, the oxidation of furfural and its derivatives using dissolved oxygen and specific metal salt catalysts can lead to the production of various compounds like 2,5-diformylfuran (DFF), 2,5-furandicarboxylic acid (FDCA), and ester derivatives.

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Not addressed in the paper.
Emissions from furfural oxidation include R2B and R5B radicals, which react slowly with O2 but can directly interact with O3, NO2, HO2/RO2, etc., in the atmosphere.
Emissions from furfural oxidation include 5-chloro-2(5H)-furanone, maleic anhydride, 2-nitrofuran, and CO. Ultrafine particles (<1 µm) formed can potentially harm the respiratory system.
Not addressed in the paper.
Emissions from furfural oxidation include 2,5-diformylfuran (DFF) and 2,5-furandicarboxylic acid (FDCA) with Co(II), Mn(II), Ce(III) salt catalysts, or mixtures, producing ester derivatives from ether derivatives.

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