Primary Thermal Decomposition Pathways of Hydroxycinnamaldehydes
نویسندگان
چکیده
Hydroxycinnamaldehyde monomers are important intermediates in the lignin biosynthesis and can be incorporated into plants large quantities via genetic modification. They also products formed during pyrolysis or combustion of lignocellulose. In this work, decomposition three hydroxycinnamaldehyde model compounds, cinnamaldehyde, p-coumaraldehyde, coniferaldehyde, was studied a micropyrolysis reactor equipped with an online GC × GC-FID/TOF-MS coupled customized for analysis all vapors including permanent gases. The vaporization sublimation process these compounds fitted well based on experimental time-resolved data. dominating initial pathways were elucidated from first-principles kinetic usage rate production analysis. For cinnamaldehyde (at 773–1123 K) p-coumaraldehyde 873–1123 K), concerted decarbonylation reactions condensed phase determine decomposition, almost no contribution radical chemistry. coniferaldehyde 773–1023 homolysis O-methyl (O–CH3) bond initiates chain mechanism at temperatures above 773 K, H atom abstraction aldehyde group is most dominant consumption pathway high temperatures. presence methoxy groups aromatic rings accelerates hydroxycinnamaldehydes. Models that do not account structural differences will have difficulties prediction real lignocellulosic biomass.
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ژورنال
عنوان ژورنال: Energy & Fuels
سال: 2021
ISSN: ['1520-5029', '0887-0624']
DOI: https://doi.org/10.1021/acs.energyfuels.1c01662