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• W3208439287 endingPage "111799" @default.
• W3208439287 startingPage "111799" @default.
• W3208439287 abstract "To explore the potential interactions between toluene/benzyl and the common C3 combustion intermediates, toluene-propylene and toluene-propyne co-pyrolysis is studied in the current work by taking neat toluene pyrolysis as a reference. Experiments are carried out at a nominal pressure of 20 bar over a temperature range of 1050−1700 K, using a single-pulse shock tube facility coupled to the gas chromatography-mass spectrometry speciation diagnostic technique. Temperature-dependent mole fraction profiles are obtained for numerous species ranging from small-molecule products to three-ring polycyclic aromatic hydrocarbons (PAHs). A kinetic model, which has been under development in our serial works, is extended by including the interplays between toluene/benzyl and propylene/propyne chemistry. The updated model can satisfactorily predict the measurements, regarding the absolute mole fractions as well as the variation trends brought by different initial fuel compositions. Increased reactivity is observed in the conversion of toluene with the presence of propylene or propyne, while the consumption rates of the studied C3 fuels are barely influenced by toluene. Benzene formation is facilitated by the C3+C3 reactions introduced by the C3 fuels. The pyrolysis of propylene (or propyne) significantly enhances the level of C1−C3 molecules/radicals that further react with aromatic species. For instance, the reactions of benzyl+propyne result in much higher mole fractions and lower speciation temperature windows of indene and naphthalene in toluene-propylene (or propyne) co-pyrolysis. The reactions with small hydrocarbons result in reduced levels of benzyl and other C7 radicals in the reaction system in toluene- propylene (or propyne) co-pyrolysis. Consequently, for the PAHs which are mainly formed through C7+C7 reactions, such as bibenzyl and phenanthrene, the mole fractions are lowered by the addition of propylene (or propyne). Propyne has more obvious influences on the species pool of toluene pyrolysis than propylene, because the effective C7C3 interactions are mostly through the reactions between toluene/benzyl and propyne/propargyl in both cases of toluene-propylene and toluene-propyne co-pyrolysis." @default.
• W3208439287 created "2021-11-08" @default.
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• W3208439287 date "2022-02-01" @default.
• W3208439287 modified "2023-10-18" @default.
• W3208439287 title "Influences of propylene/propyne addition on toluene pyrolysis in a single-pulse shock tube" @default.
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• W3208439287 doi "https://doi.org/10.1016/j.combustflame.2021.111799" @default.
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