Identification of combustion intermediates in a low-pressure premixed laminar 2-methylfuran/oxygen/argon flame

The chemical structure of a low-pressure premixed laminar 2-methylfuran/oxygen/argon flame with an equivalence ratio of 0.8 was investigated by using tunable synchrotron vacuum ultraviolet photoionization and molecular-beam mass spectrometry. The photoionization mass spectra of 2-methylfuran/oxygen/argon flame and the photoionization efficiency curves of the combustion intermediates were recorded. The ionization energies of combustion intermediates were identified from the photoionization efficiency curves. The combustion intermediates were identified by comparing the measured ionization energies with those reported in literature or those calculated by the method of ab initio. The possible reaction pathways of 2-methylfuran and its primary combustion derivatives were proposed based on the intermediates identified.