Laser micropyrolysis GC–MS of lignin

Lignin pyrolysis reactions

“…The chemical structures of the pyrolysis products of lignins have been evaluated by gas chromatography/mass spectrometry (GC/MS) [10][11][12], nuclear magnetic resonance (NMR) [12][13][14][15][16][17][18] and infrared (IR) spectroscopic [15,[19][20][21] analyses, along with pyrolysis directly coupled with GC/MS [22][23][24][25][26][27][28][29][30][31][32][33][34][35] and IR [19,[36][37][38][39] (Py-GC/MS, Py-IR). Aromatic methoxy groups are stable during the primary pyrolysis stage and become very reactive in the temperature range of 400-450 °C.…”

Pyrolysis Characteristic of Tobacco Stem Studied by Py-GC/MS, TG-FTIR, and TG-MS

“…3c, the release of large molecular volatile products was not as prominent, while the formation of CO was dominant. Based on previous researches (Greenwood et al 2002;Liu et al 2008), the releasing of CO at higher temperature was primarily caused by the dissociation of diaryl ether and the secondary cracking of volatiles.…”

Pyrolysis characteristics of bio-oil fractions separated by molecular distillation

“…The most significant bands of O-H at 3050-2800 cm À1 and 1180-943 cm À1 corresponded to the presence of alcohols or phenols, and the band at 2860-2770 cm À1 represented hydrocarbons. Bands at 2180 cm À1 and 2112 cm À1 that are characteristic of CO were not observed but they were present in the spectrum of the final stage, which was representative of the product of the secondary reaction generated by dissociation of the ether bond in the secondary cracking of volatiles [36]. The formation of CO 2 due to the break of the lateral C-C bond was dominant for all samples, and the hydroxyl was dominant for the fractions but not for the bio-oil.…”