Functional groups evolvement and charcoal formation during lignin pyrolysis/carbonization
In order to produce high added value functional charcoal by biomass, a thermo-gravimet-ric analyzer coupled with a fourier transform infrared spectrometry system (TG-FTIR) was applied to investigate the relationship with functional groups evolvement and charcoal formation during lignin pyrolysis/carbonization. And electrical resistivity of charcoals was also tested. Experiment results show that the moisture is volatilized below 200 ℃. Pyrolysis occurs at 200 to 500 ℃ and charcoal begins to form. At 500 to 900 ℃, C-C bonds and C-H bonds in charcoal break further, phenyls become aromatized and form amorphous carbon, meanwhile, electrical resistivity of charcoal is reduced rapidly from 986 Ω · cm to 0. 6 Ω · cm. At 900 to 1 400 ℃ the structure of charcoal gets reconstructed to form a new structure which lies between amorphous carbon and graphite. Meanwhile the electrical resistivity of charcoal is further reduced to lower, about 0. 2 Ω · cm.
国家科技期刊平台
NSTL
万方数据
维普
