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Oriented valorization of cellulose and xylan into anhydrosugars by using low-temperature pyrolysis
Fast pyrolysis is a promising method to convert cellulose and hemicellulose into anhydrosugars, but the current method is energy intensive and provides poor yield and selectivity for anhydrosugars. The possibility of using mineral acid pretreatment to achieve oriented pyrolysis of cellulose and xylan at low temperature was explored in this study. The pyrolysis behaviors and mechanism of cellulose and xylan were investigated by pyrolysis-gas chromatography/mass spectrometry and in-situ diffuse reflectance infrared Fourier transform spectroscopy combined with two-dimensional perturbation correlation infrared spectroscopy. The results showed that H2SO4impregnation and HCl-demineralization achieved the oriented pyrolysis of cellulose and xylan into anhydrosugars at 300 degrees C. The highest yields of levoglucosan and levoglucosenone (33.3 and 9.7%) were obtained from pyrolysis of 0.1%H2SO4-impregnated cellulose at 300 degrees C, while those of xylosan and 1,5-anhydro-4-deoxypent-1-en-3-ulose (19.4 and 8.4%) were produced from pyrolysis of HCl-demineralized xylan at 300 degrees C. It is inferred that H2SO4 could promote the condensation of hydroxyls at C6 and C1 positions and the cleavage of glycosidic bonds to form levoglucosan. And AAEMs could inhibit the intra-molecular dehydration of C3 hydroxyl and C2 hydrogen atom of levoglucosan to form levoglucosenone. The demineralization of xylan could promote the cleavage of glycosidic bonds and dehydration reactions to form xylosan and 1,5-anhydro-4-deoxypent-1-en3-ulose. These findings provide a simple method to achieve oriented pyrolysis of cellulose and xylan at low temperature.
- Chinese Academy of Science (中国科学院) China (People's Republic of)
- Chinese Academy of Science (中国科学院) China (People's Republic of)
CATALYTIC FAST PYROLYSIS, LIGNOCELLULOSIC BIOMASS PYROLYSIS, Energy & Fuels, 550, FUELS, Chemical, HEMICELLULOSE, 540, Anhydrosugar, Torrefaction, Engineering, Low-temperature Pyrolysis, LEVOGLUCOSENONE, Biomass, Mechanism, Pretreatment
CATALYTIC FAST PYROLYSIS, LIGNOCELLULOSIC BIOMASS PYROLYSIS, Energy & Fuels, 550, FUELS, Chemical, HEMICELLULOSE, 540, Anhydrosugar, Torrefaction, Engineering, Low-temperature Pyrolysis, LEVOGLUCOSENONE, Biomass, Mechanism, Pretreatment
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average
