Falling-body Experiment on Fast Cellulose Pyrolysis Accompanied by CaO

Deoxygenization effect of CaO on bio-oil from biomass pyrolysis was studied by a series of freely falling body-radiation heating experiments.GC-MS analysis results on bio-oil samples show that the primary pyrolysis product of cellulose is levoglucosan(LG).In the bio-oil product respectively obtained from pyrolysis of pure cellulose,cellulose with addition of 33% and 56% CaO,the corresponding LG mass percentage is 59.1%,35.8% and 25.1%.With addition of CaO,mass percentage of LG,which contains highest oxygen content in bio-oil,reduces sharply.That means CaO plays an important role in bio-oil deoxygenization.Calculation results show that during cellulose pyrolysis with addition of 33% and 56% CaO,the oxygen content can be reduced respectively by 10% and 12.5%,demonstrating that CaO can fix CO_2 or similar intermediate products,which makes pyrolysis parallel reactions towards the direction of glucose decomposing and reforming.