Thermogravimetric behaviors of biomass′ chemical components under air or syngas

The thermogravimetric behaviors of biomass' chemical components(cellulose,hemicellulose and lignin) were studied in a thermogravimetric analyzer(TGA92) under air or syngas.The decomposing temperatures of the three components were examined.In order to understand the interaction between the three components,the synthesized samples(a mixture of these components with different ratios) were tested.Meanwhile,the experimental and calculated TG and DTG profiles were compared.The results show that both under air and syngas,among the three components,hemicellulose is the easiest one to be decomposed,while lignin is the most difficult one.Under different atmospheres the thermogravimetric behavior of each component is different.Both lignin and hemicellulose will affect the pyrolysis characteristic of cellulose under syngas,while both cellulose and hemicellulose will affect the combustion characteristic of lignin under air,which are related to the range of decomposing temperatures.