title: Thermal degradation of xylan-based hemicellulose under oxidative atmosphere.
abstract: Xylan-based hemicellulose sample is tested in TG-MS under He, 7% O2, 20% O2 and 60% O2, in order to underpin the understanding of thermo-degradation mechanism of hemicellulose and biomass. The mass loss history recorded by TG can be divided into two main stages: (1) low-temperature stage with the peak located at around 265°C associated with thermal cracking of hemicellulose, and (2) high-temperature stage with the peak enhanced and shifted to lower temperatures by oxygen concentration ascribed to char combustion. A number of prominently evolved ions identified by MS can be designated to acetone, acetic acid, furfural, water, CO, CO2 and so on. The releasing profile of smaller fragments (water, CO and CO2) follows the pattern of DTG curve under different oxygen concentrations (especially for that in the high temperature stage). A three-step consecutive kinetic model employing "n-order reaction function" is proposed and achieved good fit for the experimental mass loss data of thermo-oxidation of hemicellulose.
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, PR China.
authors.forename: Dekui
authors.initials: D
authors.lastname: Shen
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, PR China.
authors.forename: Lanqing
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Jiangsu Frontier Electric Power Technology Co., Ltd., Nanjing 211102, PR China.
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Xue
authors.affiliation: Jiangsu Frontier Electric Power Technology Co., Ltd., Nanjing 211102, PR China.
authors.forename: Shipian
authors.initials: S
authors.lastname: Guan
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, PR China. Electronic address: 101011398@seu.edu.cn.
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, PR China.
authors.forename: Rui
authors.initials: R
authors.lastname: Xiao
mesh_terms: D001272:Atmosphere / Q000737:chemistry*; D010084:Oxidation-Reduction; D011134:Polysaccharides / Q000737:chemistry*; D013696:Temperature; D014990:Xylans / Q000737:chemistry*
chemical_list: D011134:Polysaccharides; D014990:Xylans; C007916:hemicellulose
keywords: 1-Hydroxyl propanone (PubChem CID: 8299); Acetic acid (PubChem CID: 176); Acetone (PubChem CID: 180); Formaldehyde (PubChem CID: 62705); Furfural (PubChem CID: 7362); Hemicellulose; Kinetic model; TG-MS; Thermo-oxidation; Xylan (PubChem CID: 50909243)