title: Multi-Gaussian-DAEM-reaction model for thermal decompositions of cellulose, hemicellulose and lignin: comparison of N₂ and CO₂ atmosphere.
abstract: Thermal decompositions of three components of biomass (cellulose, hemicellulose and lignin) were studied using nonisothermal thermogravimetric analysis (TGA) under both oxidative and inert atmospheres at a heating rate of 10 K min(-1). The multi-Gaussian-distributed activation energy model (DAEM)-reaction model was first developed to describe thermal decomposition behaviors of three components. Results showed that the presence of CO₂ enhanced the thermal decompositions of three components in high temperature range, but made little difference in low temperature range. Decomposition behaviors under CO₂ were analyzed by the two-stage reaction mechanism corresponding to the pyrolysis process of original materials and the gasification process of char. During gasification stage, CO₂ was reduced to CO, which provided a possibility of a reduction in greenhouse gas emissions. In addition, more CO was produced, and therefore the thermal value of gas was improved. The findings imply that CO₂ gasification technology of biomass has great research significance.
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China. Electronic address: chentianju27@gmail.com.
authors.forename: Tianju
authors.initials: T
authors.lastname: Chen
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China.
authors.forename: Jingli
authors.initials: J
authors.lastname: Wu
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China. Electronic address: wujh@qibebt.ac.cn.
authors.forename: Jinhu
authors.initials: J
authors.lastname: Wu
mesh_terms: D018533:Biomass; D001709:Biotechnology / Q000379:methods; D002245:Carbon Dioxide; D002482:Cellulose / Q000737:chemistry*; D006358:Hot Temperature; D007700:Kinetics; D008031:Lignin / Q000737:chemistry*; D008956:Models, Chemical; D009584:Nitrogen; D011134:Polysaccharides / Q000737:chemistry*; D059205:Renewable Energy; D013818:Thermogravimetry / Q000379:methods*
chemical_list: D011134:Polysaccharides; D002245:Carbon Dioxide; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; D009584:Nitrogen
keywords: Distributed activation energy model (DAEM); Gasification; Kinetic analysis; Pyrolysis; Thermogravimetric analysis (TGA)