Structural and chemical modifications of typical South African biomasses during torrefaction

作者：Mafu Lihle D; Neomagus Hein W J P^*; Everson Raymond C; Carrier Marion; Strydom Christien A; Bunt John R

来源：Bioresource Technology, 2016, 202: 192-197.

DOI：10.1016/j.biortech.2015.12.007

• Biomass
• Torrefaction
• CP-MAS C-13 NMR
• XRD

Torrefaction experiments were carried out for three typical South African biomass samples (softwood chips, hardwood chips and sweet sorghum bagasse) to a weight loss of 30 wt.%. During torrefaction, moisture, non-structural carbohydrates and hemicelluloses were reduced, resulting in a structurally modified torrefaction product. There was a reduction in the average crystalline diameter (La) (XRD), an increase in the aromatic fraction and a reduction in aliphatics (substituted and unsubstituted) (CPMAS C-13 NMR). The decrease in the aliphatic components of the lignocellulosic material under the torrefaction conditions also resulted in a slight ordering of the carbon lattice. The degradation of hemicelluloses and non-structural carbohydrates increased the inclusive surface area of sweet sorghum bagasse, while it did not change significantly for the woody biomasses.

• 出版日期2016-2
• 单位西北大学