Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
Carbohydr Polym. 2013 Oct 15;98(1):514-21. doi: 10.1016/j.carbpol.2013.06.031. Epub 2013 Jun 26.
Cellulose degradation under inert (He) and oxidative atmospheres (7% O2, 20% O2 and 60% O2) was investigated through thermogravimetric (TG) equipped with mass spectroscopy (MS) system. Two mass loss stages were observed for cellulose degraded under oxidative atmosphere, where the first mass loss stage is close to that under inert atmosphere, and the second one designated to char oxidation was enhanced by the increased oxygen concentration. The evolution of prominent volatiles including furfural, acetone, 2/5-hydromethyl furfural, formaldehyde, CO and CO2 was examined considering the influence of oxygen concentration. The plateau for mass loss and evolution of some volatiles leads to the difficulty to determine the division-point for the two stages. However, the fitting parameter (Dev%) around 5% confirms the applicability of the proposed two-stage kinetic model accounting for partial pressure of oxygen.
通过配备质谱仪 (MS) 的热重 (TG) 系统研究了惰性 (He) 和氧化气氛 (7% O2、20% O2 和 60% O2) 下的纤维素降解。在氧化气氛下降解的纤维素观察到两个质量损失阶段，其中第一个质量损失阶段与惰性气氛下的质量损失阶段接近，第二个阶段指定为炭氧化，随着氧气浓度的增加而增强。考虑到氧气浓度的影响，检查了包括糠醛、丙酮、2/5-羟甲基糠醛、甲醛、CO 和 CO2 在内的显著挥发性物质的演变。质量损失的平台和一些挥发性物质的演化导致难以确定两个阶段的分界点。然而，拟合参数 (Dev%) 约为 5% 证实了所提出的两阶段动力学模型适用于部分氧气压力。
