School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.
Carbohydr Polym. 2023 Apr 1;305:120518. doi: 10.1016/j.carbpol.2022.120518. Epub 2022 Dec 30.
The pyrolysis kinetics of cellulosic fibres, a natural cotton yarn (NCY) and a mercerized cotton yarn (MCY), has been explored with a modified first order global analysis method (FOG), via a series of non-isothermal experiments, using thermogravimetric analysis (TGA). The modified FOG analysis routine was developed to overcome discrepancy in heating rate and the difference between exact results and approximations in integrals. The intrinsic pyrolysis activation energy, with temperature range tending to zero, was found to be independent of heating rate and approximation used, giving average values of 153 ± 2 kJ/mol for NCY and 192 ± 7 kJ/mol for MCY. This proves the applicability of the reported analysis routine under the conducted TGA measurements. The reasons for different values were hypothesized to be the difference in chemical composition and crystalline structure. The findings provide a new approach in the investigation on pyrolysis kinetics of biomass and factors impacting their pyrolytic behaviour.
采用热重分析（TGA），通过一系列非等温热重实验，用改进的一级全局分析方法（FOG）对纤维素纤维、天然棉纱（NCY）和丝光棉纱（MCY）的热解动力学进行了研究。改进的 FOG 分析程序是为了克服升温速率的差异以及积分的精确结果和近似值之间的差异而开发的。在趋于零的温度范围内，固有热解活化能与升温速率无关，也与使用的近似值无关，为 NCY 和 MCY 分别给出了 153±2kJ/mol 和 192±7kJ/mol 的平均数值。这证明了在进行的 TGA 测量下，报告的分析程序的适用性。造成数值不同的原因可能是化学成分和晶体结构的差异。这些发现为生物质热解动力学及其热解行为影响因素的研究提供了一种新方法。
