Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Dongguan University of Technology, Dongguan 523808, China.
Xinfeng Branch of Shaoguan Municipal Ecology and Environment Bureau, Shaoguan 511100, China.
Sci Total Environ. 2022 Sep 10;838(Pt 4):156560. doi: 10.1016/j.scitotenv.2022.156560. Epub 2022 Jun 8.
The performances and reaction kinetics of the bamboo shoot leaves (BSL) pyrolysis were characterized integrating thermogravimetry, Fourier transform infrared spectroscopy, and pyrolysis-gas chromatography/mass spectrometry analyses. The high volatiles and low ash, N, and S contents of BSL rendered its pyrolysis suitable for bio-oil generation. The main mass loss of BSL pyrolysis occurred in the devolatilization stage between 200 and 550 °C. The peak temperatures of pseudo-hemicellulose, cellulose and lignin pyrolysis in BSL were 248.04, 322.65 and 383.51 °C, respectively, while their average activation energies estimated by Starink method were 144.29, 175.79 and 243.02 kJ/mol, respectively. The one-dimensional diffusion mechanism (f (α) = 1/(2α)) best elucidated the hemicellulose reaction. The cellulose (f (α) = 0.74 (1 - α)[-ln (1 - α)]) and lignin (f (α) = 0.35 (1 - α)[-ln (1 - α)]) reactions were best described by the nucleation mechanisms. The estimated kinetic triplets accurately predicted the pyrolysis process. 619.3 °C and 5 °C/min were determined as the optimal pyrolytic temperature and heating rate. The C-containing gases were dominant among the non-condensable gases evolved from the pyrolysis. The NO precursors (NH and HCN) were found more important than NO emission in pollution control. 2,3-dihydrobenzofuran, (1-methylcyclopropyl) methanol, heptanal, acetic acid, and furfurals were the main pyrolytic by-products. BSL-derived biochar is a relatively pure carbon-rich material with extremely low N and S content. The BSL pyrolysis yielded a promising performance, as well as value-added by-products to be utilized in the fields of bioenergy, fragrance, and pharmaceuticals.
采用热重分析、傅里叶变换红外光谱和热解-气相色谱/质谱分析相结合的方法，对竹笋叶（BSL）热解的性能和反应动力学进行了研究。BSL 具有高挥发分、低灰分、N 和 S 含量的特点，使其适合于生物油的生成。BSL 热解的主要失重发生在 200 到 550°C 的挥发分阶段。BSL 中半纤维素、纤维素和木质素的热解峰值温度分别为 248.04、322.65 和 383.51°C，而通过 Starink 法估算的平均活化能分别为 144.29、175.79 和 243.02 kJ/mol。一维扩散机制（f(α)=1/(2α)）最能说明半纤维素的反应。纤维素（f(α)=0.74(1-α)[-ln(1-α)]）和木质素（f(α)=0.35(1-α)[-ln(1-α)]）反应最适合用成核机制描述。估算的动力学三要素准确预测了热解过程。619.3°C 和 5°C/min 分别被确定为最佳热解温度和加热速率。热解过程中释放的非冷凝气体以含 C 气体为主。在污染控制中，发现 NO 前体（NH 和 HCN）比 NO 排放更重要。2,3-二氢苯并呋喃、（1-甲基环丙基）甲醇、庚醛、乙酸和糠醛是主要的热解副产物。BSL 衍生的生物炭是一种相对纯净的富碳材料，其 N 和 S 含量极低。BSL 热解具有良好的性能，同时还产生了有附加值的副产物，可用于生物能源、香料和制药等领域。
