Venegas-Vásconez Diego, Arteaga-Pérez Luis E, Aguayo María Graciela, Romero-Carrillo Romina, Guerrero Víctor H, Tipanluisa-Sarchi Luis, Alejandro-Martín Serguei
Departamento de Ingeniería de Maderas, Universidad del Bío-Bío, Concepción 4081112, Chile.
Laboratorio de Cromatografía Gaseosa y Pirólisis Analítica, Universiad del Bío-Bío, Concepción 4081112, Chile.
Polymers (Basel). 2023 Sep 17;15(18):3790. doi: 10.3390/polym15183790.
(PR) and (EG) are the most planted species in Chile. This research aims to evaluate the pyrolysis behaviour of PR and EG from the Bío Bío region in Chile. Biomass samples were subjected to microwave pretreatment considering power (259, 462, 595, and 700 W) and time (1, 2, 3, and 5 min). The maximum temperature reached was 147.69 °C for PR and 130.71 °C for EG in the 700 W-5 min condition, which caused the rearrangement of the cellulose crystalline chains through vibration and an increase in the internal energy of the biomass and the decomposition of lignin due to reaching its glass transition temperature. Thermogravimetric analysis revealed an activation energy (E) reduction from 201.71 to 174.91 kJ·mol in PR and from 174.80 to 158.51 kJ·mol in EG, compared to the untreated condition (WOT) for the 700 W-5 min condition, which indicates that microwave pretreatment improves the activity of the components and the decomposition of structural compounds for subsequent pyrolysis. Functional groups were identified by Fourier transform infrared spectroscopy (FTIR). A decrease in oxygenated compounds such as acids (from 21.97 to 17.34% w·w and from 27.72 to 24.13% w·w) and phenols (from 34.41 to 31.95% w·w and from 21.73 to 20.24% w·w) in PR and EG, respectively, was observed in comparison to the WOT for the 700 W-5 min condition, after analytical pyrolysis. Such results demonstrate the positive influence of the pretreatment on the reduction in oxygenated compounds obtained from biomass pyrolysis.
辐射松（PR）和桉木（EG）是智利种植最多的树种。本研究旨在评估智利比奥比奥地区辐射松和桉木的热解行为。考虑功率（259、462、595和700瓦）和时间（1、2、3和5分钟）对生物质样品进行微波预处理。在700瓦-5分钟的条件下，辐射松达到的最高温度为147.69℃，桉木为130.71℃，这通过振动导致纤维素结晶链重排，生物质内能增加，并且由于达到玻璃化转变温度导致木质素分解。热重分析表明，与700瓦-5分钟条件下的未处理状态（WOT）相比，辐射松的活化能（E）从201.71千焦·摩尔降至174.91千焦·摩尔，桉木从174.80千焦·摩尔降至158.51千焦·摩尔，这表明微波预处理提高了各组分的活性以及后续热解中结构化合物的分解。通过傅里叶变换红外光谱（FTIR）鉴定官能团。在700瓦-5分钟条件下进行分析热解后，与WOT相比，辐射松和桉木中的含氧化合物如酸（分别从21.97%重量比降至17.34%重量比和从27.72%重量比降至24.13%重量比）和酚（分别从34.41%重量比降至31.95%重量比和从21.73%重量比降至20.24%重量比）减少。这些结果证明了预处理对生物质热解所得含氧化合物减少的积极影响。
