Porosity and pore size distribution of biochar from straw biomass - data for DOE
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Biochar is produced by pyrolyzing biomass in the absence of oxygen and has considerable promise as a sorbent or carbon sequestration material. Despite several investigations on biochar properties, the biochar porosity and sorption properties achieved with varied pyrolysis settings remain mostly unknown. The goal of this work was to evaluate the interrelationships between temperature, material grain size, heating rate, and retention duration, as well as the effects of these interactions on the surface morphology of wheat straw biochar. Biochars made at various pyrolytic temperatures were tested for sorption, porosity, and pore size distribution. Elemental analysis, BET-N2 surface area analysis, ICP-OES, and Fourier transform infrared spectroscopy were used to evaluate 19 wheat straw biochars produced through pyrolysis at various temperatures (500 to 700 °C), heating rates (20 and 30 °C/min), and residence periods (5 and 15 min). The best settings for wheat straw pyrolysis and the variables that have a statistically significant effect on biochar quality were established using a full factorial design technique and variance analysis. At 700 °C, with a grain size of 0.5-1.0 mm and a heating rate of 20 °C/min and a residence period of 5 minutes, a high surface area of 400 m2/g and an average pore size of roughly 2.34 nm were produced.
生物炭（Biochar）是在无氧条件下对生物质进行热解制备的材料，作为吸附剂或碳封存材料具有可观的应用前景。尽管已有诸多针对生物炭特性的研究，但不同热解工艺参数下制得的生物炭孔隙结构与吸附性能仍大多尚未明确。本研究旨在探究热解温度、原料粒径、升温速率与停留时间之间的内在关联，以及这些参数的交互作用对小麦秸秆生物炭表面形貌的影响。针对不同热解温度下制备的生物炭，本研究开展了吸附性能、孔隙结构及孔径分布测试，并采用元素分析、BET-N₂比表面积分析、电感耦合等离子体发射光谱（ICP-OES）以及傅里叶变换红外光谱（Fourier transform infrared spectroscopy），对19种分别在500~700℃热解温度、20与30℃/min升温速率、5与15min停留时间条件下制得的小麦秸秆生物炭进行表征。本研究通过全因子设计法与方差分析，确定了小麦秸秆热解的最优工艺参数，以及对生物炭品质具有统计学显著性影响的变量。当热解温度为700℃、原料粒径为0.5~1.0mm、升温速率为20℃/min且停留时间为5min时，所制备的生物炭比表面积可达400m²/g，平均孔径约为2.34nm。
