Abstract This work demonstrated that supercritical carbon dioxide extraction is effective as a pre-treatment technology to generate soot particles with the fullerene-like structure and increase syngas yield from extracted residues during coupled microwave activation with gasification. Supercritical carbon dioxide extraction removes over half of the fatty and resin acids from needles and branches, whereas the extraction of needles generates greater yields of value-added compounds. The high yields of extractives indicate the effective conversion of waste wood for the sustainable production of value-added chemicals. The wood extraction did not influence the solid residue yields during pyrolysis/gasification emphasizing the significant potential of integrating the extraction process into the holistic biorefinery. Interestingly, supercritical carbon dioxide extraction had a significant effect on the structure and quality of soot particles formed. The differences in the extractives composition led to the formation of needle soot particles with a porous and less ordered nanostructure, whereas the soot branches obtained a ring graphitic structure. The greater yields of steroids and terpenes during the extraction of needles compared to the branches pretreatment indicated the influence of the extractives type on the soot nanostructure.

中文翻译：

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木材废料的超临界萃取和微波活化，以提高合成气生产和富勒烯类烟尘颗粒的生成

摘要 这项工作表明，超临界二氧化碳萃取作为一种预处理技术是有效的，可在微波活化与气化耦合过程中产生具有类富勒烯结构的烟灰颗粒并提高萃取残留物的合成气产率。超临界二氧化碳萃取可从针叶和枝条中去除一半以上的脂肪酸和树脂酸，而针叶萃取可产生更高产量的增值化合物。提取物的高产量表明可以有效地将废木材转化为可持续生产增值化学品。木材提取不会影响热解/气化过程中的固体残留物产量，这强调了将提取过程整合到整体生物精炼中的巨大潜力。有趣的是，超临界二氧化碳萃取对形成的烟尘颗粒的结构和质量有显着影响。提取物组成的差异导致形成具有多孔和不太有序的纳米结构的针状烟灰颗粒，而烟灰分支获得环状石墨结构。与分支预处理相比，针提取过程中类固醇​​和萜烯的产量更高，表明提取物类型对烟尘纳米结构的影响。