State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2019 Oct;290:121739. doi: 10.1016/j.biortech.2019.121739. Epub 2019 Jul 2.
To explore fast pyrolysis behaviors of cedar biomass, the infrared heating technique with quick heating rate was taken in a fixed-bed reactor. The effects of heating rates (5-30 °C/s) and pyrolysis temperatures (400-600 °C) on pyrolysis products distribution and compositions were discussed, and the reaction mechanism was proposed. The results show that high heating rate can significantly suppress secondary reaction of primary volatiles. GC/FID and GC/MS analyses indicate that higher heating rate is favorable to the generation of glucose derivatives such as acids and furans. However, higher temperature can obviously promote further conversion of guaiacyl-contained structure following demethylation, demethoxylation and H/CH assisted demethoxylation routes, which were proposed to interpret the formation of biphenolic hydroxyl and monophenolic hydroxyl compounds such as phenol, 2-methyl-phenol and 2,4-dimethyl-phenol, respectively. Moreover, the demethylation route exhibits obvious conversion advantage at higher temperature due to lower energy barrier.
为了探究雪松生物质的快速热解行为，在固定床反应器中采用了快速升温的红外加热技术。讨论了升温速率（5-30°C/s）和热解温度（400-600°C）对热解产物分布和组成的影响，并提出了反应机理。结果表明，高升温速率可以显著抑制一次挥发物的二次反应。GC/FID 和 GC/MS 分析表明，较高的升温速率有利于生成葡萄糖衍生物，如酸和呋喃。然而，较高的温度可以明显促进愈创木基结构在脱甲基、脱甲氧基和 H/CH 辅助脱甲氧基途径后的进一步转化，提出了这一途径来解释双酚羟基和单酚羟基化合物如苯酚、2-甲基苯酚和 2,4-二甲基苯酚的形成，分别。此外，由于能垒较低，脱甲基途径在较高温度下表现出明显的转化优势。
