School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.
School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.
Bioresour Technol. 2022 Jan;343:126145. doi: 10.1016/j.biortech.2021.126145. Epub 2021 Oct 18.
In this study, nitrogen-containing chemicals and nitrogen-rich biochar were prepared using ammonia (NH) torrefaction pretreatment technology. The effects of temperature and duration of torrefaction on the characteristics of torrefaction and pyrolysis products were evaluated. The results indicated that when the torrefaction temperature was increased to 290 °C, the nitrogen content increased significantly from 0.98% to 6.85%. XPS analysis showed that the raw biomass mainly contained amide-N and pyrrole-N. As the torrefaction temperature and duration increased, quaternary-N formation was promoted, while amide-N, pyrrole-N, and pyridine-N were consumed. Potential nitrogen doping and transformation pathways during the ammonia torrefaction process were proposed. GC-MS analysis showed that ammonia torrefaction promoted the formation of pyridines, while reducing the content of oxygen-containing species. In addition, torrefaction duration had positive effects on the yield of nitrogen-containing chemicals.
在这项研究中，采用氨（NH）热解预处理技术制备了含氮化学品和富氮生物炭。评估了热解温度和时间对热解和热解产物特性的影响。结果表明，当热解温度升高到 290°C 时，氮含量从 0.98%显著增加到 6.85%。XPS 分析表明，原料生物质主要含有酰胺-N 和吡咯-N。随着热解温度和时间的增加，促进了季氮的形成，而酰胺-N、吡咯-N 和吡啶-N 被消耗。提出了在氨热解过程中潜在的氮掺杂和转化途径。GC-MS 分析表明，氨热解促进了吡啶的形成，同时降低了含氧物种的含量。此外，热解时间对含氮化学品的产率有积极影响。
