Sun Zhengshuai, Yao Dingding, Guo Huang, Zhu Haodong, Hua Wenbin, Yuan Qiaoxia, Zhang Liqi, Fan Qizhou, Yi Baojun
College of Engineering, Huazhong Agricultural University, No. 1, Shizishan Street, Hongshan District, Wuhan, 430070, PR China.
College of Engineering, Huazhong Agricultural University, No. 1, Shizishan Street, Hongshan District, Wuhan, 430070, PR China; Key Laboratory of Smart Farming for Agricultural Animals, Wuhan, 430070, PR China.
J Environ Manage. 2023 Jun 15;336:117710. doi: 10.1016/j.jenvman.2023.117710. Epub 2023 Mar 13.
Nitrogen, as a common element, is widely present in biomass. The effects of nitrogenous substances on the same origin pyrolysis of biomass and the consequences of N-containing biochar on the catalytic process of volatiles are important for further analyzing the pyrolysis mechanism of biomass. In this research, N-containing biochar was prepared under different conditions, and the interaction between N-containing biochar and biomass pyrolysis volatiles at 400-700 °C was studied. The results show that N-containing biochar can simultaneously participate in reactions as adsorbents, catalysts, and reactants. Its catalytic effect is obviously different for various N configurations. Pyridinic N and pyrrolic N can promote the cracking of lignin into methoxy phenol compounds and promote the further cracking of 5-hydroxymethylfurfural. Graphitic N and oxidized N can promote the further decomposition of phenol and the conversion of D-xylose into small-molecule ketones. In addition, oxidized N can also inhibit the cracking of lignin to produce guaiacol. In the long-term interaction, the highly active pyridinic N tends to convert to a more stable graphitic N.
氮作为一种常见元素，广泛存在于生物质中。含氮物质对生物质同一起源热解的影响以及含氮生物炭对挥发分催化过程的影响，对于进一步分析生物质热解机理具有重要意义。本研究在不同条件下制备了含氮生物炭，并研究了400 - 700℃下含氮生物炭与生物质热解挥发分之间的相互作用。结果表明，含氮生物炭可同时作为吸附剂、催化剂和反应物参与反应。其对不同氮构型的催化效果明显不同。吡啶氮和吡咯氮可促进木质素裂解为甲氧基苯酚类化合物，并促进5-羟甲基糠醛的进一步裂解。石墨氮和氧化氮可促进苯酚的进一步分解以及D-木糖转化为小分子酮。此外，氧化氮还可抑制木质素裂解生成愈创木酚。在长期相互作用中，高活性的吡啶氮倾向于转化为更稳定的石墨氮。
