Nitrogen-containing compounds are important organic compounds that can be produced in large quantities by the nitrogen-rich pyrolysis of biomass. The aim of this study was to investigate the effect of washing pretreatment on the yield and selectivity of nitrogen-containing compounds during corn cob nitrogen-rich pyrolysis in a fixed-bed reactor. Water and organic acids were used for washes. Urea was used as the exogenous nitrogen source in nitrogen-rich pyrolysis at 500 °C. After washing pretreatment, bio-oil derived from nitrogen-rich pyrolysis had the highest yield (44.9%) and lowest water content (26.3%) and acidity. The resulting bio-oil contained a few types of compounds. Water washing improved the selectivity of pyrrole, pyridine, imidazole, and nitrile. Organic acid washing promoted the production of pyridone and imidazolinone in nitrogenous heterocyclic compounds, especially 2(1H)-pyridinone, the content of which reached 7.48%. Biochar derived from nitrogen-rich pyrolysis contained abundant nitrogenous functional groups, and the stability of biochar was optimal after washing pretreatment. Therefore, washing pretreatment could enhance the production of high-value nitrogen-containing chemicals during nitrogen-rich pyrolysis.

含氮化合物是重要的有机化合物，可以通过生物质的富氮热解大量生产。本研究的目的是研究在固定床反应器中玉米芯富氮热解过程中洗涤预处理对含氮化合物产率和选择性的影响。水和有机酸用于洗涤。500 ℃富氮热解中使用尿素作为外源氮源。经过洗涤预处理后，富氮热解得到的生物油收率最高（44.9%），含水量（26.3%）和酸度最低。得到的生物油含有几种类型的化合物。水洗提高了吡咯、吡啶、咪唑和腈的选择性。有机酸洗涤促进了含氮杂环化合物中吡啶酮和咪唑啉酮的生成，尤其是2(1H)-吡啶酮，其含量达到7.48%。富氮热解制得的生物炭含有丰富的含氮官能团，经水洗预处理后生物炭的稳定性最佳。因此，洗涤预处理可以提高富氮热解过程中高价值含氮化学品的产量。