有机化工、无机化工、精细化工、化工中间体、高分子材料、催化剂、涂料、肥料及辅料、化学清洗新产品的技术服务、咨询服务；化工产品（不含易燃易爆化学危险品）的技术开发；设计、制作、代理、发布广告业务；建设项目环境影响评价；产品质量检验检测，环境检验检测，化工产品检验检测，新能源产品技术开发、技术咨询；房屋租赁；物业服务（凭许可证经营）；销售：化工产品（易燃易爆及危险化学品除外）。
This study aims to elucidate the influence of inherent minerals on nitrogen migration during the hydropyrolysis of brown coal. Such understanding holds significant importance in establishing pollution control methods for nitrogen substances in the cascade utilization of brown coal and achieving its clean and efficient utilization. The investigation specifically focuses on the hydropyrolysis of Shengli brown coal in a fixed-bed reactor under different pressures (0.1 MPa to 3 MPa). The study discusses the role of inherent minerals in the migration of coal nitrogen to various pyrolysis products, including NH3, HCN, N2, tar nitrogen, and char nitrogen, as well as the formation of nitrogen functional groups within the char. Quantitative analysis of NH3, HCN, N2, tar nitrogen, and char nitrogen is performed using an ultraviolet-visible spectrophotometer, gas chromatography, and elemental analyzer. Additionally, nitrogen functional groups in chars are detected using X-ray photoelectron spectroscopy (XPS). The results indicate that during the hydropyrolysis of Shengli brown coal, inherent minerals significantly enhance the migration of coal nitrogen to NH3 and N2. Effect of inherent minerals on migration of nitrogen from coal to HCN was affected by pyrolysis pressure, the inherent minerals obviously inhibits the conversion of coal nitrogen to HCN at 0.1 MPa，while，their influence on the migration to HCN remains negligible at pressures between 1 MPa and 3 MPa. Furthermore, inherent minerals effectively suppress the generation of char nitrogen and tar nitrogen. This is attributed to the reduction of the activation energy of coal hydropyrolysis reactions by inherent minerals, which results in more free radicals attacking nitrogen-containing heterocycles within the coal. This, in turn, leads to increased more nitrogen-containing heterocycles decomposition and transformation to NH3, N2 and HCN. Moreover, the decrease in activation energy promotes the formation of volatile matter, prolongs its separation time from the reactor, strengthens its secondary reactions, and facilitates the generation of NH3 from HCN and tar nitrogen within volatile matter. Inherent minerals in the char improve the reactivity of new char, speeding up the reaction between char and adsorbed H, which further promotes the secondary generation of NH3 and N2. These inherent minerals also facilitate the formation of pyridinic nitrogen in char while inhibiting the production of quaternary nitrogen formation. The findings of this study provide fundamental data and technical support for the development of clean and efficient brown coal utilization technologies.
