水热法催化氧化哈密风化煤制备腐植酸的工艺研究

Study on the Preparation Technology of Humic Acid from Hami Weathered Coal by Hydrothermal Catalytic Oxidation

采用Fe2O3-V2O5二元固体酸催化剂,对哈密风化煤通过水热法催化氧化工艺制备腐植酸。通过正交实验对催化氧化工艺条件进行了优化,并且采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、热重分析(TGA)研究了Fe2O3-V2O5二元固体酸催化剂的微观结构及形貌。结果表明:在酸煤比2∶l(m L/g),反应温度100℃,反应时间0.5 h,催化剂Fe2O3-V2O5用量为2%时腐植酸产率可达73.6%,比碱溶酸析工艺处理的风化煤中腐植酸产率提高了9.6%,表明水热法催化氧化工艺能明显提高腐植酸的产率。微观结构分析表明,Fe2O3-V2O5二元固体酸催化剂结晶性较好,同时具有良好的分散性和热稳定性。

Humic acid was prepared from Hami weathered coal by the hydrothermal catalytic oxidation process with Fe2O3-V2O5 binary solid acid catalyst. Through the orthogonal experiment, the catalytic oxidation technology conditions were optimized. The microstructure and morphology of Fe2O3-V=O5 was studied by XRD, SEM, TEM and TGA. The result showed that the acid and coal ratio was 2 ： 1 （mL/g）, and the reaction temperature was 100 ℃, the reaction time was 0.5 h, and the catalyst amount of Fe2O3-V2O5 was 2%, the production rate of humic acid reached 73.6%, which was increased by 9.6% compared with alkali soluble acid analysis process. The study showed that hydrothermal catalytic oxidation process could obviously improve the production rate of humic acid. Microstructure analysis showed that Fe2O3-V2O5 binary solid acid catalyst had good crystallization properties, at the same time had good dispersion and thermal stability.