生物质碳包覆球状纳米氧化铁非等温还原动力学  

Non-isothermal reduction kinetics of biomass carbon-coated spherical iron oxide nanoparticles

作　　者：郝素菊 刘政 蒋武锋 薄荷 高一策 张玉柱 HAO Suju;LIU Zheng;JIANG Wufeng;BO He;GAO Yice;ZHANG yuzhu(School of Metallurgy and Energy,North China University of Science and Technology,Ministry of Education Key Laboratory of Modern Metallurgy Technology,Tangshan 063009,China;Department of Materials Engineering,Tangshan Vocational College of Science and Technology,Tangshan 063001,China)

机构地区：[1]华北理工大学冶金与能源学院现代冶金技术教育部重点实验室,河北唐山063009 [2]唐山科技职业技术学院材料工程系,河北唐山063001

出　　处：《粉末冶金工业》2023年第1期10-16,共7页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(51274084);河北省自然科学基金资助项目(E2022209125、E2018209323)。

摘　　要：采用水热法,以九水硝酸铁和尿素为原料成功制备出球状纳米氧化铁。以生物质葡萄糖为碳源,采用水热炭化法制备了碳包覆球状纳米氧化铁。在N2气氛下使用高温综合热分析仪测量了不同升温速率下的TG-DTA曲线,通过Flynn-Wall-Ozawa法和Coats-Redfern法相互验证确定碳包覆纳米氧化铁还原的动力学参数。结果表明:包覆生物质碳与纳米氧化铁在180℃就可以发生反应,降低了还原温度,反应活化能约为79.48 kJ/mol,反应模型为三维扩散模型。The TG-DTA curve of carbon-coated spherical nano-iron oxide in N2atmosphere was drew by high temperature comprehensive thermal analyzer.The thermogravimetric variation of carbon-coated spherical nano-iron oxide at different heating rates was analyzed.The reaction mechanism of carbon-coated spherical nano-iron oxide in N2 atmosphere was studied and its dynamic parameters were got.Ironic nitrate nonahydrate and urea were used as raw materials to control the formation of spherical nano-iron oxide by hydrothermal method,and carbonized biomass glucose by hydrothermal carbonization to prepare carbon-coated spherical nano-iron oxide.The kinetic parameters of carbon-coated spherical nano-iron oxide reduction were determined by mutual verification by Flynn-Wall-Ozawa method and Coats-Redfern method.Spherical nano-iron oxide was successfully prepared by hydrothermal method,and carbon-coated spherical nano-iron oxide was successfully prepared by hydrothermal carbonization using biomass glucose as carbon source.The reaction process of carbon-coated spherical nano-iron oxide under N2atmosphere was determined by kinetic analysis,as well as its reaction activation energy and reaction model.The results show that the reaction between coated biomass carbon and nano-iron oxide can occur at 180°C,the reduction temperature is reduced.With the increase of temperature,the CO generated by the reaction will continue to participate in the reaction,accelerating the reduction of spherical nano-iron oxide.The reaction activation energy is about 79.48 kJ/mol,and the reaction model is a three-dimensional diffusion model.

关 键 词：球状纳米氧化铁 碳包覆 还原 非等温 动力学 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ138.11[化学工程—无机化工]