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| Non-isothermal reduction kinetics of biomass carbon-coated spherical iron oxide nanoparticles |
| HAO Suju1，LIU Zheng1，JIANG Wufeng1，BO He2，GAO Yice1，ZHANG yuzhu1 |
| （1. School of Metallurgy and Energy, North China University of Science and Technology, Ministry of Education
Key Laboratory of Modern Metallurgy Technology, Tangshan 063009, China;2. Department of Materials Engineering,
Tangshan Vocational College of Science and Technology, Tangshan 063001, China） |
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Abstract The TG-DTA curve of carbon-coated spherical nano-iron oxide in N2 atmosphere 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 N2 atmosphere
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.
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Received: 06 April 2022
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Corresponding Authors:
蒋武锋（1966—），男，博士，教授，主要研究方向为钢铁冶金及纳米材料制备。
薄荷（1983—），女，硕士，副教授，主要研究方向为钢铁冶金方面研究。
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2023, Vol. 33 
