基于热失重法的CO还原NiO粉末反应动力学研究  

Research on reaction kinetics of NiO powder reduction reaction with CO based on thermogravimetric analysis

作　　者：屈彦杰 钟武烨 郑剑平[1] 郭志猛 QU Yanjie;ZHONG Wuye;ZHENG Jianping;GUO Zhimeng(China Institute of Atomic Energy,Beijing 102413,China;Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Bcijing 100083,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《粉末冶金工业》2021年第2期17-22,共6页Powder Metallurgy Industry

摘　　要：采用热失重方法对两种粒径的NiO粉末与不同CO2/CO气体比例的反应动力学进行研究,结合反应后NiO粉末的积碳特性表征,对NiO的转化率进行讨论。研究发现:NiO与CO反应的起始温度为420℃;随温度的升高,反应速度加快且转化率提高。NiO粉末颗粒外表的积碳是影响NiO转化率的重要因素,使反应从化学反应控制转化为扩散控制;降低CO的浓度可有效降低积碳过程对转换率的影响。Reaction kinetics between NiO powder with two different particle sizes and mixed gas with different CO2/CO proportion was researched based on thermogravimetric analysis. And the conversion of NiO was discussed by carbon deposition characteristic of NiO powder before and after reaction. It was found that the initial temperature for NiOpowder reduction reaction with CO was 420 ℃, and the reaction rate and conversion of NiO increased with higher temperature. Carbon deposition of NiO powder influence the conversion of NiO badly, which make reaction transfer from chemical reaction control to diffusion control. And reducing the concentration of CO can reduce the influence that carbon deposition acts to conversion.

关 键 词：氧化镍 载氧体 热失重法 积碳 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TL411[金属学及工艺—金属学]