一步法合成碳氮化钒的动力学研究
于三三[1,2] 付念新[1] 高峰[1] 隋智通[1]
[1]东北大学材料冶金学院冶金物理化学系,辽宁沈阳110004 [2]沈阳化工学院化工系,辽宁沈阳110142
摘 要:
通过三氧化二钒和碳的热重实验,发现三氧化二钒的碳热还原氮化过程可分为两个不同的反应阶段。反应过程存在多个吸热反应,并且不同的反应存在相当程度的重合。根据TG/DTG曲线,通过动力学分析方法得出三氧化二钒的碳热还原氮化反应的不同阶段的反应表观活化能Ea(1170-1340 K:Ea=205.46 kJ.mol-1;1340-1410 K:Ea=465.27 kJ.mol-1)、频率因子A及动力学速率方程,反应符合反应控制机制(Rn模型)。[著者文摘]
文章出处:
《稀有金属》-2008年32卷1期 -84-87页
栏目信息:
文献标识码:
A
文章编号:
0258-7076(2008)01-0084-04
Chemical Kinetics of Synthesizing Vanadium Carbonitride by One Step Method
Yu Sansan;Fu Nianxin;Gao Feng;Sui Zhitong (1.School of Materials and Metallurgy;Northeastern University;Shenyang 110006;China;2.Department of Chemical Engineering;Shenyang Institute of Chemical Technology;Shenyang 110142;China)
Abstract:
By the thermal gravimetric experiment,reaction courses were analyzed.It was found that the process of preparing vanadium carbonitride was a blended process of three endothermic reactions.Basis on TG/DTG curves,the apparent activation energy Ea(namely,1170~1340 K: Ea=205.46 kJ·mol-1;1340~1410 K: Ea=465.27 kJ·mol-1),frequency factor A and reaction kinetic rate equation of the reaction were obtained via dynamics analyzing method,and the reaction followed Rn model.[著者文摘]
Key words:
vanadium carbonitride;apparent activation energy;vanadium trioxide;nitriding;carbothermal reduction

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