Mn(Ⅱ)催化硝酸氧化草酸反应动力学及机理分析  

MN(II)-catalyzed oxidation of oxalic chemical kinetics with nitric acid and its mechanism

作　　者：倪自鹏 Ni Zipeng(Shandong Hualu-Hengsheng Chemical Co.,Ltd,Dezhou Shandong 253000)

机构地区：[1]山东华鲁恒升化工股份有限公司,山东德州253000

出　　处：《石化技术》2023年第3期57-59,共3页Petrochemical Industry Technology

摘　　要：硝酸体系内以草酸为还原剂,以Mn^(2+)离子为催化剂,对Mn(Ⅱ)催化硝酸氧化草酸反应进行动力学研究,掌握其中的反应机理。分析草酸与硝酸浓度对反应过程造成的影响,得出初始动力学速率情况,判断Mn^(2+)离子与亚硝酸钠的浓度对反应速率产生的影响。经过研究得知:Mn^(2+)离子浓度在达到0.02mol/L时,Mn^(2+)的反应级数是0.6742。由此可见,Mn^(2+)离子和亚硝酸钠浓度的提高会促进草酸的消耗,提高草酸消耗速度,缩短草酸分解时间,关于该实验的反应机理,即Mn^(2+)离子促进亚硝酸生成,亚硝酸和草酸的氧化还原反应能够推动草酸的进一步分解,发挥草酸与Mn^(2+)离子的还原剂与催化剂应用作用。In the nitric acid system,oxalic acid was used as reducing agent,and MN(II)was used as catalyst for the oxidation of oxalic acid by nitric acid.The effect of the concentration of oxalic acid and nitric acid on the reaction rate was analyzed,and the initial kinetic rate was obtained.The effect of the concentration of MN^(2+)ions and Sodium Nitrite on the reaction rate was estimated.It was found that the reaction order of MN^(2+)was 0.6742 when the concentration of MN^(2+)ion was between 0.008 and 0.02 mol/L.Thus,the increase of MN^(2+)ion and Sodium Nitrite concentration would promote the consumption of oxalic acid,increasing the rate of oxalic acid consumption and shortening the decomposition time of oxalic acid,the reaction mechanism of this experiment is that MN^(2+)ions promote the formation of nitrite,and the redox of nitrite and oxalic acid can promote the further decomposition of oxalic acid,application of reductant and catalyst of oxalic acid and MN^(2+)Ion.

关 键 词：Mn^(2+)离子 草酸 硝酸 氧化还原 催化剂 

分 类 号：TL24[核科学技术—核燃料循环与材料] O643.36[理学—物理化学] O643.1[理学—化学]