稀土乙酸配合物热稳定性的研究  

Study on The Thermostability of Lanthanide Acetate

作　　者：倪兆艾[1] 徐诚[1] 朱凤军[1] 马向红[1] 蒋优丰 郑东有 

机构地区：[1]杭州大学化学系

出　　处：《杭州大学学报（自然科学版）》1993年第2期199-203,共5页Journal of Hangzhou University Natural Science Edition

摘　　要：本文以程序升温分解气相色谱法为主要手段,系统研究了十五个稀土乙酸配合物在氢气气氛中的热稳定性.根据色谱所检测到的气体分解产物及相应的出峰温度,得知热分解过程中主要释放出二氧化碳,其次是丙酮和一氧化碳,高温时还伴有少量水生成,以释放二氧化碳的峰值温度对稀土原子序数作图其图形与“双双效应”相仿.本文还对负载型稀土乙酸配合物的热稳定性作了研究,考察了载体的酸碱性、负载比等对配合物热稳定性的影响.Thermostability of 15 Lanthanide acetates under H2 atmosphere was studied by the temperature programmed decomposition and the gas chroma-tography (TPD-GC) method. The thermal decomposition style of Ln(CH3COO)3 is similar, but it has some difference for light and heavy rare earth acetates. From the elutipn curve of decomposition products the first product is CO2 followed by acetone, at higher temperature it produces CO and H2O. There is some carbon on the residue. The CO2 peak of La-Nd is a double peak, but for Sm-Lu it changes into a single peak. Experimental results show the decompositon behavior is related to its crystal structure. If we take the max. temperature of CO2 peak VS the atomic number of lanthanide, it shows similar 'Double-Double' effect. We have studied the effect of the supports on the decomposition of lanthanide acetates. The supports are SiO2, γ-Al2O3, MgO, SrO and BaO. The acidity of the supports greatly influences the thermostability and decomposition path of lanthanide acetates.

关 键 词：热稳定法 稀土金属 乙酸 络合物 

分 类 号：O614.33[理学—无机化学]