LaCl_3·7H_2O晶体的热分解  

Heat Decomposition Mechanism of LaCl_3·7H_2O Crystal

作　　者：陈阳国[1] 方正[1] 唐爱东[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《稀土》2002年第1期56-58,共3页Chinese Rare Earths

基　　金：国家自然科学基金资助课题 ( 5 99740 43)

摘　　要：采用 TG- DTG方法 ,得到 L a Cl3 · n H2 O晶体在空气中热分解过程及相应分解反应的活化能 ,即在84～ 112℃时 ,L a Cl3 · 7H2 O失去 4个结晶水 ,分解反应的活化能为 133.2 k J/ mol,在 12 3.2～ 137.9℃时 ,L a Cl3 ·3H2 O失去 2个结晶水 ,分解反应的活化能为 15 3.9k J/ mol,在 16 2 .5～ 177.4℃时 ,L a Cl3 · H2 O失去 1个结晶水 ,分解反应的活化能为 45 4.6 k J/ m ol,在 397.7～ 46 4.5℃时 ,L a Cl3 气相水解为 L a OCl,活化能为 6 6 k J/ m ol。在温度低于90 0℃ (最高测试温度 )时 ,L a OCl能稳定存在。By employing thermogravimetry and differential thermal analysis method,the heat decomposition processes and corresponding activation energy of each process of LaCl 3·7H 2O in the air were obtained. From 84℃ to 112℃,LaCl 3·7H 2O loses 4 H 2O,decomposing activation energy is 133.2 kJ/mol,from 123.2℃ to 137.9℃,LaCl 3·3H 2O loses 2H 2O,decomposing activation energy is 153.9kJ/mol,from 162.5℃ to 177.4℃,LaCl 3·H 2O loses 1 H 2O,decomposing activation energy is 454.6 kJ/mol,from 397.7℃ to 464.5℃,LaCl 3 hydrolyze in gas phase and LaOCl being obtained,the react activation energy is 133.2kJ/mol.When the temperature is lower than 900℃ (the highest testing temperature),LaOCl is stable.

关 键 词：LaCl3·7H2O 热分解 活化能 氯化镧晶体 热重法 

分 类 号：O614.331[理学—无机化学]