The complex of [La 2(P MBA) 6(PHEN) 2]2H 2O (P MBA: p methylbenzoate and PHEN: 1,10 phenanthroline) was prepared and characterized by elemental analysis and IR spectroscopy. The thermal behavior of [La 2(P M...The complex of [La 2(P MBA) 6(PHEN) 2]2H 2O (P MBA: p methylbenzoate and PHEN: 1,10 phenanthroline) was prepared and characterized by elemental analysis and IR spectroscopy. The thermal behavior of [La 2(P MBA) 6(PHEN) 2]2H 2O in dynamic nitrogen atmosphere was investigated by TG DTG techniques. The results show that the thermal decomposition process of the [La 2(P MBA) 6(PHEN) 2]2H 2O occurs in five steps. The empirical kinetic model for the first step thermal decomposition obtained by Malek method is SB(m,n). The activation energy E and the pre exponential factor lnA for this step reaction are 76.4 kJ·mol -1 and 24.92, respectively.展开更多
The thermal decomposition of the strontium chloride hexahydrate and its kinetics were studied under non isothermal condition in nitrogen by thermogravimetric and derivative thermogravimetric techniques. The intermedi...The thermal decomposition of the strontium chloride hexahydrate and its kinetics were studied under non isothermal condition in nitrogen by thermogravimetric and derivative thermogravimetric techniques. The intermediate and residue for each decomposition were identified from TG curve. The non isothermal kinetic data were analyzed by the Achar method and the Coats Redfern method. The possible reaction mechanisms were suggested by comparing the kinetic parameters. The kinetic equation for the first stage can be expressed as d α /d t = A exp(- E/RT)(1-α ), the second stage, d α /d t = A exp(- E/RT)3(1-α ) 2/3 , and the third stage, d α /d t = A exp(- E/RT)3/2(1-α ) 2/3 [1-(1- α ) 1/3 ] -1 . Mathematic expressions of the kinetic compensation effects of each stage of the thermal decomposition reaction were also obtained.展开更多
The thermal decomposition of [Eu 2( p MOBA) 6(phen) 2](H 2O) 2 ( p MOBA=C 8H 7O 3, methoxybenzoate; phen=C 12 H 8N 2, 1,10 phenanthroline) and its kinetics were studied under the non isothermal...The thermal decomposition of [Eu 2( p MOBA) 6(phen) 2](H 2O) 2 ( p MOBA=C 8H 7O 3, methoxybenzoate; phen=C 12 H 8N 2, 1,10 phenanthroline) and its kinetics were studied under the non isothermal condition in air by TG and DTG methods. The intermediate and residue for each decomposition were identified from TG curve. The non isothermal kinetic data were analyzed by the Achar method and Coats Redfern method. The possible reaction mechanisms were suggested by comparing the kinetic parameters. The kinetic equation for the first stage can be expressed as d α /d t = A exp(- E/RT )[-ln(1- α )] -1 , the second stage and the third stage d α /d t = A exp(- E/RT )3/2(1- α ) 4/3 [1/(1- α ) 1/3 -1] -1 . The mathematical expressions of the kinetic compensation effects of each stage of the thermal decomposition reaction were also obtained.展开更多
The pyruvic acid salicylhydrazone and its new complex of Pr(III) were synthesized. The formulae C 10 H 10 N 2O 4 (mark as H 3L) and [Pr 2(L) 2(H 2O) 2]·3H 2O (L=the triad form of the pyruvic acid...The pyruvic acid salicylhydrazone and its new complex of Pr(III) were synthesized. The formulae C 10 H 10 N 2O 4 (mark as H 3L) and [Pr 2(L) 2(H 2O) 2]·3H 2O (L=the triad form of the pyruvic acid salicylhydrazone [C 10 H 7N 2O 4] 3- ) were determined by elemental and EDTA volumetric analysis. Molar conductance, IR, UV, X ray and 1H NMR were carried out for the characterizations of the complex and the ligand. The thermal decompositions of the ligand and the complex with the kinetic study were carried out by non isothermal thermogravimetry. The Kissinger's method and Ozawa's method are used to calculate the activation energy value of the main step decomposition. The stages of the decompositions were identified by TG DTG DSC curve. The non isothermal kinetic data were analyzed by means of integral and differential methods. The possible reaction mechanism and the kinetic equation were investigated by comparing the kinetic parameters.展开更多
文摘The complex of [La 2(P MBA) 6(PHEN) 2]2H 2O (P MBA: p methylbenzoate and PHEN: 1,10 phenanthroline) was prepared and characterized by elemental analysis and IR spectroscopy. The thermal behavior of [La 2(P MBA) 6(PHEN) 2]2H 2O in dynamic nitrogen atmosphere was investigated by TG DTG techniques. The results show that the thermal decomposition process of the [La 2(P MBA) 6(PHEN) 2]2H 2O occurs in five steps. The empirical kinetic model for the first step thermal decomposition obtained by Malek method is SB(m,n). The activation energy E and the pre exponential factor lnA for this step reaction are 76.4 kJ·mol -1 and 24.92, respectively.
文摘The thermal decomposition of the strontium chloride hexahydrate and its kinetics were studied under non isothermal condition in nitrogen by thermogravimetric and derivative thermogravimetric techniques. The intermediate and residue for each decomposition were identified from TG curve. The non isothermal kinetic data were analyzed by the Achar method and the Coats Redfern method. The possible reaction mechanisms were suggested by comparing the kinetic parameters. The kinetic equation for the first stage can be expressed as d α /d t = A exp(- E/RT)(1-α ), the second stage, d α /d t = A exp(- E/RT)3(1-α ) 2/3 , and the third stage, d α /d t = A exp(- E/RT)3/2(1-α ) 2/3 [1-(1- α ) 1/3 ] -1 . Mathematic expressions of the kinetic compensation effects of each stage of the thermal decomposition reaction were also obtained.
文摘The thermal decomposition of [Eu 2( p MOBA) 6(phen) 2](H 2O) 2 ( p MOBA=C 8H 7O 3, methoxybenzoate; phen=C 12 H 8N 2, 1,10 phenanthroline) and its kinetics were studied under the non isothermal condition in air by TG and DTG methods. The intermediate and residue for each decomposition were identified from TG curve. The non isothermal kinetic data were analyzed by the Achar method and Coats Redfern method. The possible reaction mechanisms were suggested by comparing the kinetic parameters. The kinetic equation for the first stage can be expressed as d α /d t = A exp(- E/RT )[-ln(1- α )] -1 , the second stage and the third stage d α /d t = A exp(- E/RT )3/2(1- α ) 4/3 [1/(1- α ) 1/3 -1] -1 . The mathematical expressions of the kinetic compensation effects of each stage of the thermal decomposition reaction were also obtained.
基金ProjectsupportedbytheNaturalScienceFoundationofShaanxiProvince (No .98H0 10 )andStateKeyLaboratoryofRareEarthMaterialsChemistryandApplication&PekingUniversity .
文摘The pyruvic acid salicylhydrazone and its new complex of Pr(III) were synthesized. The formulae C 10 H 10 N 2O 4 (mark as H 3L) and [Pr 2(L) 2(H 2O) 2]·3H 2O (L=the triad form of the pyruvic acid salicylhydrazone [C 10 H 7N 2O 4] 3- ) were determined by elemental and EDTA volumetric analysis. Molar conductance, IR, UV, X ray and 1H NMR were carried out for the characterizations of the complex and the ligand. The thermal decompositions of the ligand and the complex with the kinetic study were carried out by non isothermal thermogravimetry. The Kissinger's method and Ozawa's method are used to calculate the activation energy value of the main step decomposition. The stages of the decompositions were identified by TG DTG DSC curve. The non isothermal kinetic data were analyzed by means of integral and differential methods. The possible reaction mechanism and the kinetic equation were investigated by comparing the kinetic parameters.
