Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (09): 1001-1005.doi: 10.3866/PKU.WHXB20050912

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Thermodynamics and Thermal Analysis Kinetics of MC2O4 (M=Mn, Fe, Co, Ni, Cu, Zn)

SHAN Hai-wei CHEN Dong-hua TANG Wan-jun   

  1. Hubei Key Laboratory for Catalysis and Material Science, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074
  • Received:2005-01-17 Revised:2005-03-17 Published:2005-09-15
  • Contact: CHEN Dong-hua

Abstract: Thermodynamics and Kinetics of MC2O4 (M=Mn, Fe, Co, Ni, Cu, Zn) were studied in N2 or O2 using DSC and TGA techniques. In N2, the dehydration temprature Tde and enthalpy of dehydration ΔdeHm show “Two Group Domino Effect” along with atomic number Zre;ΔdeHm fluctuates in the range of (96.46±7.00) kJ•mol-1;the decomposition temperature Td of MC2O4•2H2O (M=Mn, Fe, Ni) and enthalpy have very good linearity along with atomic number Zre. When forming oxide MO in oxygen, decomposition enthalpy of MC2O4 (M=Co, Ni, Cu) shows a beeline along with atomic number Zre. All the reactions, except the dehydration of NiC2O4•2H2O and the decomposition FeC2O4, belong to the same mechanism of random nucleation and growth, with integral form , and differential form .

Key words: DSC, TG, Oxalate, Transition elements, Atom number, Thermodynamics, Thermal analysis kinetics