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Thermal Characteristics of LaMnO3 Non-isothermal Synthesis Reaction

LaMnO3 비등온 합성반응의 열적특성

  • Jeon, Jong Seol (Department of Chemical Engineering, Chungnam National University) ;
  • Lee, Jung Hun (Department of Chemical Engineering, Chungnam National University) ;
  • Yoon, Chang Hyeok (Department of Chemical Engineering, Chungnam National University) ;
  • Yoo, Dong Jun (Department of Chemical Engineering, Chungnam National University) ;
  • Lim, Dae Ho (Department of Chemical Engineering, Chungnam National University) ;
  • Kang, Yong (Department of Chemical Engineering, Chungnam National University)
  • 전종설 (충남대학교 화학공학과) ;
  • 이정훈 (충남대학교 화학공학과) ;
  • 윤창혁 (충남대학교 화학공학과) ;
  • 유동준 (충남대학교 화학공학과) ;
  • 임대호 (충남대학교 화학공학과) ;
  • 강용 (충남대학교 화학공학과)
  • Received : 2016.01.05
  • Accepted : 2016.01.22
  • Published : 2016.06.01

Abstract

Thermal Characteristics and kinetic parameters of $LaMnO_3$ synthesis reaction were investigated by means of TGA (Thermogravimetric analysis) at non-isothermal heating conditions (5.0, 10.0, 15.0 and 20.0 K/min). The reaction was occurred rapidly at 450~600K (X=0.4~0.7) depending on the heating rate. Activation energy for the synthesis of $LaMnO_3$ from the precursor, which was determined by different method such as Friedman, Ozawa-Flynn-Wall and Vyazovkin methods, was in the range of 23~243 kJ/g-mol depending on the fractional conversion level and estimation method. The reaction order decreased with increasing heating rate and fractional conversional level. The average reaction order was 4.50 in case of X=0.1~0.3, while it was 1.87 in case of X=0.7~0.9, respectively. The value of frequency factor of reaction rate increased with inceasing heating rate and fractional conversion level. The aveage value of frequency factor was 205.6 ($min^{-1}$) when X=0.1~0.3, while it was 475.2 ($min^{-1}$) when X=0.7~0.9, respectively.

Acknowledgement

Supported by : 한국연구재단

References

  1. Badwal, S. P. S. and Foger, K., "Solid Oxide Electrolyte Fuel Cell Review," Ceramics Int'l. 22, 257-265(1996). https://doi.org/10.1016/0272-8842(95)00101-8
  2. Jiang, S. P., "Issues on Development of (La, Sr)$MnO_3$ Cathode for Solid Oxide Fuel Cells," J. Power. Sour., 124, 309-402(2003). https://doi.org/10.1016/S0378-7753(03)00598-6
  3. Mancic, L., Milosevic, O., Marinkovic, B., Loper S. and Riggo, F., " Rapid Formation of High Tc Phase in Bi-Pb-Sr-Ca-Cu-O System," Physica C 341-348, 503-504(2000). https://doi.org/10.1016/S0921-4534(00)00563-3
  4. Chakraborty, A., Devi, P. S. and Maiti, H. S., "Preparation of $La_{1-x}Sr_xMnO_3$ ($0{\leq}X{\leq}0.6$) Powder by Auto Ignation of Carbox-ylate-notrate Gels," Mater. Lett., 20, 63-69(1994). https://doi.org/10.1016/0167-577X(94)90149-X
  5. Chakraborty, A., Devi, P. S., Roy, S, and Maiti, H. S., "Low-temperature Synthesis of Ultrafine $La_{0.84}Sr_{0.16}MnO_3$ Powder by An Autoignition Process," J. Mater. Res., 9, 986-989(1994). https://doi.org/10.1557/JMR.1994.0986
  6. Kumar, A., Devi, P. S., Sharma, A. D. and Maiti, H. S., "A Novel Spray-pyrolysis Technique to Produce Nanocrystalline Lanthanum Strontium Manganite Powder," J. Am. Ceram. Sov., 88, 971-973(2003).
  7. Licci, F., Turilli, G., Ferro, P. and Ciccaroul, A., "Low Temperature Synthesis and Properties of $LaMnO_3{\pm}d$ and $La_{0.67}R_{0.33}MnO_3{\pm}d$ (R=Ca, Sr, Ba) from Citrate Precursors," J. Am. Ceram. Soc., 86, 413-419(2003). https://doi.org/10.1111/j.1151-2916.2003.tb03314.x
  8. Wen, T. L., Wang, D. Chem, M., Tu, H., Lu, Z., Zhang, Z., Nil, H. and Hwang, W., "Material Ressearch for Planar SOFC Stack," Solid State Ionics, 148, 513-519(2002). https://doi.org/10.1016/S0167-2738(02)00098-X
  9. Ji, J. S., Kim, C. H., Kang, Y. and Sin, K. S., "$(La_{0.8}Sr_{0.2})_{0.95}MnO_3$/Yttria A Study on the High Temperature Steam Electrolysis Using Stabilized Ziroconia Composite Electrodes," Korean Chem. Eng. Res., 43, 627-631(2005).
  10. Chakraborty, A., Devi, P. S. and Maiti, H. S., "Preparation of $La_{1-x}Sr_xMnO_3$ ($0{\leq}X{\leq}0.6$) Powder by Autoignition of Carboxylate-nitrate Gels," Mater. Lett., 20, 63-69(1994). https://doi.org/10.1016/0167-577X(94)90149-X
  11. Chakraborty, A., Devi, P. S. and Maiti, H. S., "Low Temperature Synthesis and Some Physical Properties of Barium-substituted Lanthanum Manganite ($La_{1-x}Ba_xMnO_3$)," J. Mater. Res., 10, 918-924(1995). https://doi.org/10.1557/JMR.1995.0918
  12. Friedman, H. L., "Kinetics of Thermal Degradation of Char-forming Plastics from Thermogravimetry, Application to a Phenolic Plastic," J. Poly. Sci.: Part C, 6, 183-195(1964).
  13. Kim, S. J., Lee, C. G., Song, P. S., Yun, J. S., Kang, Y., Kim, J. S. and Choi, M. J., "Characteristics of Pyrolysis and Combution Reaction of Waste Polystyrene," J. Korean Ing. Eng. Chem., 14, 634-640(2003).
  14. Pielichowski, K., "Kinetic Analysis of the Thermal Decomposition of Polyaniline," Solid State Ionics, 104, 123-132(1997). https://doi.org/10.1016/S0167-2738(97)00396-2
  15. Music, S., Dragcevic, S. and Ivanda, M., "Kinetics of Thermal Degradation in Non-isothermal Conditions of Some Phosphorus-containing Polyesters and Polyesterimides," European Poly. J., 43, 980-988(2007). https://doi.org/10.1016/j.eurpolymj.2006.12.018
  16. Kim, U. Y., Son, S. M., Kang, S. H., Kang, Y., Kim, S. D. and Jung, H., "Characteristics of Stream Gasification and Combustion of Naphtha Tar Pitch," Korean Chem. Eng. Res., 45, 604-610(2007).
  17. Vyazovkin, S. and Wight, C. A., "Isothermal and Non-isothermal Kinetics of Thermally Stimulated Reactions of Solids," Int'l. Rev. phy. Chem., 17, 407-433(1998). https://doi.org/10.1080/014423598230108
  18. Vyazovkin, S. and Wight, C. A., "Model-free and Model-fitting Approaches to Kinetic Analysis of Isothermal and Nonisothermal Data," Thermochimica Acta, 340-341, 53-68(1999). https://doi.org/10.1016/S0040-6031(99)00253-1
  19. Park, S. W. and Jang, C. H., "Assessment of Combustion Characteristics of Carbonized Sludge Using Non-isothermal Thermogravimetric Analysis," J. Korea Society of Waste Managment., 27, 422-430(2010).