Comparison of the dehydration kinetics of solid state compounds of 2-methoxybenzylidenepyruvate with some divalent metal ions
Article Sidebar
Main Article Content
Abstract
Divalent metal complexes of ligand 2-methoxybenzylidenepyruvate with Fe, Co, Ni, Cu and Zn as well as sodium salt were synthesized and investigated in the solid state. TG curves of these compounds were obtained with masses sample of 1 and 5mg under nitrogen atmosphere. Different heating rates were used to characterize and study these compounds from the kinetic point of view. The activation energy and pre-exponential factor were obtained applying the Wall-Flynn-Ozawa method to the TG curves. The obtained data were evaluated and the values of activation energy (Ea / kJ mol-1) was plotted in function of the conversion degree (α). The results show that due to mass sample, different activation energies were obtained. The results are discussed mainly taking into account the linear dependence between the activation energy and the pre exponential factor, where was verified the effect of kinetic compensation (KCE) and possible linear relations between the dehydrations steps of these compounds.
Metrics
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
The corresponding author transfers the copyright of the submitted manuscript and all its versions to Eclet. Quim., after having the consent of all authors, which ceases if the manuscript is rejected or withdrawn during the review process.
When a published manuscript in EQJ is also published in other journal, it will be immediately withdrawn from EQ and the authors informed of the Editor decision.
Self-archive to institutional, thematic repositories or personal webpage is permitted just after publication. The articles published by Eclet. Quim. are licensed under the Creative Commons Attribution 4.0 International License.
References
Reimer, M. and Howard. M. J. Am. Chem. Soc. 50 (1928)m 2506.
Kobelnik, M.; Schnitzler, E.; Ionashiro, M. J. Therm. Anal. Cal. 91 (2008) 891.
Fernandes, N. S.; Carvalho Filho, M. A. S.; Mélios, C. B.; Ionashiro, M. J. Therm. Anal. Cal. 59 (2000) 663.
Fernandes, N. S.; Carvalho Filho, M. A. S.; Mélios, C. B.; Ionashiro, M. J. Therm. Anal. Cal 73 (2003) 307.
N. S. Fernandes, S. A. Araujo, M. Ionashiro, Ecl. Quím. 31(2) (2006) 39.
Fernandes, N. S.; Carvalho Filho, M. A. S.; Mendes, R. A.; Mélios, C. B.; Ionashiro, M. J. Therm. Anal. Cal. 76 (2004) 193.
A. B. Siqueira, C. T. de Carvalho, E. C. Rodrigues, E. Y. Ionashiro, G. Bannach, M. Ionashiro, Ecl. Quím 32(4) (2007) 49-54.
Ionashiro, E. Y.; Fertonani, F. L.; Mélios, C. B.; Ionashiro, M. J. Therm. Anal. Cal. 79 (2005) 299.
Bannach, G.; Schnitzler, E.; Mélios, C. B.; Ionashiro, M. Ecl. Quim. 29 (2004) 31.
Souza JL, Kobelnik M, Ribeiro CA, Capela JMV. Kinetics study of crystallization of PHB in presence of hydrociacids. J. Therm. Anal. Cal. 97 (2009) 525.
Flynn, J. H.; Wall, J. Nat. Bur. Stand. 70A (1966) 487.
Ozawa, T. Bull. Chem. Soc. Jpn. 38 (1965) 1881.
Ozawa, T. J. Therm. Anal. 2 (1970) 301.
Chen, D.; Gao, X.; Dollimore, D. A. Thermochim. Acta 215 (1993) 109.
Málek, J. Criado, J. M., Sestak, J., Militky, J. Thermochim. Acta 153 (1989) 429.
Vyazovkin, S.; Wight, C. A. Int. Rev. Phys. Chem. 17 (1998) 407.
Flynn, J.H.; Wall, L. A. J. Polymer Sci., Pt. B., 4 (1966) 323.
C.D. Doyle, J. Appl. Polymer Sci. 5 (1961) 285.
Kobelnik, M.; Bernabé, G. A.; Ribeiro, C. A.; Capela, J. M. V.; Fertonani, F. L. J. Therm. Anal. Calorim. 97 (2009) 493.
Galwey A. K.; Brown M. E. Thermal Decompositions of Ionic Solids. 1th ed. Amsterdan: Elsevier; 1999.
Galwey A. K. Thermochim. Acta. 2004,413,139.
Prasad, T. P.; Kanungo, S. B.; Ray, H. S. Thermochim. Acta. 2002,203,503.
N. Koga, J. Sestak. J. Therm. Anal. 37 (1991) 1103.
N. Koga. Thermochim. Acta 244 (1994) 1.
J. Zsakó. J. Therm. Anal. Cal. 47 (1996) 1679.
J. G. R. Poço; H., Furlan; R., Giudici. Journal Physical Chemical B 106 (2002) 4873.