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Licensed Unlicensed Requires Authentication Published by De Gruyter August 1, 2007

Mechanism of thermal decomposition of cobalt acetate tetrahydrate

  • T. Wanjun EMAIL logo and C. Donghua
From the journal Chemical Papers

Abstract

The thermal decomposition of cobalt acetate tetrahydrate (Co(CH3COO)2 · 4H2O) has been studied via thermogravimetric (TG) analysis, in situ X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results of TG and XRD showed that the parent salt melted and then the dissolved crystalline water was vaporized in two steps. The dehydration process was followed by a major step concerning the decomposition of the acetate group, leading to basic acetate as an intermediate, which then produced CoO and Co in N2 and H2 atmosphere, respectively. Three decomposition intermediates Co(CH3COO)2 · 0.5H2O, Co(CH3COO)2, and Co(OH)(CH3COO) were presumed. In situ XRD experiments revealed that the intermediate basic acetate was poorly crystallized or even amorphous. Evolved gases analysis indicated that the volatile products of acetate decomposition were water vapor, acetic acid, ethylenone, acetone, and CO2. A detailed thermal decomposition mechanism of Co(CH3COO)2 · 4H2O was discussed.

[1] Bowker, M. and Cassidy, T. J., J. Catal. 174, 65 (1998). http://dx.doi.org/10.1006/jcat.1997.195810.1006/jcat.1997.1958Search in Google Scholar

[2] Sarellas, A., Niakolas, D., Bourikas, K., Vakros, J., and Kordulis, C., J. Colloid Interface Sci. 295, 165 (2006). http://dx.doi.org/10.1016/j.jcis.2005.08.02010.1016/j.jcis.2005.08.020Search in Google Scholar

[3] Raróg-Pilecka, W., Miskiewicz, E., Matyszek, M., Kaszkur, Z., Kepinski, L., and Kowalczyk, Z., J. Catal. 237, 207 (2006). http://dx.doi.org/10.1016/j.jcat.2005.10.02910.1016/j.jcat.2005.10.029Search in Google Scholar

[4] Zhou, L., Xu, J., Miao, H., Wang, F., and Li, X., Appl. Catal., A 292, 223 (2005). http://dx.doi.org/10.1016/j.apcata.2005.06.01810.1016/j.apcata.2005.06.018Search in Google Scholar

[5] Storsæter, S., Borg, Ø., Blekkan, E. A., and Holmen, A., J. Catal. 231, 405 (2005). http://dx.doi.org/10.1016/j.jcat.2005.01.03610.1016/j.jcat.2005.01.036Search in Google Scholar

[6] Hussein, G. A. M., Powder Technol. 118, 285 (2001). http://dx.doi.org/10.1016/S0032-5910(00)00384-310.1016/S0032-5910(00)00384-3Search in Google Scholar

[7] Hussein, G. A. M. and Balboul, B. A. A., Powder Technol. 103, 156 (1999). http://dx.doi.org/10.1016/S0032-5910(98)00226-510.1016/S0032-5910(98)00226-5Search in Google Scholar

[8] Syukri, Ban, T., Ohya, Y., and Takahashi, Y., Mater. Chem. Phys. 78, 645 (2003). http://dx.doi.org/10.1016/S0254-0584(02)00185-210.1016/S0254-0584(02)00185-2Search in Google Scholar

[9] Girardon, J. S., Lermontov, A. S., Gengembre, L., Chernavskii, P. A., Griboval-Constant, A., and Khodakov, A. Y., J. Catal. 230, 339 (2005). http://dx.doi.org/10.1016/j.jcat.2004.12.01410.1016/j.jcat.2004.12.014Search in Google Scholar

[10] Alshehri, S. M., Monshi, M. A. S., Abd El-Salam, N. M., and Mahfouz, R. M., Thermochim. Acta 363, 61 (2000). http://dx.doi.org/10.1016/S0040-6031(00)00602-X10.1016/S0040-6031(00)00602-XSearch in Google Scholar

[11] Ingier-Stocka, E. and Grabowska, A., J. Therm. Anal. 54, 115 (1998). http://dx.doi.org/10.1023/A:101011690241210.1023/A:1010116902412Search in Google Scholar

[12] De Jesus, J. C., Gonzalez, I., Quevedo, A., and Puerta, T., J. Mol. Catal. A: Chem. 228, 283 (2005). http://dx.doi.org/10.1016/j.molcata.2004.09.06510.1016/j.molcata.2004.09.065Search in Google Scholar

[13] Nickolov, Z., Georgiev, G., Stoilova, D., and Ivanov, I., J. Mol. Struct. 354, 119 (1995). http://dx.doi.org/10.1016/0022-2860(95)08877-X10.1016/0022-2860(95)08877-XSearch in Google Scholar

[14] Hussein, G. A. M., Mekhemer, G. A. H., and Balboul, B. A. A., Phys. Chem. Chem. Phys. 2, 2033 (2000). http://dx.doi.org/10.1039/b000220h10.1039/b000220hSearch in Google Scholar

Published Online: 2007-8-1
Published in Print: 2007-8-1

© 2007 Institute of Chemistry, Slovak Academy of Sciences

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