Investigation of Thermal Decomposition Behavior of Cerium (III) Acetate Hydrate

Yıl 2012, Cilt: 25 Sayı: 3, 777 - 782, 19.07.2012

Aliye Arabacı Nuri Solak

Öz

 The thermal decomposition behavior of Cerium (III) Acetate Hydrate, Ce(CH₃CO₂)₃1.5H₂O , was investigated

 by using in-situ  High Temperature FTIR Spectroscopy (in N₂), High Temperature X-ray diffraction (HT-XRD)

 (in air) and TG/DTA - MS techniques ( Ar and dry air). Thermal decomposition of Ce(CH₃CO₂)₃1.5H₂O to CeO₂, ceria, in argon occurred through several endothermic and exothermic reactions. Through these consecutive reactions, amorphous cerium anhydrous acetate formed above the dehydration temperature. Afterwards, crystallization of the anhydrous acetate took place with the increasing temperature and ceria formed in cubic phase as the final product. In dry air, the decomposition reaction is completed around 330°C and CeO₂ was formed as the final product. The difference between the two atmospheres was significant in between 250-550°C. The activation energy for the crystallization of cerium anhydrous acetate was determined as 244 kJ mol^-1 under non-isothermal conditions by using Kissinger equation.

                Keywords; Ce(CH₃CO₂)₃1.5H₂O, Ceria, HT-XRD,

               Thermal decomposition

 

Anahtar Kelimeler

Ce(CH3CO2)31.5H2O, Ceria, HT-XRD, Thermal decomposition

Kaynakça

• electrolytes for IT-SOFC operation at 500 oC, Solid State Ionics, 29 : 95-110, (2000). electrolytes – Review, Solid State Ionics, 83: 1-16, (1996).
• Reactivity in the systems LaGaO3/Ni and CeO2/Ni , Fuel Cells, 2 : 87-92,(2006).
• CeO2-containing materials, Catal. Rev.-Sci. Eng., 38 : 520,(1996). automotive exhaust catalysts 1. Oxygen storage, J. Catal., : 254-265, (1984). characterization of sol-gel deposited ceria films, Solar
• Energy Materials and Solar Cells, 68: 391-400, (2001).
• Foltyn, S.E., Maley, M., Rollett, A.D., Garcia, A.R., Nogar, N.S., Epitaxial CeOFilms as Buffer Layers for High-Temperature Superconducting Thin-Films, Appl. Phys. Lett. 58 : 2165-2167, (1991). study of the lighter rare earth acetates, J Inorg. Nucl. Chem.,28: 2430-2432, (1966).
• Arii,T., Taguchi, T., Kishi, A. , Ogawa, M., Sawada,Y. et al., Thermal Decomposition of Cerium (III) Acetate Studied with Spectrometry (SCTG-MS), J. Eur. Ceram. Soc., 22: 2283- , (2002).
• Thermogravimetric-mass Arii,T., Kishi , A. , Ogawa, M., Sawada, Y. et al., Thermal Decomposition of Cerium (III) Acetate Hydrate by a Three-dimensional Thermal Analysis, The Jpn. Soc. For Anal. Chem., 17: 875-880, (2001).
• Tranquilin, R.L., Bueno, P.R., Varela, J.A., Longo, E. et al., Nanospheres by Microwave-hydrothermal Method, Mater. Lett., 62: 4509-4511,(2008) . of Ceria
• Riccardi, C.S., Lima, R.C., Dos Santos, M.L., Bueno, P.R., Varela, J.A., Longo, E., Solid State Ionics, : 288-293, (2009).
• Nakanishi, K., Solomon, P. H., Infrared Absorption Spectroscopy, 2 nd ed., Holden-Day ,Inc., San Francisco, (1977).
• A. Brãileanu, S. Mihaiu, M. Bán, J. Madarász and Pokol, Thermoanalytical Investigation Tın and Cerium Salt Mixures, J.Therm. Anal. Cal., 80: 613-618, (2005).
• Kissinger, H., Reaction Kinetics in Differential Thermal Analysis, Anal. Chem., 29: 1702-1706, (1957).