Seeharaj, Panpailin

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Seeharaj, Panpailin
Alternative Name
Seeharaj, P.
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panpailin.se@kmitl.ac.th

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    Item type:Publication,
    Non-isothermal kinetics of the thermal decomposition of sodium oxalate Na2C2O4
    (2012-03-01)
    Chaiyo, Nopsiri
    ;
    Muanghlua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Boonchom, Banjong
    ;
    Seeharaj, Panpailin
    The thermal transformation of Na<inf>2</inf>C<inf>2</inf>O<inf>4</inf> was studied in N<inf>2</inf> atmosphere using thermo gravimetric (TG) analysis and differential thermal analysis (DTA). Na<inf>2</inf>C<inf>2</inf>O<inf>4</inf> and its decomposed product were characterized using a scanning electron microscope (SEM) and the X-ray diffraction technique (XRD). The non-isothermal kinetic of the decomposition was studied by the mean of Ozawa and Kissinger-Akahira-Sunose (KAS) methods. The activation energies (Eα) of Na<inf>2</inf>C<inf>2</inf>O<inf>4</inf> decomposition were found to be consistent. Decreasing Eα at increased decomposition temperature indicated the multi-step nature of the process. The possible conversion function estimated through the Liqing-Donghua method was 'cylindrical symmetry (R <inf>2</inf> or F<inf>1/2</inf>)' of the phase boundary mechanism. Thermodynamic functions (DH*, DG* and DS*), calculated by the Activated complex theory and kinetic parameters, indicated that the decomposition step is a high energy pathway and revealed a very hard mechanism. © Akadémiai Kiadó, Budapest, Hungary 2011.