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Title

Thermal behavior and kinetic analysis of intercalated phases of α-titanium phosphate

AuthorsAlfonso, Belén F.; Trobajo, Camino ; Huidobro, José A.; Iglesias, Isabel; García, José R.
KeywordsTitanium phosphate
Intercalation
Thermal decomposition
Kinetics
Issue Date2019
Citation2nd Journal of Thermal Analysis and Calorimetry Conference (2019)
AbstractIn a previous work, our research group described the synthesis of the metallic phases of α-phosphate of titanium including both divalent ions (Co2+ and Ni2+) and trivalent ions (Fe3+ and Cr3+). It is well known the precursor α-Ti(HPO4)2·H2O (layered solid that crystallizes in the monoclinic system space group P21/c) possesses ion- exchange properties with monovalent elements in aqueous media, but it has a low affinity towards divalent and trivalent transitionmetal ions. In this case, compounds of general formula TiMII xH2-2x(PO4)2·yRNH2·nH2O (x = 0.0-1.0, y = 0.1-0.8) and TiMIII xH2-3x(PO4)2 ·yRNH2·nH2O (x = 0.00-0.67, y = 0.1-1.1) were prepared through an intermediate phosphate, Ti(PO4)2·2C3H7NH3·H2O, obtained by reaction of the precursor with n-propylamine. In this way, the interlayer distance increased from 7.6 Å for the initial solid up to 16.9 Å for the intercalated phosphate. Thermogravimetric analysis and X-ray diffraction data led that the thermal decomposition takes place in three sequential stages that were associated with dehydration at moderate temperatures (T < 473 K), amine desorption (573-873 K), and condensation (T > 1173 K). In this work, we present a deeper study of these compounds. On the one hand, data of TG/ DTG/DTA and the associated mass spectrometric signals of the evacuated species are analysed. On the other, kinetic analysis is performed by using isoconversional methods, which allow us to calculate the activation energy as a function of the extent of conversion without knowing the pre-exponential factor or the model function. Differential and non-linear procedures are used and the values of the kinetic parameters obtained are checked by reconstructing the conversion curves and comparing with the experimental data.
DescriptionResumen del póster presentado a la 2nd Journal of Thermal Analysis and Calorimetry Conference (JTACC), celebrada en Budapest (Hungría) del 18 al 21 de junio de 2019.
URIhttp://hdl.handle.net/10261/211314
Appears in Collections:(CINN) Comunicaciones congresos
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