Thermal analysis in oxidative and pyrolysis conditions of alkaline earth metals picolinates using the techniques: TG-DSC, DSC, MWTA, HSM and EGA (TG-DSC-FTIR and HSM-MS)

Author(s)

Nascimento, A. L. C. S. ^{[1, 2]} ; Parkes, G. M. B. ^[2] ; Ashton, G. P. ^[2] ; Fernandes, R. P. ^[1] ; Teixeira, J. A. ^{[1, 3]} ; Nunes, W. D. G. ^{[1, 4]} ; Ionashiro, M. ^[1] ; Caires, F. J. ^{[1, 5]}

Affiliation

^[1] Univ Estadual Paulista, UNESP, Inst Quim, BR-14801970 Araraquara, SP - Brazil

^[2] Univ Huddersfield, Dept Chem, Thermal Methods Res Unit, Huddersfield HD1 3DH, W Yorkshire - England

^[3] Inst Fed Educ Ciencia & Tecnol Parana IFPR, BR-87703536 Paranavai, PR - Brazil

^[4] Inst Fed Educ Ciencia & Tecnol Rondonia IFRO, BR-76850000 Guajara Mirim, RO - Brazil

^[5] Univ Estadual Paulista, UNESP, Fac Ciencias, Dept Quim, BR-17033260 Bauru, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS; v. 135, p. 67-75, OCT 2018.
• Web of Science Citations: 2

Abstract

Synthesis, characterization, thermal stability and pyrolysis of some alkaline earth picolinates M (C6H5NO2)(2)center dot nH(2)O (where M = Mg(II), Ca(II), Sr(II) and Ba(II) and n = di (Mg), mono (Ca), hemi three (Sr) hydrated) were investigated using a range of techniques including simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), evolved gas analysis (EGA), differential scanning calorimetry (DSC), Hot-Stage microscopy (HSM), powder X-ray diffractometry (PXRD), complexometry with EDTA and elemental analysis (EA). The TG-DSC curves show that the hydrated compounds dehydrate in a single step of mass loss and the thermal stability of the anhydrous compound is little influenced from the atmosphere used. On the other hand, the mechanisms of thermal decomposition are profoundly influenced by the atmosphere used, as can also be observed in the EGA data. In addition, a comparison between two calorimetric techniques, Microwave Thermal Analysis (MWTA) and DSC, was made which showed similar profiles. Two evolved gas analysis (EGA) techniques: TG-DSC coupled to FTIR and HSM coupled to a quadrupole mass spectrometer (MS) were also used to provide additional information about the pyrolysis mechanism. (AU)

• FAPESP's process: 17/14936-9 - Preparation, characterization and thermoanalytical studies of heterogeneous catalysts of double selenates of Mg/Co and Mg/Cu in biodiesel production using different oils
• Grantee: Massao Ionashiro
• Support Opportunities: Regular Research Grants