Comparative online coupled TG-FTIR and TG/DTA-MS analyses of the evolved gases from thiourea complexes of SnCl2 tetrachloropenta(thiourea) ditin(II), a compound rich in thiourea

János Madarász, Petra Bombicz, Masayuki Okuya, Shoji Kaneko, György Pokol

Research output: Article

23 Citations (Scopus)

Abstract

Identification and monitoring of gaseous species released during thermal decomposition of title compound 1, Sn2(tu)5Cl 4·2H2O (tu stands for thiourea (NH 2)2C=S)) in flowing air atmosphere have been carried out up to 600 °C by both online coupled TG-EGA-FTIR and simultaneous TG/DTA-EGA-MS apparatuses. The first gaseous products of the dehydrated 1, evolved around 190 °C, are carbonyl sulphide (COS), carbon disulfide (CS2), and cyanamide (NH2CN). At 240 °C isothiocyanic acid, HNCS becomes the main product, accompanied by CS2, ammonia (NH3), a small amount of hydrogen cyanide (HCN) and traces of hydrogen chloride (HCl), according to EGA-FTIR spectroscopic analysis. At 250 °C formation of sulphur dioxide (SO2) has been observed by EGA-mass spectrometry. SO2 as air oxidation product of tin sulphides, formed in the previous stages, occurs also around 430 °C, while gaseous oxidation products of the organic residues, such as CO2 and NH 2CN are released at 515 °C. Both oxidation processes are accompanied by an exothermic heat effect. All species identified by FTIR gas cell are also confirmed by mass spectrometry, except HNCS.

Original languageEnglish
Pages (from-to)209-214
Number of pages6
JournalJournal of Analytical and Applied Pyrolysis
Volume72
Issue number2
DOIs
Publication statusPublished - nov. 2004

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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