Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 132, Issue 1, Pages 493-502Publisher
SPRINGER
DOI: 10.1007/s10973-017-6901-4
Keywords
Ammonium hydroxydisulfitoferriate(III); Thermal studies; Mossbauer spectroscopy; Decomposition; Redox reaction
Funding
- Hungarian Academy of Sciences
- Ministry of Education, Science and Technological Development of the Republic of Serbia [172014]
- [UNKP-17-4-IV-BME-188]
- [OTKA PD-109129]
- [VEKOP-2.3.2.-16-2017-00013]
- [K 124212]
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Synthesis of ammonium hydroxodisulfitoferriate(III), (diammonium catena-{bis(mu (2)-sulfito-kappa O,kappa O)-mu (2)-hydroxo-kappa O-2}ferrate(III) monohydrate) (NH4)(2)[Fe(OH)(SO3)(2)]center dot H2O (compound 1) and its thermal behavior is reported. The compound is stable in air. Its thermal decomposition proceeds without the expected quasi-intramolecular oxidation of sulfite ion with ferric ions. The disproportionation reaction of the ammonium sulfite, formed from the evolved NH3, SO2 and H2O in the main decomposition stage of 1, results in the formation of ammonium sulfate and ammonium sulfide. The ammonium sulfide is unstable at the decomposition temperature of 1 (150 A degrees C) and transforms into NH3 and H2S which immediately forms elementary sulfur by reaction with SO2. The formation and decomposition of other intermediate compounds like (NH4)(2)SnOx (n = 2, x = 3 and n = 3, x = 6) results in the same decomposition products (S, SO2 and NH3). Two basic iron sulfates, formed in different ratios during synthesizing experiments performed under N-2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decomposition product was proved to be alpha-Fe2O3 (mineral name hematite).
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