Evidence of quasi-intramolecular redox reactions during thermal decomposition of ammonium hydroxodisulfitoferriate(III), (NH4)2[Fe(OH)(SO3)2]·H2O

Tünde Kocsis, József Magyari, I. Sajó, T. Pasinszki, Z. Homonnay, Imre M. Szilágyi, Attila Farkas, Zoltán May, Herta Effenberger, Sándor Szakáll, Rajendra P. Pawar, László Kótai

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Synthesis of ammonium hydroxodisulfitoferriate(III), (diammonium catena-{bis(μ2-sulfito-κO,κO)-μ2-hydroxo-κ2O}ferrate(III) monohydrate) (NH4)2[Fe(OH)(SO3)2]·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 °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)2SnOx (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 N2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decomposition product was proved to be α-Fe2O3 (mineral name hematite).

Original languageEnglish
Pages (from-to)493-502
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume132
Issue number1
DOIs
Publication statusPublished - Apr 1 2018

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Redox reactions
Ammonium Compounds
thermal decomposition
Pyrolysis
Decomposition
decomposition
sulfites
Ions
sulfides
ferrates
ferric ions
Sulfites
ammonium sulfates
air
Ammonium Sulfate
products
hematite
Air
Sulfur
Sulfates

Keywords

  • Ammonium hydroxydisulfitoferriate(III)
  • Decomposition
  • Mössbauer spectroscopy
  • Redox reaction
  • Thermal studies

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Evidence of quasi-intramolecular redox reactions during thermal decomposition of ammonium hydroxodisulfitoferriate(III), (NH4)2[Fe(OH)(SO3)2]·H2O. / Kocsis, Tünde; Magyari, József; Sajó, I.; Pasinszki, T.; Homonnay, Z.; Szilágyi, Imre M.; Farkas, Attila; May, Zoltán; Effenberger, Herta; Szakáll, Sándor; Pawar, Rajendra P.; Kótai, László.

In: Journal of Thermal Analysis and Calorimetry, Vol. 132, No. 1, 01.04.2018, p. 493-502.

Research output: Contribution to journalArticle

Kocsis, Tünde ; Magyari, József ; Sajó, I. ; Pasinszki, T. ; Homonnay, Z. ; Szilágyi, Imre M. ; Farkas, Attila ; May, Zoltán ; Effenberger, Herta ; Szakáll, Sándor ; Pawar, Rajendra P. ; Kótai, László. / Evidence of quasi-intramolecular redox reactions during thermal decomposition of ammonium hydroxodisulfitoferriate(III), (NH4)2[Fe(OH)(SO3)2]·H2O. In: Journal of Thermal Analysis and Calorimetry. 2018 ; Vol. 132, No. 1. pp. 493-502.
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abstract = "Synthesis of ammonium hydroxodisulfitoferriate(III), (diammonium catena-{bis(μ2-sulfito-κO,κO)-μ2-hydroxo-κ2O}ferrate(III) monohydrate) (NH4)2[Fe(OH)(SO3)2]·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 °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)2SnOx (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 N2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decomposition product was proved to be α-Fe2O3 (mineral name hematite).",
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AU - Kocsis, Tünde

AU - Magyari, József

AU - Sajó, I.

AU - Pasinszki, T.

AU - Homonnay, Z.

AU - Szilágyi, Imre M.

AU - Farkas, Attila

AU - May, Zoltán

AU - Effenberger, Herta

AU - Szakáll, Sándor

AU - Pawar, Rajendra P.

AU - Kótai, László

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N2 - Synthesis of ammonium hydroxodisulfitoferriate(III), (diammonium catena-{bis(μ2-sulfito-κO,κO)-μ2-hydroxo-κ2O}ferrate(III) monohydrate) (NH4)2[Fe(OH)(SO3)2]·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 °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)2SnOx (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 N2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decomposition product was proved to be α-Fe2O3 (mineral name hematite).

AB - Synthesis of ammonium hydroxodisulfitoferriate(III), (diammonium catena-{bis(μ2-sulfito-κO,κO)-μ2-hydroxo-κ2O}ferrate(III) monohydrate) (NH4)2[Fe(OH)(SO3)2]·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 °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)2SnOx (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 N2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decomposition product was proved to be α-Fe2O3 (mineral name hematite).

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KW - Decomposition

KW - Mössbauer spectroscopy

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KW - Thermal studies

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