The Thermal Decomposition of Ammonium Sulfate and Its Reaction with Iron(III) Oxide

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  • NAKAMURA Hidetsugu
    Department of Environmental Science, Kyushu Institute of Technology
  • HARA Yasutake
    Department of Environmental Science, Kyushu Institute of Technology
  • OSADA Hideyo
    Department of Environmental Science, Kyushu Institute of Technology

Bibliographic Information

Other Title
  • 硫酸アンモニウムの熱分解および酸化鉄(III)との反応
  • 硫酸アンモニウムと金属酸化物との反応　Ｉ　　硫酸アンモニウムの熱分解および酸化鉄（ＩＩＩ）との反応

Description

The thermal decomposition of (NH4)2SO4 and its reaction with Fe2O3 were studied by thermal analysis, X-ray diffraction, gas chromatography and chemical analysis. When (NH4)2SO4 was heated at a heating rate of 10°C/min, (NH4)3H (SO4)2, NH4HSO4 and (NH4)2S2O7 were formed as intermediate decompotition products which changed finally to gaseous products. The condition of experiment exerted an influence upon the reaction scheme. An experiment under high pressures restrained the decomposition of (NH4)2SO4, leading to a finding of the melting of (NH4)2SO4 at 368°C, which can not take place under the normal atmosphere.<BR>The thermal reaction of (NH4)2SO4 with Fe2O3 under the normal pressure yielded (NH4)3Fe(SO4)3 over the temperature range 224-310°C, NH4Fe(SO4)2 at 310-370°C, Fe2(SO4)3 at 370-444°C and finally Fe2O3 at 564-674°C. Valency of iron remained tervalent throughout the reaction and neither the oxidation of iron nor its reduction did occur.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1980 (5), 706-710, 1980-05-10

    The Chemical Society of Japan

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