Thermal Decomposition of Nickel, Cobalt and Iron (II) Oxalate Dihydrate in Various Atmospheres

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  • UMEMURA KOZO
    Department of Chemistry, Faculty of Liberal Arts and Sciences, University of Osaka Prefecture

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Other Title
  • 種々の雰囲気中でのニッケル,コバルトおよび鉄(II)シュウ酸塩2水和物の熱分解
  • 種々のふん囲気中でのニッケル，コバルトおよび鉄（ＩＩ）しゅう酸塩２水和物の熱分解

Description

Thermal decomposition of nickel, cobalt and iron(II) oxalate dihydrate in the atmosphere of air, nitrogen, argon or hydrogen was studied by differential thermal analysis, thermogravimetry, evolved gas analysis and chemical analysis with magnetic measurements.<BR>Following the completion of dehydration, nickel, cobalt and iron(II) oxalate decomposed to give DTA peaks at 346°, 359° and 384° C in the nitrogen atmosphere, respectively. These decomposition temperatures in air were lowered by 8° C for nickel oxalate, 76° C for cobalt oxalate and 164C for iron(III)oxalate showing the prmoting effect of oxygen on, the decompositionA rapid heating of these oxalates in air gave the the decomposition products such as over 96 wt%of meta11ic nickel, a mixture of.85 wt% of CoO with Co3q, i mixture of CQ.70wt%Qf FeO wth Fe2O2-. r cobalt ranging from 85 to 92 wt%and FeO over 93 wt%, respectively. The cotent of CO in the gas evolved by the decomposition was 2.5vol%for nickel oxalate and 48 vol%for cobalt oxalate, and in the case of iron(II)oxalate roughly equal volume of CO and CO3was detected.<BR>Under the ow of hydrogen, the formation of CH4 was catalysed in the cases of decomposi, Lion of nickel and, cobalt oxalate; catalytic ability of cobalt being superior to that of nickel. In the case of iron(III)6xalate, CHI was nt, s but threaaiori was seen t6 be prornted. From these results a probable process, of thermal decompositio as discussed.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1975 (6), 968-975, 1975-06-10

    The Chemical Society of Japan

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