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A study of the thermal decompositions of orthotelluric acid, urea and the orthotelluric acid adduct with urea

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Abstract

The thermal decompositions of Te(OH)6, CO(NH2)2 and the adduct Te(OH)6. 2 CO(NH2)2 in air and in an inert atmosphere were studied using TG, DTG, DTA and GC methods in the interval between laboratory temperature and 750°. The first gaseous product of the decomposition of urea is water vapour; the decomposition yields first cyanamide, and then biuret in four steps. The adduct is primarily decomposed to diammonium metatellurate and urea, with liberation of H2O and CO2. Diammonium metatellurate is decomposed toα-TeO3 as intermediate-product.

Zusammenfassung

Die thermische Zersetzung von Te(OH)6, CO(NH2)2 und des Adduktes Te(OH)6·2 CO(NH2)2 wurde in Luft und in einer inerten Atmosphäre durch TG, DTG, DTA und GC-Methoden im Bereich zwischen Raumtemperatur und 750° untersucht. Das erste gasförmige Produkt der Zersetzung von Karbamid ist Wasserdampf, die Zersetzung verläuft über Cyanamid und Biuret in vier Stufen. Das Addukt wird zu Diammonium-Metatellurat und Karbamid zersetzt, unter Freisetzung von H2O und CO2. Das Diammonium-Metatellurat wird zuα-TeO3 als Endprodukt zersetzt.

Резюме

Методами ТГ, ДТГ, ДТА и г азовой хроматографи и изучено термическое разложение Те(ОН)6, CO(NH2)2 и их продукта присоединения Те(ОН)6 · 2CO(NH2)2 в воздушной и инертной атмосфера х в интервале темпера тур от комнатной до 750°. Пары в оды являются первым газообразным продуктом разложени я мочевины, а последующ им продуктом разложения является первоначально циана мид и затем следует четырехстад ийное образование биурета. Аддукт перво начально разлагаетс я до метателлурат аммони я и мочевины с выделением СО2 и Н2О. Ме тателлурат аммония в свою очередь разлагается до α-ТеО3 как конечного продукта.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40, Prague 2

    J. Fábry, J. Loub & L. Feltl

  2. Department of Analytical Chemistry, Charles University, Hlavova 2030, 128 40, Prague 2, Czechoslovakia

    L. Feltl

Authors
  1. J. Fábry
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  2. J. Loub
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  3. L. Feltl
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Fábry, J., Loub, J. & Feltl, L. A study of the thermal decompositions of orthotelluric acid, urea and the orthotelluric acid adduct with urea. Journal of Thermal Analysis 24, 95–100 (1982). https://doi.org/10.1007/BF01914804

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  • DOI: https://doi.org/10.1007/BF01914804

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