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Decomposition of Potassium Hydrogen Carbonate: Thermochemistry, Kinetics, and Textural Changes in Solids.

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    0502095 - ÚCHP 2020 RIV US eng J - Článek v odborném periodiku
    Hartman, Miloslav - Svoboda, Karel - Čech, B. - Pohořelý, Michael - Šyc, Michal
    Decomposition of Potassium Hydrogen Carbonate: Thermochemistry, Kinetics, and Textural Changes in Solids.
    Industrial and Engineering Chemistry Research. Roč. 58, č. 8 (2019), s. 2868-2881. ISSN 0888-5885
    Grant CEP: GA MŠk(CZ) EF16_019/0000753; GA TA ČR TE02000236
    Institucionální podpora: RVO:67985858
    Klíčová slova: activation energy * syntering * decomposition
    Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
    Obor OECD: Chemical process engineering
    Impakt faktor: 3.573, rok: 2019
    http://hdl.handle.net/11104/0294038

    To determine unbiased rates of the decomposition of KHCO3, slowly increasing- and constant-temperature TGA methods were employed with small, finely ground samples. Such reaction provides a novel, porous, and highly reactive sorbent for noxious and/or malodorous gases. The bicarbonate commences decomposing at 364 K, and the maximum rate of reaction, attained at 421.9 K, amounts to 5.73 × 10–4 1/s. Taking advantage of the Schlömilch function, an Arrhenius-type relationship is developed by an integral method: the activation energy is as large as 141.3 kJ/mol and the order of reaction amounts to 1.145. While the pore volume made by calcination (0.2309 cm3/g) is not affected by temperature at 403–503 K, the mean pore diameter and the grain size augment with increasing temperature. The diagram presented makes it possible to conveniently predict the conditions to attain near-complete conversion of the bicarbonate and minimize undesirable sintering of the nascent carbonate.
    Trvalý link: http://hdl.handle.net/11104/0294038
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