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Decomposition of Potassium Hydrogen Carbonate: Thermochemistry, Kinetics, and Textural Changes in Solids.
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SYSNO ASEP 0502095 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Decomposition of Potassium Hydrogen Carbonate: Thermochemistry, Kinetics, and Textural Changes in Solids. Author(s) Hartman, Miloslav (UCHP-M) RID, ORCID, SAI
Svoboda, Karel (UCHP-M) RID, ORCID, SAI
Čech, B. (CZ)
Pohořelý, Michael (UCHP-M) RID, ORCID, SAI
Šyc, Michal (UCHP-M) RID, SAI, ORCIDSource Title Industrial and Engineering Chemistry Research. - : American Chemical Society - ISSN 0888-5885
Roč. 58, č. 8 (2019), s. 2868-2881Number of pages 14 s. Language eng - English Country US - United States Keywords activation energy ; syntering ; decomposition Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering R&D Projects EF16_019/0000753 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) TE02000236 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Limited access Institutional support UCHP-M - RVO:67985858 UT WOS 000460199800025 EID SCOPUS 85062104267 DOI 10.1021/acs.iecr.8b06151 Annotation 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. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0294038
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