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

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, ORCID}
Source Title	Industrial and Engineering Chemistry Research. - : American Chemical Society - ISSN 0888-5885 Roč. 58, č. 8 (2019), s. 2868-2881
Number 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

Number of the records: 1