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Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products

The analysis of gaseous products reveals the characteristics, mechanisms, and kinetic equations describing the dehydroxylation and decarburization in coal series kaolinite. The results show that the dehydroxylation of coal series kaolinite arises from the calcination of kaolinite and boehmite within...

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Autores principales: Cheng, Simeng, Jiu, Shaowu, Li, Hui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8003185/
https://www.ncbi.nlm.nih.gov/pubmed/33803732
http://dx.doi.org/10.3390/ma14061493
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author Cheng, Simeng
Jiu, Shaowu
Li, Hui
author_facet Cheng, Simeng
Jiu, Shaowu
Li, Hui
author_sort Cheng, Simeng
collection PubMed
description The analysis of gaseous products reveals the characteristics, mechanisms, and kinetic equations describing the dehydroxylation and decarburization in coal series kaolinite. The results show that the dehydroxylation of coal series kaolinite arises from the calcination of kaolinite and boehmite within the temperature range of 350–850 °C. The activation energy for dehydroxylation is 182.71 kJ·mol(−1), and the mechanism conforms to the A2/3 model. Decarburization is a two-step reaction, occurring as a result of the combustion of carbon and the decomposition of a small amount of calcite. The temperature range in the first step is 350–550 °C, and in the second is 580–830 °C. The first step decarburization reaction conforms to the A2/3 mechanism function, and the activation energy is 160.94 kJ·mol(−1). The second step decarburization reaction follows the B3 mechanism function, wherein the activation energy is 215.47 kJ·mol(−1). A comparison with the traditional methods proves that the kinetics method utilizing TG-FTIR-MS is feasible.
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spelling pubmed-80031852021-03-28 Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products Cheng, Simeng Jiu, Shaowu Li, Hui Materials (Basel) Article The analysis of gaseous products reveals the characteristics, mechanisms, and kinetic equations describing the dehydroxylation and decarburization in coal series kaolinite. The results show that the dehydroxylation of coal series kaolinite arises from the calcination of kaolinite and boehmite within the temperature range of 350–850 °C. The activation energy for dehydroxylation is 182.71 kJ·mol(−1), and the mechanism conforms to the A2/3 model. Decarburization is a two-step reaction, occurring as a result of the combustion of carbon and the decomposition of a small amount of calcite. The temperature range in the first step is 350–550 °C, and in the second is 580–830 °C. The first step decarburization reaction conforms to the A2/3 mechanism function, and the activation energy is 160.94 kJ·mol(−1). The second step decarburization reaction follows the B3 mechanism function, wherein the activation energy is 215.47 kJ·mol(−1). A comparison with the traditional methods proves that the kinetics method utilizing TG-FTIR-MS is feasible. MDPI 2021-03-18 /pmc/articles/PMC8003185/ /pubmed/33803732 http://dx.doi.org/10.3390/ma14061493 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cheng, Simeng
Jiu, Shaowu
Li, Hui
Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products
title Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products
title_full Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products
title_fullStr Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products
title_full_unstemmed Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products
title_short Kinetics of Dehydroxylation and Decarburization of Coal Series Kaolinite during Calcination: A Novel Kinetic Method Based on Gaseous Products
title_sort kinetics of dehydroxylation and decarburization of coal series kaolinite during calcination: a novel kinetic method based on gaseous products
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8003185/
https://www.ncbi.nlm.nih.gov/pubmed/33803732
http://dx.doi.org/10.3390/ma14061493
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