Hydrothermal rehydroxylation of kaolinite studied by thermal analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F13%3A43895568" target="_blank" >RIV/60461373:22310/13:43895568 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22810/13:43895568

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Hydrothermal rehydroxylation of kaolinite studied by thermal analysis

Popis výsledku v původním jazyce

The effect of hydrothermal conditions on process of kaolinite rehydroxylation at 180 °C and 230 °C and for soaking times from 1 to 200 hour was studied by thermal analysis (DTA, DSC, TG). It is shown that the kaolinite dehydroxylation of rehydroxylated samples shifts to lower temperatures compared to the original kaolinite. Amounts of kaolinite in rehydroxylated samples were calculated from TG curves. The curve of the kaolinite mass gain plotted against the time of hydrothermal treatment indicates a twostage process with a different mass gain rate representing short and long-time measurements. Multiple dehydroxylation was studied by repeated calcinations (2 h at 600 °C) and hydrothermal treatments (10 h at 230 °C). It was proved that values of activation energy (Ea) of multiple dehydroxylations decreased with the increasing number of repeated treatments. Conclusions of the study were applied for the investigation of kaolinite origin in archaeological samples from Roztoky near Prague.

Název v anglickém jazyce

Hydrothermal rehydroxylation of kaolinite studied by thermal analysis

Popis výsledku anglicky

The effect of hydrothermal conditions on process of kaolinite rehydroxylation at 180 °C and 230 °C and for soaking times from 1 to 200 hour was studied by thermal analysis (DTA, DSC, TG). It is shown that the kaolinite dehydroxylation of rehydroxylated samples shifts to lower temperatures compared to the original kaolinite. Amounts of kaolinite in rehydroxylated samples were calculated from TG curves. The curve of the kaolinite mass gain plotted against the time of hydrothermal treatment indicates a twostage process with a different mass gain rate representing short and long-time measurements. Multiple dehydroxylation was studied by repeated calcinations (2 h at 600 °C) and hydrothermal treatments (10 h at 230 °C). It was proved that values of activation energy (Ea) of multiple dehydroxylations decreased with the increasing number of repeated treatments. Conclusions of the study were applied for the investigation of kaolinite origin in archaeological samples from Roztoky near Prague.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

AC - Archeologie, antropologie, etnologie

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ceramics-Silikáty

ISSN

0862-5468

e-ISSN

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Svazek periodika

57

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

6

Strana od-do

342-347

Kód UT WoS článku

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EID výsledku v databázi Scopus

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