Acid Treated Montmorillonite—Eco-Friendly Clay as Catalyst in Carvone Isomerization to Carvacrol

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F21%3A43922089" target="_blank" >RIV/60461373:22310/21:43922089 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/2624-781X/2/4/31" target="_blank" >https://www.mdpi.com/2624-781X/2/4/31</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/reactions2040031" target="_blank" >10.3390/reactions2040031</a>

Result language

angličtina

Original language name

Acid Treated Montmorillonite—Eco-Friendly Clay as Catalyst in Carvone Isomerization to Carvacrol

Original language description

Acid-treated montmorillonites (MMT) were used as catalysts of carvone isomerization to carvacrol. Mineral acids—sulfuric, hydrochloric, nitric acids and organic acids (acetic and chloroacetic)—were used for the acid treatment. Prepared materials were characterized by available characterization methods, namely XRD, EA, TPD, TPO, UV-Vis, laser light scattering and nitrogen physisorption. The structure of montmorillonite remained intact after treatment. However, TPD proved the increase of acidity of acid-treated materials comparing pure montmorillonite. All materials were tested in the isomerization of carvone, producing carvacrol as the desired product. The initial reaction rate increased using the materials in the row MMT-COOH &lt; MMT-HNO3 &lt; MMT-ClCOOH &lt; MMT-H2SO4 &lt; MMT-HCl, which is in accordance with the pKa of acids used for the treatment. The number of weak acid sites strongly influenced the selectivity to carvacrol. The optimal solvent for the reaction was toluene. Total conversion of carvone and the selectivity to carvacrol 95.5% was achieved within 24 h under 80 °C, with toluene as solvent and montmorillonite treated by chloroacetic acid as catalyst. The catalyst may be reused after calcination with only a low loss of activity

Czech name

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Czech description

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Type

J_ost - Miscellaneous article in a specialist periodical

CEP classification

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OECD FORD branch

10401 - Organic chemistry

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2021

Confidentiality

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

Name of the periodical

Reactions

ISSN

2624-781X

e-ISSN

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Volume of the periodical

2

Issue of the periodical within the volume

4

Country of publishing house

CH - SWITZERLAND

Number of pages

13

Pages from-to

486-498

UT code for WoS article

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EID of the result in the Scopus database

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