Acidity and porosity properties of zeolites affect their catalytic performance in thymol synthesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10481690" target="_blank" >RIV/00216208:11310/24:10481690 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WpdxkqgPIn" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WpdxkqgPIn</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.micromeso.2024.113198" target="_blank" >10.1016/j.micromeso.2024.113198</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Acidity and porosity properties of zeolites affect their catalytic performance in thymol synthesis

Popis výsledku v původním jazyce

Thymol is synthesized from m-cresol alkylation reaction with 2-propanol. A few commercial zeolites have been tested in this reaction, but the influence of acidity and porosity of a zeolite on the m-cresol conversion and thymol yield is scarcely studied. Isomorphously-substituted Al-, Ga-, Fe-, B-, and In-UTL with different heteroelements and thus different ratio between strong and weak sites give insight into the effect of acidity. Isoreticular zeolites Al-UTL, Al-IPC-7, and Al-IPC-2 with different pore sizes reveal the effect of porosity. In this study, mcresol conversion was far from comparable over Al-UTL or Ga-UTL (X = 18-19 %) and Fe-UTL, B-UTL, or In-UTL (X = 2-3 %) having different concentration of strong Br phi nsted acid sites. Thymol yield was also higher over Aland Ga-UTL (Y = 11-13 %) than over Fe-, B-, and In-UTL (Y = 1-2 %). The easier accessibility to the strong Br phi nsted acid sites in Al-UTL, provided by bigger pore sizes, resulted in higher m-cresol conversion and thymol yield compared to Al-IPC-7 (X = 15 % and Y = 8 %) and Al-IPC-2 (X = 6 % and Y = 2 %). In addition, the stronger Br phi nsted acidity and large and extra-large porosity in Al-UTL and Ga-UTL facilitated the rearrangement of isopropyl-3-methylphenyl ether - the product of the O-alkylation pathway - to thymol. Thus, Al-UTL and GaUTL (along with Al-FAU reference material) confirmed the optimum structural properties for a high selectivity to thymol.

Název v anglickém jazyce

Acidity and porosity properties of zeolites affect their catalytic performance in thymol synthesis

Popis výsledku anglicky

Thymol is synthesized from m-cresol alkylation reaction with 2-propanol. A few commercial zeolites have been tested in this reaction, but the influence of acidity and porosity of a zeolite on the m-cresol conversion and thymol yield is scarcely studied. Isomorphously-substituted Al-, Ga-, Fe-, B-, and In-UTL with different heteroelements and thus different ratio between strong and weak sites give insight into the effect of acidity. Isoreticular zeolites Al-UTL, Al-IPC-7, and Al-IPC-2 with different pore sizes reveal the effect of porosity. In this study, mcresol conversion was far from comparable over Al-UTL or Ga-UTL (X = 18-19 %) and Fe-UTL, B-UTL, or In-UTL (X = 2-3 %) having different concentration of strong Br phi nsted acid sites. Thymol yield was also higher over Aland Ga-UTL (Y = 11-13 %) than over Fe-, B-, and In-UTL (Y = 1-2 %). The easier accessibility to the strong Br phi nsted acid sites in Al-UTL, provided by bigger pore sizes, resulted in higher m-cresol conversion and thymol yield compared to Al-IPC-7 (X = 15 % and Y = 8 %) and Al-IPC-2 (X = 6 % and Y = 2 %). In addition, the stronger Br phi nsted acidity and large and extra-large porosity in Al-UTL and Ga-UTL facilitated the rearrangement of isopropyl-3-methylphenyl ether - the product of the O-alkylation pathway - to thymol. Thus, Al-UTL and GaUTL (along with Al-FAU reference material) confirmed the optimum structural properties for a high selectivity to thymol.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Microporous and Mesoporous Materials

ISSN

1387-1811

e-ISSN

1873-3093

Svazek periodika

376

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

113198

Kód UT WoS článku

001248110700001

EID výsledku v databázi Scopus

2-s2.0-85194494280