Simple and effective preparation of highly efficient heterogeneous base catalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43931494" target="_blank" >RIV/60461373:22310/25:43931494 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22320/25:43931494 RIV/60461373:22350/25:43931494

Výsledek na webu

<a href="https://pubs.rsc.org/en/content/articlepdf/2025/cy/d4cy01454e" target="_blank" >https://pubs.rsc.org/en/content/articlepdf/2025/cy/d4cy01454e</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d4cy01454e" target="_blank" >10.1039/d4cy01454e</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Simple and effective preparation of highly efficient heterogeneous base catalysts

Popis výsledku v původním jazyce

The simple hydration of physically mixed Mg and Al oxides results in the formation of an LDH (layered double hydroxide) phase via the dissolution-precipitation-crystallization mechanism. Nevertheless, the change in the properties and catalytic performances of these materials with respect to the hydration conditions has not been well explained to date. Therefore, in this study, we hydrated physically mixed Mg and Al oxides at T = 25 °C or 75 °C within a time range of 5 minutes to 7 days. Subsequently, we characterized the properties of the resulting materials using an array of appropriate methods and assessed their performances in aldol condensation of furfural and acetone. An increase in the hydration time and temperature promoted the formation of the desired LDH phase. Nevertheless, the performance of the catalysts did not improve accordingly. We assumed that the surprisingly inferior performance of the LDH-rich catalysts was due to the deposition of Al species on their external solid surface instead of being incorporated in the LDH phase, and these species blocked the access of reactants to the catalytically active sites in the HTC phase, resulting in a decreased catalytic activity. Thus, the maximum activity of the catalysts was observed at a relatively low concentration of water-soluble Al species and, accordingly, at a relative content of LDH phase of 20-25%. These results are beneficial for understanding the relationship between the hydration conditions of MgO + Al2O3 physical mixtures and the properties of the derived LDH-phase containing solids and have potential in the design of green, efficient and stable solid base catalysts. © 2025 The Royal Society of Chemistry.

Název v anglickém jazyce

Simple and effective preparation of highly efficient heterogeneous base catalysts

Popis výsledku anglicky

The simple hydration of physically mixed Mg and Al oxides results in the formation of an LDH (layered double hydroxide) phase via the dissolution-precipitation-crystallization mechanism. Nevertheless, the change in the properties and catalytic performances of these materials with respect to the hydration conditions has not been well explained to date. Therefore, in this study, we hydrated physically mixed Mg and Al oxides at T = 25 °C or 75 °C within a time range of 5 minutes to 7 days. Subsequently, we characterized the properties of the resulting materials using an array of appropriate methods and assessed their performances in aldol condensation of furfural and acetone. An increase in the hydration time and temperature promoted the formation of the desired LDH phase. Nevertheless, the performance of the catalysts did not improve accordingly. We assumed that the surprisingly inferior performance of the LDH-rich catalysts was due to the deposition of Al species on their external solid surface instead of being incorporated in the LDH phase, and these species blocked the access of reactants to the catalytically active sites in the HTC phase, resulting in a decreased catalytic activity. Thus, the maximum activity of the catalysts was observed at a relatively low concentration of water-soluble Al species and, accordingly, at a relative content of LDH phase of 20-25%. These results are beneficial for understanding the relationship between the hydration conditions of MgO + Al2O3 physical mixtures and the properties of the derived LDH-phase containing solids and have potential in the design of green, efficient and stable solid base catalysts. © 2025 The Royal Society of Chemistry.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/GA19-22978S" target="_blank" >GA19-22978S: Kvantifikace basicity rekonstruovaných podvojných vrstevnatých hydroxidů a její vztah s katalytickým chováním v bazicky katalyzovaných reakcích</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Catalysis Science &amp; Technology

ISSN

2044-4753

e-ISSN

2044-4761

Svazek periodika

15

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

1506-1524

Kód UT WoS článku

001408393100001

EID výsledku v databázi Scopus

2-s2.0-86000383223