Fading memory of MgAl hydrotalcites at mild rehydration conditions deteriorates their performance in aldol condensation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F22%3A43923601" target="_blank" >RIV/60461373:22310/22:43923601 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22320/22:43923601 RIV/60461373:22350/22:43923601

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0926860X22000059?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0926860X22000059?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcata.2022.118482" target="_blank" >10.1016/j.apcata.2022.118482</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fading memory of MgAl hydrotalcites at mild rehydration conditions deteriorates their performance in aldol condensation

Popis výsledku v původním jazyce

MgAl hydrotalcites (HTCs) are widely used as basic heterogenous catalysts. Their calcination followed by rehydration enhances their basicity and catalytic activity. The effect of repetitive “calcination-rehydration” treatments on their properties and catalytic performance needs to be established to understand regeneration and reusability of HTCs. Therefore, we investigated the properties of MgAl HTCs in dependence on the rehydration conditions and the number of repeated calcination-rehydration cycles. We found that regardless of the rehydration conditions, all catalysts after the first rehydration recovered their properties and furfural conversion was &gt; 80%. After successive treatments at 25 °C, the HTCs properties deteriorated significantly and furfural conversion dropped &lt; 5%. When rehydrating at 75 °C for 120 min the characteristics and performance of the rehydrated HTCs were maintained near the original values. We concluded that complete rehydration needed to maximize the catalytic activity was associated with the efficient reincorporation of Al species into the HTC framework.

Název v anglickém jazyce

Fading memory of MgAl hydrotalcites at mild rehydration conditions deteriorates their performance in aldol condensation

Popis výsledku anglicky

MgAl hydrotalcites (HTCs) are widely used as basic heterogenous catalysts. Their calcination followed by rehydration enhances their basicity and catalytic activity. The effect of repetitive “calcination-rehydration” treatments on their properties and catalytic performance needs to be established to understand regeneration and reusability of HTCs. Therefore, we investigated the properties of MgAl HTCs in dependence on the rehydration conditions and the number of repeated calcination-rehydration cycles. We found that regardless of the rehydration conditions, all catalysts after the first rehydration recovered their properties and furfural conversion was &gt; 80%. After successive treatments at 25 °C, the HTCs properties deteriorated significantly and furfural conversion dropped &lt; 5%. When rehydrating at 75 °C for 120 min the characteristics and performance of the rehydrated HTCs were maintained near the original values. We concluded that complete rehydration needed to maximize the catalytic activity was associated with the efficient reincorporation of Al species into the HTC framework.

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

2022

Kód důvěrnosti údajů

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

Název periodika

APPLIED CATALYSIS A-GENERAL

ISSN

0926-860X

e-ISSN

1873-3875

Svazek periodika

632

Číslo periodika v rámci svazku

25 February 2022

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

16

Strana od-do

"Article number 118482"

Kód UT WoS článku

000820844300001

EID výsledku v databázi Scopus

2-s2.0-85123640586