Evaluation of anisole hydrodeoxygenation reaction pathways over a Ni/Al2O3 catalyst

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F24%3A10255231" target="_blank" >RIV/61989100:27710/24:10255231 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22320/24:43928935

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0021951724002665?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0021951724002665?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jcat.2024.115553" target="_blank" >10.1016/j.jcat.2024.115553</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of anisole hydrodeoxygenation reaction pathways over a Ni/Al2O3 catalyst

Popis výsledku v původním jazyce

Anisole is a model molecule for studying hydrodeoxygenation (HDO) of lignin-derived oxygenates. Here we elucidate its HDO pathway over 10 % Ni/Al2O3 catalyst. Adsorption experiments showed that anisole is adsorbed on the acidic sites of the Al2O3. Anisole adsorption at 200-300 oC is reactive in nature, and results in its demethylation. The catalyst was tested at 100-300 oC, 5-40 bar H2 pressure. Conversion of 78 % was obtained at 5 bar and 300 oC, restricted by hydrogenation-dehydrogenation equilibrium. HDO mainly starts through the ring-hydrogenation pathway. This is followed by demethoxylation beyond 180 oC. At 5-12 bar, cyclohexane dehydrogenates to benzene. This was confirmed by conducting an HDO experiment with methoxycyclohexane. At lower pressure deoxygenation is favored; and demethylation is accompanied with methylation of the aromatic ring, for temperature &gt;260 oC. Investigation of the initial reaction stages showed that anisole HDO on Ni/Al2O3 catalyst proceeds via two independent pathways i.e., reactive adsorption/(de)methylation and aromatic ring hydrogenation.

Název v anglickém jazyce

Evaluation of anisole hydrodeoxygenation reaction pathways over a Ni/Al2O3 catalyst

Popis výsledku anglicky

Anisole is a model molecule for studying hydrodeoxygenation (HDO) of lignin-derived oxygenates. Here we elucidate its HDO pathway over 10 % Ni/Al2O3 catalyst. Adsorption experiments showed that anisole is adsorbed on the acidic sites of the Al2O3. Anisole adsorption at 200-300 oC is reactive in nature, and results in its demethylation. The catalyst was tested at 100-300 oC, 5-40 bar H2 pressure. Conversion of 78 % was obtained at 5 bar and 300 oC, restricted by hydrogenation-dehydrogenation equilibrium. HDO mainly starts through the ring-hydrogenation pathway. This is followed by demethoxylation beyond 180 oC. At 5-12 bar, cyclohexane dehydrogenates to benzene. This was confirmed by conducting an HDO experiment with methoxycyclohexane. At lower pressure deoxygenation is favored; and demethylation is accompanied with methylation of the aromatic ring, for temperature &gt;260 oC. Investigation of the initial reaction stages showed that anisole HDO on Ni/Al2O3 catalyst proceeds via two independent pathways i.e., reactive adsorption/(de)methylation and aromatic ring hydrogenation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

<a href="/cs/project/GA22-12925S" target="_blank" >GA22-12925S: Studium klíčových faktorů ovlivňujících hydrogenaci/deoxygenaci směsí kyslíkatých látek</a><br>

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

Journal of Catalysis

ISSN

0021-9517

e-ISSN

—

Svazek periodika

435

Číslo periodika v rámci svazku

5/2024

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

nestránkováno

Kód UT WoS článku

001245921600001

EID výsledku v databázi Scopus

2-s2.0-85193803665