Hydrodeoxygenation of guaiacol and anisole over alumina supported monometallic Ni and Cu catalysts: Studies on the effect of metal sites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F25%3A10258497" target="_blank" >RIV/61989100:27710/25:10258497 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22320/25:43931608

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0920586125002226?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0920586125002226?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2025.115404" target="_blank" >10.1016/j.cattod.2025.115404</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hydrodeoxygenation of guaiacol and anisole over alumina supported monometallic Ni and Cu catalysts: Studies on the effect of metal sites

Popis výsledku v původním jazyce

Valorization of lignin-derived phenolics by hydrodeoxygenation (HDO) poses two major challenges. The first one is the reduction of oxygen content and the second one is to prevent the loss of C atoms from the feedstock while removing oxygen atoms in,-OCH3 groups. In this study, Ni/Al2O3 catalysts were found to be efficient for deoxygenation, and Cu/Al2O3 catalysts were used to selectively carry out reactions intended toward preventing C losses. HDO over Ni/Al2O3 catalysts resulted in the hydrogenation of the aromatic ring of guaiacol and anisole, followed by demethoxylation, as the major reaction pathway. The demethoxylation reaction was favored at lower H2 pressure. However, at lower pressure catalytic deactivation and the nonlinear Arrhenius nature of the aromatic ring hydrogenation limited guaiacol and anisole conversions at higher temperatures. It was found that with the increase in Ni loading the overall conversion was maximum at 10 wt% Ni. Since the demethoxylation reaction occurred only after aromatic ring hydrogenation, its rate showed a similar dependence on both Ni loading and reaction temperature as that of hydrogenation. In this work, (de)methylation reactions of guaiacol and anisole were carried out selectively over Cu/Al2O3 catalysts. Adsorption studies showed that alumina sites were responsible for the reactive adsorption which gave rise to the (de)methylation reactions; and the Cu sites further enhanced these reactions, especially at higher H2 pressures. We have achieved about 65 % molar conversion of guaiacol selectively towards the formation of catechol, phenol, and methylated catechols/phenols, accompanied by small quantities of toluene and xylenes.

Název v anglickém jazyce

Hydrodeoxygenation of guaiacol and anisole over alumina supported monometallic Ni and Cu catalysts: Studies on the effect of metal sites

Popis výsledku anglicky

Valorization of lignin-derived phenolics by hydrodeoxygenation (HDO) poses two major challenges. The first one is the reduction of oxygen content and the second one is to prevent the loss of C atoms from the feedstock while removing oxygen atoms in,-OCH3 groups. In this study, Ni/Al2O3 catalysts were found to be efficient for deoxygenation, and Cu/Al2O3 catalysts were used to selectively carry out reactions intended toward preventing C losses. HDO over Ni/Al2O3 catalysts resulted in the hydrogenation of the aromatic ring of guaiacol and anisole, followed by demethoxylation, as the major reaction pathway. The demethoxylation reaction was favored at lower H2 pressure. However, at lower pressure catalytic deactivation and the nonlinear Arrhenius nature of the aromatic ring hydrogenation limited guaiacol and anisole conversions at higher temperatures. It was found that with the increase in Ni loading the overall conversion was maximum at 10 wt% Ni. Since the demethoxylation reaction occurred only after aromatic ring hydrogenation, its rate showed a similar dependence on both Ni loading and reaction temperature as that of hydrogenation. In this work, (de)methylation reactions of guaiacol and anisole were carried out selectively over Cu/Al2O3 catalysts. Adsorption studies showed that alumina sites were responsible for the reactive adsorption which gave rise to the (de)methylation reactions; and the Cu sites further enhanced these reactions, especially at higher H2 pressures. We have achieved about 65 % molar conversion of guaiacol selectively towards the formation of catechol, phenol, and methylated catechols/phenols, accompanied by small quantities of toluene and xylenes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20400 - Chemical 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

2025

Kód důvěrnosti údajů

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

Název periodika

Catalysis Today

ISSN

0920-5861

e-ISSN

1873-4308

Svazek periodika

459

Číslo periodika v rámci svazku

1 November 2025

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

115404

Kód UT WoS článku

001506294100001

EID výsledku v databázi Scopus

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