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

Result code in 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>

Alternative codes found

RIV/60461373:22320/25:43931608

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20400 - Chemical engineering

Project

<a href="/en/project/GA22-12925S" target="_blank" >GA22-12925S: Investigation of the key factors affecting hydrogenation/deoxygenation of mixtures of oxygenates</a><br>

Continuities

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

Publication year

2025

Confidentiality

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

Name of the periodical

Catalysis Today

ISSN

0920-5861

e-ISSN

1873-4308

Volume of the periodical

459

Issue of the periodical within the volume

1 November 2025

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

115404

UT code for WoS article

001506294100001

EID of the result in the Scopus database

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