Structure-Activity Relationship in Ni/Al2O3–ZrO2–CeO2 Catalysts for Steam Reforming of Glycerol to Hydrogen-Enriched Syngas

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Abstract

Nickel catalysts for glycerol steam reforming suffer from rapid deactivation, hindering renewable hydrogen-rich syngas production. Herein, we address this by designing Ni/Al2O3–ZrO2–CeO2 (ACZ) catalysts where Al2O3 content (20 vs. 75 mol.%) tunes Ni dispersion and stability. At 600°C with a 9:1 molar H2O/glycerol ratio, Ni/75ACZ achieved 75% glycerol conversion and 50% H2 yield, maintaining stability over 7h. In contrast, Ni/20ACZ deactivated sharply (conversion dropped from 44 to 6%), attributed to sintering (Ni particle growth: from 30 to 34 nm) and amorphous carbon deposition (ID/IG = 1.2). The Ni/75ACZ sample formed graphitic coke (ID/IG = 1.0) that did not block active sites. This work demonstrates that Al2O3 enrichment stabilizes Ni against sintering and enables tolerance to amorphous carbon, offering a cost-effective strategy for durable glycerol reforming catalysts.

About the authors

Y. A Fionov

Peoples' Friendship University of Russia named after Patrice Lumumba

Email: fionovyuri@gmail.com
ORCID iD: 0000-0002-3495-5986
Department of physical and colloid chemistry Moscow, Russia

S. V Khaibullin

Peoples' Friendship University of Russia named after Patrice Lumumba

ORCID iD: 0009-0005-6116-1589
Department of physical and colloid chemistry Moscow, Russia

S. M Semenova

Peoples' Friendship University of Russia named after Patrice Lumumba

ORCID iD: 0009-0000-7484-1011
Department of physical and colloid chemistry Moscow, Russia

M. V Sykhrannova

Peoples' Friendship University of Russia named after Patrice Lumumba

ORCID iD: 0009-0002-5903-1058
Department of physical and colloid chemistry Moscow, Russia

I. I Mikhalenko

Peoples' Friendship University of Russia named after Patrice Lumumba

ORCID iD: 0000-0002-5406-1015
Department of physical and colloid chemistry Moscow, Russia

A. I Zhukova

Peoples' Friendship University of Russia named after Patrice Lumumba

Email: pylinina@list.ru
ORCID iD: 0000-0002-7399-2915
Department of physical and colloid chemistry Moscow, Russia

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