Long-term stability of Au nanoparticles on rutile-like Ti1-xFexO2 solid solutions for low-temperature CO oxidation

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-01-09 DOI:10.1016/j.apcata.2025.120108

Franklin J. Méndez , Alejandro Herrera-González , Antonio Morales , Carlos Ángeles-Chávez , Amado F. García-Ruiz , Elim Albiter , Dora A. Solís-Casados , Xim Bokhimi

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引用次数: 0

Abstract

Rutile and Fe-doped rutile were synthesized at low temperatures to support Au NPs. Selected samples were characterized using XRD, SEM-EDS, HRTEM, STEM-HAADF, H₂-TPR, XPS, FTIR and DRIFT spectroscopy of adsorbed CO molecules. To enrich the interpretation, we performed DFT calculation on clusters of rutile, Fe-doped rutile and metallic gold interacting with CO molecules. Catalysts were tested in the CO oxidation reaction, focusing on the roles of activation-reaction time, Au loading, Fe-modification, and long-term aging on performance. Au-based Fe-doped rutile exhibited superior activity compared to the unmodified rutile catalyst. Long-term aging resulted in catalyst deactivation, but reactivation under hydrogen restored the high activity levels. Fe incorporation into rutile promoted the stabilization of the Au NPs by increasing the number of oxygen atoms on the surface, which act as pinning centers. This stabilization prevented the mobility and growth of the Au NPs, improving their dispersion.

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.