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<p>The surface reactivity of methanol over model catalysts composed of Cu, Pt, and CuPt nanoparticles supported on {111}-faceted CeO<sub>2</sub> octahedra was investigated via <i>in-situ</i> DRIFTS. Characterization confirmed the formation of a Cu<sub>3</sub>Pt alloy, enhanced reducibility, and a stronger Pt-ceria interaction in the Cu<sub>4</sub>Pt<sub>1</sub>/Ce–O catalyst. Spectroscopically, Cu-containing samples exhibited a characteristic methoxy band (~ 2877&#xa0;cm<sup>−1</sup>). In the bimetallic catalyst, this band appeared red-shifted, evidencing electronic/geometrical modifications associated with a ligand effect that weakens the C-H bond. Furthermore, reactive interfacial Pt-ceria carbonyl species (~ 2017&#xa0;cm<sup>−1</sup>) were identified. Crucially, while unstable on monometallic Pt, these active sites were thermally stabilized up to 300℃ in the bimetallic system, correlated with its superior catalytic performance in methanol-involving reactions.</p> Graphic Abstract <p></p>

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Elucidating the active sites in CuPt/CeO2 model catalysts: A spectroscopic study on methanol reactivity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月12日

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  • Daniel G. Araiza,
  • Luis López-Rodríguez,
  • J. Manuel Mora-Hernández,
  • Antonio Gómez-Cortés,
  • Gabriela Díaz

摘要

The surface reactivity of methanol over model catalysts composed of Cu, Pt, and CuPt nanoparticles supported on {111}-faceted CeO2 octahedra was investigated via in-situ DRIFTS. Characterization confirmed the formation of a Cu3Pt alloy, enhanced reducibility, and a stronger Pt-ceria interaction in the Cu4Pt1/Ce–O catalyst. Spectroscopically, Cu-containing samples exhibited a characteristic methoxy band (~ 2877 cm−1). In the bimetallic catalyst, this band appeared red-shifted, evidencing electronic/geometrical modifications associated with a ligand effect that weakens the C-H bond. Furthermore, reactive interfacial Pt-ceria carbonyl species (~ 2017 cm−1) were identified. Crucially, while unstable on monometallic Pt, these active sites were thermally stabilized up to 300℃ in the bimetallic system, correlated with its superior catalytic performance in methanol-involving reactions.

Graphic Abstract