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Engineering PdAu/CeO₂ Alloy/Oxide Interfaces for Selective Methane-to-Methanol Conversion with Water.

Estefanía Fernández-Villanueva^1,2,3, Pedro J Ramírez^4,5, Pablo G Lustemberg²

¹Universitat Politècnica de València, Camí de Vera s/n, Valencia, 46022, Spain.

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Summary

This summary is machine-generated.

This study introduces PdAu/CeO2 catalysts for selective methane-to-methanol conversion using water. The alloy catalyst prevents over-reaction, achieving high methanol selectivity under mild conditions.

Keywords:

Alloy–oxide interface DFT calculations Methane‐to‐methanol conversion PdAu/CeO2 catalyst XPS characterization

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Area of Science:

Catalysis
Materials Science
Chemical Engineering

Background:

Direct methane-to-methanol conversion is a key challenge in methane valorization.
Existing catalysts often suffer from over-reaction, leading to low methanol selectivity.

Purpose of the Study:

To investigate the role of PdAu/CeO2 catalysts in selective methane conversion to methanol.
To understand the mechanism of enhanced selectivity using water as the sole oxidant.

Main Methods:

Experimental techniques including X-ray Photoelectron Spectroscopy (XPS) and catalytic testing.
Density Functional Theory (DFT) calculations to elucidate reaction mechanisms.

Main Results:

A Pd0.3Au0.7/CeO2 catalyst with isolated Pd atoms achieved ~80% methanol selectivity at 500 K.
PdAu/CeO2 demonstrated a synergistic effect, balancing methane activation and methanol formation.
DFT confirmed isolated Pd sites at the alloy/oxide interface are crucial for selectivity.

Conclusions:

Alloying Pd with Au on CeO2 effectively suppresses methanol over-decomposition.
The PdAu/CeO2 catalyst design highlights the importance of alloy/oxide interfaces for selective methane conversion.
This work provides insights for developing efficient catalysts for methanol synthesis.