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CO combustion on supported gold clusters.

Matthias Arenz¹, Uzi Landman, Ueli Heiz

¹Lehrstuhl für Physikalische Chemie I, Technische Universität München Lichtenbergstrasse 4, 85747 Garching, Germany.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|August 2, 2006

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Gold clusters catalyze carbon monoxide combustion. Reactivity depends on support, defects, water, and cluster size, with mechanisms varying at the molecular level.

Area of Science:

Heterogeneous catalysis
Nanoparticle chemistry
Surface science

Background:

Supported gold nanoparticles exhibit unique catalytic properties.
Understanding the molecular-level mechanisms of CO combustion is crucial.
The non-scalable properties of small gold clusters present unique challenges.

Purpose of the Study:

To summarize recent advancements in understanding CO combustion catalysis by supported gold.
To elucidate the factors controlling gold cluster reactivity at the molecular level.
To explore the reaction mechanisms for different gold cluster-support systems.

Main Methods:

Focus on size-selected gold clusters (few-atom regime).
Investigate the roles of oxide support, defects, cluster charging, and water.

Related Experiment Videos

Combine experimental data with quantum mechanical ab initio calculations.

Main Results:

Detailed reaction mechanisms for CO combustion by small gold clusters emerge.
Factors influencing reactivity include support, defects, charging, fluxionality, size, and water.
Mechanisms differ across various systems (cluster size, support, conditions).

Conclusions:

No single generalized explanation for the catalytic activity of small gold particles.
Reactivity is highly system-specific, depending on multiple molecular-level factors.
Further research is needed to fully understand the nuances of gold catalysis.