Supported cluster catalysts synthesized to be small, simple, selective, and stable

Area of Science:

• Heterogeneous catalysis
• Materials science
• Nanotechnology

Background:

• Supported molecular metal complexes are crucial catalysts for precise synthesis.
• Research is advancing beyond single metal atoms to more complex supported clusters.

Purpose of the Study:

• Highlight advances in supported noble metal and metal oxide clusters as catalysts.
• Emphasize precisely synthesized, well-defined cluster catalysts.
• Discuss fundamental understanding and expansion of these catalytic materials.

Main Methods:

• Precise synthesis using organometallic precursors.
• Characterization via spectroscopic, microscopic, and theoretical methods.
• Investigation of metal clusters (e.g., pair-site catalysts) and metal oxide clusters (e.g., Zr6O8).

Main Results:

• Supported metal clusters exhibit reactivities dependent on nuclearity, ligands, and supports.
• Metal oxide clusters, like Zr6O8 nodes in MOFs, show distinct surface chemistry from bulk materials.
• Encapsulation in zeolites effectively prevents sintering of supported metal nanoparticles.

Conclusions:

• Precisely synthesized supported clusters represent a significant advancement in catalysis.
• Understanding structure-function relationships is rapidly progressing.
• Zeolite encapsulation offers a robust solution to sintering challenges in supported cluster catalysts.