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Heterogeneous Catalysis

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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A Heterometallic Metal-Organic Framework with Atomically Precise Single-Cu Sites for Photocatalysis.

Jingjing Yuan¹, Huawei Lin¹, Zhiyou Yu¹

¹Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, China.

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Summary

Researchers developed a novel strategy to create precisely structured single-atom catalysts (SACs) by reorganizing metal clusters. This method yields highly efficient catalysts for C(sp3)-H functionalization, advancing catalyst design and application.

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Area of Science:

Materials Science
Catalysis
Nanotechnology

Background:

Atomically precise single-atom catalysts (SACs) are crucial for understanding structure-activity relationships in catalysis.
Synthesizing SACs with well-defined coordination environments remains a significant synthetic challenge.

Purpose of the Study:

To develop a new synthetic strategy for creating SACs with atomically resolved coordination microenvironments.
To investigate the application of these SACs in photocatalytic C(sp3)-H functionalization.

Main Methods:

A secondary building unit (SBU) deconstruction-reorganization strategy was employed.
The dicopper cluster in Cu2(TCA)4/3 was converted into a Y4(μ3-OH)4Cu2(COO)12 heterometallic cluster using Y3+ and a modulator.
Single-crystal X-ray diffraction was used to characterize the structural transformation and the resulting framework (CCNUF-51).

Main Results:

The reorganization expanded the Cu-Cu distance and generated isolated square CuO4 sites within the CCNUF-51 framework.
CCNUF-51 exhibits excellent chemical stability across a wide pH range (2-12).
The SACs demonstrated high efficiency in photocatalytic benzylic C(sp3)-H functionalization, outperforming existing catalysts.

Conclusions:

SBU deconstruction-reorganization is an effective method for synthesizing SACs with atomically defined active sites.
The developed SACs show significant promise for advanced photocatalytic applications.
This work provides a new avenue for designing and fabricating advanced catalytic materials.