Modulator-free approach towards missing-cluster defect formation in Zr-based UiO-66

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Zirconium-based UiO-66 metal-organic frameworks (MOFs) are widely studied for catalytic applications.
• Controlling defects in MOFs is crucial for tuning their properties.
• Existing methods for defect generation often require harsh conditions or specific modulators.

Purpose of the Study:

• To develop a novel method for generating missing-cluster defects in UiO-66.
• To investigate the impact of these defects on pore structure.
• To evaluate the effect of defect-induced hierarchical pores on catalytic performance.

Main Methods:

• Rigorous control of water content during the synthesis of Zr-based UiO-66.
• Characterization of defect structures and pore architectures using advanced techniques.
• Assessment of catalytic activity using relevant chemical reactions.

Main Results:

• Successfully generated missing-cluster defects in UiO-66 to a remarkable extent.
• Demonstrated the formation of hierarchical pore structures due to these defects.
• Observed a profound positive effect of hierarchical pores on catalytic performance.

Conclusions:

• Water content is a key parameter for defect engineering in UiO-66.
• Missing-cluster defects can create beneficial hierarchical porosity.
• This defect engineering approach offers a new pathway for enhancing MOF catalytic activity.