PO₄ ^3- Coordinated Robust Single-Atom Platinum Catalyst for Selective Polyol Oxidation

Area of Science:

• Heterogeneous catalysis
• Sustainable chemical synthesis
• Materials science

Background:

• Efficient catalytic conversion in aqueous solutions remains a challenge.
• Heterogeneous catalysts often suffer from leaching, impacting stability and sustainability.
• Selective oxidation of polyols requires robust catalytic systems.

Purpose of the Study:

• To develop a highly selective and stable heterogeneous catalyst for polyol oxidation in aqueous media.
• To investigate the mechanism behind the catalyst's enhanced performance and stability.
• To address the challenge of catalyst leaching in sustainable chemical synthesis.

Main Methods:

• Hydrothermal synthesis of single-atom platinum on hydroxyapatite (Pt1/HAP).
• Catalytic testing for selective oxidation of C2-C4 polyols.
• Characterization of catalyst structure and stability, including leaching resistance analysis.

Main Results:

• The Pt1/HAP catalyst demonstrated remarkable selectivity for converting polyols to hydroxy acids.
• The catalyst exhibited excellent stability, maintaining high efficiency for over 160 hours.
• The Pt-(O-P) linkage in the Pt1-OPO43- active site was identified as key to C-H bond activation and selectivity.
• Strong PO43- coordination provided electrostatic stabilization for single-atom platinum, preventing leaching.

Conclusions:

• The developed Pt1/HAP catalyst offers a robust and efficient solution for sustainable polyol oxidation in water.
• The unique active site structure and coordination effect are critical for achieving high selectivity and stability.
• This work presents a promising strategy for designing advanced heterogeneous catalysts with superior leaching resistance.