Efficient Photocatalytic Propane Direct Dehydrogenation to Propylene Over PtO₂ Clusters

Area of Science:

• Catalysis
• Materials Science
• Photochemistry

Background:

• Direct dehydrogenation of alkanes to olefins is difficult due to inert C-H bonds.
• Mild reaction conditions are desired for energy efficiency and sustainability.

Purpose of the Study:

• To develop an efficient photocatalytic system for propane direct dehydrogenation (PDH) to propylene.
• To investigate the synergistic effects between catalyst components for enhanced performance.

Main Methods:

• Synthesis of PtO2 clusters immobilized on ZnO/Al2O3 support (LD-Pt_n).
• Photocatalytic dehydrogenation experiments under UV irradiation (365 nm).
• Characterization using control experiments and density functional theory (DFT) calculations.

Main Results:

• Achieved a propylene production rate of nearly 1 mmol g^-1 h^-1.
• Obtained nearly 100% selectivity for propylene.
• Demonstrated efficient C-H bond activation via photogenerated holes at PtO2/ZnO interfaces.

Conclusions:

• The LD-Pt_n photocatalyst shows excellent performance for PDH.
• Synergism between ZnO and Pt species is crucial for the high catalytic activity.
• This work presents a promising new pathway for direct olefin production from alkanes.