Visualization of Co-O/N Sites under a Confined Combustion Strategy for Oxidation Reactions

Area of Science:

• Materials Science
• Catalysis
• Surface Chemistry

Background:

• Catalyst structure-activity relationships are key in thermal fields.
• Understanding metal site formation and excitation is crucial.

Purpose of the Study:

• To synthesize and characterize nitrogen-doped cobalt oxide (Co3O4) catalysts.
• To investigate the effect of nitrogen doping on catalytic activity and performance.

Main Methods:

• Confined combustion synthesis strategy.
• Nitrogen doping to regulate Co-O coordination structure.
• Thermal analysis kinetics and wavelet transforms for site evolution analysis.

Main Results:

• Co3O4 (PC-345) exhibited high catalytic activity for ethane (T90% = 218 °C) and propylene (T90% = 176 °C).
• Nitrogen doping enhanced oxygen vacancy generation and improved electron availability, charge transfer, and catalytic sites.
• Co-O/N sites facilitated water molecule migration by lowering energy barriers.

Conclusions:

• Nitrogen doping in Co3O4 effectively enhances low-temperature catalytic performance.
• In situ thermal control and Co-O/N site mediation are vital for efficient catalyst development.
• The study highlights the importance of understanding catalyst evolution under thermal conditions.