Exploring Si-centered phthalocyanine as a single atom catalyst for N₂O reduction: a DFT study

Area of Science:

• Catalysis
• Environmental Chemistry
• Materials Science

Background:

• Greenhouse gas N₂O removal is critical.
• Single-atom catalysts (SACs) show promise for environmental remediation.
• Novel, cost-effective catalysts are needed.

Purpose of the Study:

• Investigate N₂O reduction pathways on Si-coordinated phthalocyanine (Si@PthC).
• Evaluate the catalytic activity and stability of Si@PthC.
• Explore potential for noble metal-free N₂O elimination catalysts.

Main Methods:

• Density functional theory (DFT) calculations.
• Analysis of reaction pathways and energy barriers.
• Investigation of adsorption energies and electronic properties.

Main Results:

• Si@PthC is energetically stable with Si as the active site.
• Spontaneous N₂O dissociation from the O-end (-4.01 eV).
• N₂O dissociation via N-end has a low energy barrier (0.51 eV).
• CO and O₂ co-adsorption does not impede N₂O reduction.
• Catalyst regeneration via CO oxidation is highly efficient (0.37 eV barrier).

Conclusions:

• Si@PthC demonstrates excellent catalytic performance for N₂O reduction.
• The catalyst is stable and resistant to poisoning by CO and O₂.
• This study highlights Si@PthC as a promising noble metal-free catalyst for N₂O abatement.