Investigating Ge-decorated phthalocyanine as a single atom catalyst for N₂O reduction: A DFT study.

Area of Science:

• Materials Science
• Computational Chemistry
• Environmental Catalysis

Background:

• Phthalocyanine (PhthC) derivatives are explored for catalytic applications.
• Nitrous oxide (N₂O) and carbon monoxide (CO) are significant environmental pollutants.
• Developing efficient catalysts for gas mitigation is crucial.

Purpose of the Study:

• To investigate the catalytic activity of Germanium-decorated phthalocyanine (Ge@PhthC) for N₂O reduction and CO oxidation.
• To understand the reaction mechanisms and energetics using theoretical calculations.
• To assess the potential of Ge@PhthC as an environmental remediation catalyst.

Main Methods:

• Spin-polarized Density Functional Theory (DFT) calculations were employed.
• Adsorption energies of Ge on PhthC and N₂O on the catalyst surface were determined.
• Reaction pathways and energy barriers for N₂O dissociation and CO oxidation were analyzed.

Main Results:

• Ge single atom preferentially occupies the divacancy site in phthalocyanine.
• Strong Ge adsorption energy (-6.66 eV) and moderate N₂O adsorption energy (-1.62 eV) were calculated.
• The N₂O reduction and CO oxidation proceed via a two-step mechanism.
• A low energy barrier (0.40 eV) was found for N₂O reduction by CO, indicating feasibility at normal conditions.

Conclusions:

• Ge@PhthC exhibits significant catalytic potential for N₂O reduction and CO oxidation.
• The catalyst facilitates the removal of toxic gases, N₂O and CO, especially in the presence of O₂.
• The findings suggest Ge@PhthC as a promising candidate for environmental applications in gas purification.