Plasma electrolytic oxidation porous titanium dioxide coatings as superior catalyst supports for efficient carbon monoxide catalytic oxidation

Abstract

Carbon monoxide (CO) is among the most toxic gases found in the atmosphere, posing significant health and environmental risks. The CO catalytic oxidation at low temperatures represents an efficient, eco-friendly, and cost-effective technology for the removal of CO, converting it into carbon dioxide (CO₂). While various catalysts have been employed in CO catalytic converters, noble metal catalysts remain prohibitively expensive and scarce. Additionally, non-noble metal catalysts often exhibit suboptimal activity and weak long-term stability. To address these challenges, a promising approach involves supporting catalytically active materials on porous oxide layers with strong adhesion to metallic substrates. Plasma electrolytic oxidation (PEO) emerges as a viable, straightforward, and rapid coating technique for creating highly adherent, ceramic-like porous oxide layers. PEO coatings can serve as superior catalyst supports, enabling the deposition of highly active and stable catalysts for CO oxidation reactions. This review underscores the advantages of PEO coatings and provides insights into the synthesis pathways for achieving effective CO catalytic oxidation. By leveraging PEO technology, researchers can enhance both activity and long-term stability while minimizing overall catalyst fabrication costs.