Typically, to meet emission regulations, the selective catalytic reduction of NO_X with NH₃ (NH₃-SCR) technology cause NH₃ emissions owing to high NH₃/NO_X ratios to meet emission regulations. In this study, V-Cu/BN-Ti was used to remove residual NO_X and NH₃. Catalysts were evaluated for selective catalytic oxidation of NH₃ (NH₃-SCO) in the NH₃-SCR reaction at 200–300 °C. The addition of vanadium and copper increased the number of Brønsted and Lewis acid sites available for the reaction by increasing the ratio of V⁵⁺ and forming Cu⁺ species, respectively. Furthermore, h-BN was dispersed in the catalyst to improve the content of vanadium and copper species on the surface. NH₃ and NO_X conversion were 98% and 91% at 260 °C, respectively. Consequently, slipped NH₃ (NH₃-Slip) emitted only 2% of the injected ammonia. Under SO₂ conditions, based on the NH₃ oxidation reaction, catalytic deactivation was improved by addition of h-BN. This study suggests that h-BN is a potential catalyst that can help remove residual NO_X and meet NH₃ emission regulations when placed at the bottom of the SCR catalyst layer in coal-fired power plants.

Nitrous oxide (N₂O) is a potent greenhouse gas with a global warming potential > 310 times that of CO₂. Owing to its rapid increase in atmospheric concentrations from industrial emissions, N₂O poses increasing environmental concerns. Among the various N₂O abatement technologies, catalytic decomposition can directly convert N₂O into harmless N₂ and O₂ without generating secondary pollutants. In this study, Co₃O₄ spinel catalysts were synthesized using a polymer-assisted precipitation method, using polyvinyl alcohol, polyvinylpyrrolidone, or polyethylene glycol (PEG) as N₂O decomposition catalysts. The PEG-mediated synthesis method yielded the most active catalyst with superior N₂O decomposition efficiency. Structural and surface analyses confirmed that PEG facilitated the formation of Co²⁺-enriched surface sites and abundant oxygen vacancies, which are crucial active sites for N₂O adsorption and activation. Moreover, these features improved the redox properties and electron transfer behavior of the resulting catalyst. In particular, the PEG-derived 5Co₃O₄/CeO₂ catalyst exhibited enhanced N₂O decomposition activity and stability even in the presence of coexisting N₂O and O₂, highlighting its potential for real-world applications. This study provides an effective synthetic route for Co₃O₄-based catalysts and potential opportunities for wide applications in industrial N₂O removal.

This study investigates the catalytic activity and surface behaviors of V₂O₅ catalysts modified with promoter components to improve low-temperature activity and suppress SO₂-to-SO₃ oxidation. Moreover, we fabricated corrugated-type catalysts using glass fiber sheets as substrates, because powdered catalysts revealed limitations for practical applications. The modified catalysts were prepared via a slurry mixing method using vanadium precursor with different promoters such as W, Nb, Zr, Mo, Ce, Fe supported on TiO₂. The catalysts were fabricated into slurry coating type catalysts using glass fiber sheets and the catalytic activity, specific surface area, and acid sites were investigated. The performance of corrugated-type catalyst and oxidation of SO₂ to SO₃ over a wide temperature range were evaluated using a Micro-Reactor. Our results showed that adding a promoter improves the catalytic performance of VW/Ti catalysts by enhancing surface acidity. The results varied depending on the catalyst loading and promoter components over a wide temperature range. Among them, VWNb/Ti catalysts exhibited the highest NOx conversion of 80.9% at 350 °C despite the high gaseous velocity (AV of 51 m·h⁻¹) and the large flow rate of 20 L·min⁻¹, with the lowest Ea of 13.7 kJ·mol⁻¹. Among the evaluated promoters, Nb exhibited the most favorable balance of activity and SO₂-to-SO₃ oxidation. These results suggest that the Nb modification strategy can be extended to commercial SCR catalysts, providing a practical approach for improving catalytic performance.