Demonstrates a novel bifunctional catalyst design that effectively abates ammonia emissions, indicating a sustainable approach for environmental control.
Ammonia (NH₃) slip from transportation and industrial sources contributes to secondary fine particulate matter formation and indirect greenhouse effects, posing growing environmental challenges. The selective catalytic oxidation (SCO) of NH₃ to N₂ offers an effective abatement route, yet conventional Pt-based catalysts suffer from high noble-metal demand and poor N₂ selectivity. Here, we report a bifunctional Pt0.08-Cu/AEI zeolite catalyst synthesized through a mechanochemical ball-milling strategy, which integrates Pt oxidation and Cu reduction functionalities within a single zeolitic framework. Structural analyses reveal that metallic Pt nanoparticles are located on the external surface, while atomically dispersed Cu²⁺ and CuOx clusters reside within the micropores, enabling intimate Pt-Cu interfacial coupling. Operando DRIFTS-MS results uncover a coupled SCO-SCR mechanism, where NO generated-on Pt sites reacts with adsorbed NH₃ on adjacent Cu Lewis acid sites to selectively produce N₂, effectively suppressing NOx and N₂O formation. Benefiting from this dual-site synergy, the Pt-Cu/AEI-BM1 catalyst with low-Pt content (0.08 wt %) achieves 90% NH₃ conversion and >90% N₂ selectivity at 200 °C under humid, high-space-velocity conditions. This study demonstrates a scalable and sustainable strategy for designing ultralow-Pt, high-selectivity catalysts for practical ammonia emission control.
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He et al. (2026) studied this question.
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