Year: 2026
Type: article
Abstract: The practical application of ammonia selective catalytic reduction (NH 3 -SCR) for stationary NO x abatement is severely restricted by rapid catalyst deactivation in flue gases containing SO 2 and alkali metal. Although coupling zeolites with transition-metal oxides improves poisoning tolerance, most adopted loading or confining strategies cannot simultaneously ensure high redox-site content and effective protection. Herein, we realize a zeolite-confined nanoreactor concept by constructing a yolk-shell catalyst, in which high-content (>10 wt.%) MnFeO x nanoparticles are confined within a hollow ZSM-5 single-crystal shell, with the zeolite framework fully preserved. In situ X-ray absorption fine structure (XAFS) and diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS), together with density functional theory (DFT) calculations, reveal a synergistic dual-shielding mechanism: the ZSM-5 shell physically hinders SO 2 from attacking the active oxide core, while external Brønsted acid sites chemically suppress SO 2 adsorption and intercept alkali metal. Consequently, the catalyst maintains >90% NO x conversion with high N 2 selectivity under co-poisoning by SO 2 and K. This work establishes hollow zeolite-confined nanoreactors as a versatile platform for designing durable emission-control catalysts, enabling stable long-term operation under industrially relevant multi-poisoning conditions.
Source: Nature Communications
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Awards: G1014745981, G15893672, G228232287, G2348478186, G2482929380, G3192578777, G3530399246, G3614389233, G4265792850, G4427435602, G4671606131, G4684642504, G4848727006, G504305494, G5264354833, G5317767138, G6122923183, G6574837499, G6600089673, G6824832713, G7386849049, G7451768318, G7710671968, G796692366, G8970268749, G949083970
OpenAlex ID: W7204491519