Single iron redox sites boost Methanol-SCR at low temperature.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41422082.
- Also identified by DOI 10.1038/s41467-025-67458-1 and PMC identifier 12824305.
- Licence recorded as CC BY-NC-ND.
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Abstract
Selective catalytic reduction of NO<sub>x</sub> to N<sub>2</sub> by methanol as a reducing agent presents a prospective solution for the removal of NO<sub>x</sub> from the exhaust of methanol engines and the coal-fired power plant, but it confronts the problem of insufficient deNO<sub>x</sub> activity at low temperatures (<350 °C). Here, we discover a strategy for boosting the activity of low-temperature Methanol-SCR by the collaboration of zeolitic acid sites with single iron redox sites. The further pilot-scale bench test using the coated monolithic catalyst also exhibits a remarkable NO<sub>x</sub> conversion and a high stability at low temperature. The location of different Fe sites in FER zeolite is identified by X-ray absorption spectroscopy, Mössbauer spectroscopy, as well as 2D <sup>1</sup>H-<sup>1</sup>H DQ MAS NMR technology. While the dynamic evolution of [FeO]<sup>+</sup> as the critical redox site for NO oxidation is successfully captured by in situ Mössbauer spectroscopy, which unravels the mechanism for the generation of key intermediate HONO on [FeO]<sup>+</sup> sites contributing the low-temperature Methanol-SCR activity. These results indicate the great potential application of Fe-FER zeolite catalyst in industrial Methanol-SCR and provide an atomic-level comprehension of how the dual-active-sites contribute to low-temperature Methanol-SCR activity.