2026-10-10T22:14:20Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34037902 2026-10-01T03:06:17Z category_1 category_915 category_24 category_873 category_39 category_46 portal_63 item_type_6 month_year_10_2026

Metal-Induced Localized Microcrystals Buffer Poisoning in NO_x Catalytic Reduction Lijun Yan (1352910) Guang Yan (311657) Li Chen (5749) Jun Liu (42548) Zhenyang Tao (22288681) Mzamo Shozi (25150987) Jiang Deng (1708582) Dengsong Zhang (1366407) Biophysics Physical Sciences not elsewhere classified Evolutionary Biology Chemical Sciences not elsewhere classified Ecology Immunology systematic investigation reveals migration pathway drives inducing localized microcrystallization fundamentally resolving poisoning fabricating amorphous high extra active centers disordered metastable state adsorbed nitrates undergoes active defense mechanism sequestering metal poisons accommodating metal posions x </ sub 3 </ sub 2 </ sub traditional acid sufficient supply subsequently transformed study establishes structural evolution stable bidentate service life scr reaction sacrificial sites resulting microcrystals abatement catalysts Metal impurities in flue gas severely threaten the service life of NO_x abatement catalysts. While traditional acid-base interaction strategies rely on sacrificial sites, such passive defense mechanisms merely mitigate activity loss rather than fundamentally resolving poisoning. This study establishes an active defense mechanism by fabricating amorphous high-entropy metal oxides capable of sequestering metal poisons by inducing localized microcrystallization. These resulting microcrystals are subsequently transformed into extra active centers for NO_x reduction. Systematic investigation reveals that the K-migration pathway drives a structural evolution from a disordered metastable state to locally ordered nanocrystalline regions, significantly enhancing lattice oxygen mobility. This transition facilitates the activation of NH₃ into O-NH₂^– intermediates. Furthermore, the coordination of surface-adsorbed nitrates undergoes a transition from stable bidentate to easily decomposable monodentate configurations, ensuring a sufficient supply of NO₂ species for the fast-SCR reaction. Consequently, NO_x conversion is unexpectedly enhanced following metal poisoning. This strategy increases poisoning resistance by accommodating metal posions and constructing new active sites in situ. 2026-09-30T00:00:00Z Text Journal contribution 10.1021/acs.est.6c09247.s001 https://figshare.com/articles/journal_contribution/Metal-Induced_Localized_Microcrystals_Buffer_Poisoning_in_NO_sub_x_sub_Catalytic_Reduction/34037902 CC BY-NC 4.0