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- W4200589320 abstract "Abstract Commercial Cu-exchanged small-pore SSZ-13 (Cu-SSZ-13) zeolite catalysts are highly active for the selective catalytic reduction (SCR) of NO x with NH 3 , but distinct from other catalyst systems, their activity is unexpectedly inhibited in the presence of NO 2 . Here, we combined kinetic experiments, in-situ/operando X-ray absorption spectroscopy, and density functional theory (DFT) calculations to obtain direct evidence that under reaction conditions, strong oxidation by NO 2 forces Cu ions to exist mainly as fixed framework Cu 2+ species (fw-Cu 2+ ), which impede the formation of dynamic binuclear Cu + species that serve as the main active sites for the standard SCR (SSCR) reaction. As a result, the SSCR reaction is significantly inhibited by NO 2 in the zeolite system, and the NO 2 -involved SCR reaction occurs with an energy barrier higher than that of the SSCR reaction on dynamic binuclear sites. Moreover, the NO 2 -involved SCR reaction tends to occur at the Brønsted acid sites (BAS) rather than the fw-Cu 2+ sites. This work clearly explains the strikingly distinctive selective catalytic behavior in the zeolite system." @default.
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- W4200589320 date "2021-11-30" @default.
- W4200589320 modified "2023-10-18" @default.
- W4200589320 title "Strikingly Distinctive NH3-SCR Behavior over Cu-SSZ-13 in the Presence of NO2" @default.
- W4200589320 doi "https://doi.org/10.21203/rs.3.rs-1092067/v1" @default.
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