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- W2904690815 abstract "We have recently demonstrated that divalent copper ions exchanged into the large-pore zeolite UZM-35 with MSE topology (Cu-UZM-35) when hydrothermally aged at 750 °C exhibit a considerably wider operating temperature window for NH3-SCR than those into the small-pore zeolite SSZ-13 with CHA topology (Cu-SSZ-13), the current commercial catalyst for this reaction. Here we report the physical states and locations of copper ions in the fresh and 750 °C aged forms of Cu-UZM-35 determined using quantitative EPR measurements and synchrotron powder X-ray diffraction and Rietveld analyses. Among the four different cation sites (Cu1–Cu4) identified in fresh Cu-UZM-35, sites Cu3 and Cu4 are easily accessible via 12-ring and 10-ring channels, respectively, allowing their copper ions to serve as the main active sites for NH3-SCR. It was also found that while the Cu2+ ions at site Cu3 remain unchanged even after hydrothermal aging at 750 °C, the [Cu(OH)]+ ions at site Cu4 are transformed into CuOx and/or CuAl2O4 species..." @default.
- W2904690815 created "2018-12-22" @default.
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- W2904690815 date "2018-12-07" @default.
- W2904690815 modified "2023-09-25" @default.
- W2904690815 title "Extraframework Cation Locations in Cu-UZM-35 NH<sub>3</sub>-SCR Catalyst" @default.
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- W2904690815 doi "https://doi.org/10.1021/acs.jpcc.8b09764" @default.
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