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- W2206002113 abstract "An Al-rich Co-BEA∗ zeolite (Si/Al 4.2, Co/Al 0.5) was prepared by organotemplate-free hydrothermal synthesis and [Co(II)(H2O)6]2+ ion exchange. The structure of the Co species and their activity in C3H8–SCR-NOx were compared to that of Si-rich Co-BEA∗ (Si/Al 11.3). The high population of AlSiAl sequences in Al-rich BEA∗ with AlO4− facing different channels, contrary to their absence in Si-rich BEA∗, results in dehydrated Co-BEA∗ in easily reducible counter-ion [Co(III)O]+ species attached to one AlO4−. The high concentration and density of these Co-oxo species in Al-rich Co-BEA∗ facilitates extra-ordinarily high SCR-NOx rate even under water vapor up to 10 vol.%, twelve-times outperforming Si-rich Co-BEA∗. The five-to-six times increased TOF and easier reducibility suggest a synergetic redox effect of water-resistant Co-oxo species. The Al-rich Co-BEA∗ provides the highest reaction rate at conditions of wet NOx streams, exceeding that previously reported for metal ion/oxo zeolite catalysts, with a high selectivity to molecular nitrogen and efficient utilization of propane." @default.
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- W2206002113 date "2015-12-01" @default.
- W2206002113 modified "2023-10-07" @default.
- W2206002113 title "Unprecedented propane–SCR-NO x activity over template-free synthesized Al-rich Co-BEA ∗ zeolite" @default.
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- W2206002113 doi "https://doi.org/10.1016/j.jcat.2015.10.007" @default.
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