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• W2921097070 abstract "Abstract Commercial Cu/SAPO-34 selective catalytic reduction (SCR) catalysts have experienced unexpected and quite perplexing failure. Understanding the causes at an atomic level is vital for the synthesis of more robust Cu/SAPO-34 catalysts. Here we show, via application of model catalysts with homogeneously dispersed isolated Cu ions, that Cu transformations resulting from low-temperature hydrothermal aging and ambient temperature storage can be semi-quantitatively probed with 2-dimensional pulsed electron paramagnetic resonance. Coupled with kinetics, additional material characterizations and DFT simulations, we propose the following catalyst deactivation steps: (1) detachment of Cu(II) ions from cationic positions in the form of Cu(OH) 2 ; (2) irreversible hydrolysis of the SAPO-34 framework forming terminal Al species; and (3) interaction between Cu(OH) 2 and terminal Al species forming SCR inactive, Cu-aluminate like species. Especially significant is that these reactions are greatly facilitated by condensed water molecules under wet ambient conditions, causing low temperature failure of the commercial Cu/SAPO-34 catalysts." @default.
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• W2921097070 date "2019-03-08" @default.
• W2921097070 modified "2023-10-01" @default.
• W2921097070 title "Unraveling the mysterious failure of Cu/SAPO-34 selective catalytic reduction catalysts" @default.
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• W2921097070 doi "https://doi.org/10.1038/s41467-019-09021-3" @default.
• W2921097070 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6408507" @default.
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