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• W2072014105 abstract "The adsorption of CO and its reaction with NO in the 400–600 °C temperature range on Cen+/Na+/γ-Al2O3 and Pdn+/Cen+/Na+/γ-Al2O3 type materials used commercially as FCC additives were monitored by FTIR spectroscopy. Exposure of both types of samples to CO leads to the formation of carboxylates and carbonates. The concentration of these species was higher in samples containing Pd, indicating that palladium catalyzes their formation. The Pdn+ cations initially present in these samples undergo partial reduction to form metallic Pd in the presence of CO even at room temperature. More complete reduction of Pd, along with some aggregation, was observed after exposure to CO at elevated temperatures. Exposure of both types of samples to NO/CO mixtures in the 400–600 °C temperature range leads to the formation of surface isocyanate species. Both Na+ and Cen+ promote the formation of such NCO species. However, surface isocyanate species were formed with substantially higher rates in the presence of palladium. The formation of the isocyanate species strongly correlates with changes observed in the νOH region, indicating that hydroxyls actively participate in the surface chemistry involved and are capable of protonating the NCO species. The isocyanates are also reactive towards O2 and NO yielding CO2 and N2. These results suggest that isocyanates are possibly involved as intermediates in the CO–NO reaction over the materials examined." @default.
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• W2072014105 date "2007-09-30" @default.
• W2072014105 modified "2023-09-26" @default.
• W2072014105 title "In situ FTIR characterization of the adsorption of CO and its reaction with NO on Pd-based FCC low NOx combustion promoters" @default.
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• W2072014105 doi "https://doi.org/10.1016/j.cattod.2007.05.003" @default.
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