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- W2053792751 abstract "Sequential adsorption of CO and NO as well as equimolar NO + CO reaction with variation of temperature over Pd2+ ion–substituted CeO2 and Ce0.75Sn0.25O2 supports has been studied by DRIFTS technique. The results are compared with 2 at.% Pd/Al2O3 containing Pd0. Both linear and bridging Pd0–CO bands are observed over 2 at.% Pd/Al2O3. But, band positions are shifted to higher frequencies in Ce0.98Pd0.02O2−δ and Ce0.73Sn0.25Pd0.02O2−δ catalysts that could be associated with Pdδ+–CO species. In contrast, a Pd2+–CO band at 2160 cm−1 is observed upon CO adsorption over Ce0.98Pd0.02O2−δ and Ce0.73Sn0.25Pd0.02O2−δ catalysts pre-adsorbed with NO and a Pd+–CO band at 2120 cm−1 is slowly developed on Ce0.73Sn0.25Pd0.02O2−δ over time. An intense linear Pd0–NO band at 1750 cm−1 found upon NO exposure to CO pre-adsorbed 2 at.% Pd/Al2O3 indicates molecular adsorption of NO. On the other hand, a weak Pd2+–NO band at 1850 cm−1 is noticed after NO exposure to Ce0.98Pd0.02O2−δ catalyst pre-adsorbed with CO indicating dissociative adsorption of NO which is crucial for NO reduction. Pd0–NO band is initially formed over CO pre-adsorbed Ce0.73Sn0.25Pd0.02O2−δ which is red-shifted over time along with formation of Pd2+–NO band. Several intense bands related to nitrates and nitrites are observed after exposure of NO to fresh as well as CO pre-adsorbed Ce0.98Pd0.02O2−δ and Ce0.73Sn0.25Pd0.02O2−δ catalysts. Ramping the temperature in a DRIFTS cell upon NO and CO adsorption shows the formation of N2O and NCO surface species, and N2O-formation temperature is comparable with the reaction done in a reactor." @default.
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- W2053792751 date "2013-07-01" @default.
- W2053792751 modified "2023-10-02" @default.
- W2053792751 title "DRIFTS studies on CO and NO adsorption and NO+CO reaction over Pd2+-substituted CeO2 and Ce0.75Sn0.25O2 catalysts" @default.
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- W2053792751 doi "https://doi.org/10.1016/j.jcat.2013.03.020" @default.
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