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- W2032062140 abstract "Abstract A series of Ba/CeO 2 catalysts with different Ba loading amounts were prepared by incipient wetness impregnation. Their NO x adsorption behaviors under NO and NO+O 2 conditions were investigated by in situ DRIFTS. It was found that NO x was adsorbed and stored in the form of nitrites and nitrates on both Ba and Ce sites on the surface of the catalysts. The less thermally stable BaCO 3 was suggested to be the main active phase for NO x trapping. Ceria served primarily as an oxygen supplier in the absence of O 2 , and the reaction from nitrites to nitrates on Ba sites was the key step in this case. In the presence of O 2 , however, gaseous O 2 became the main oxygen source. The NO x adsorption capacity of the catalyst was dominated by the Ba content. Moreover, the stability of nitrites and nitrates formed on Ce sites was found to be lower than those formed on Ba sites which existed in the form of the ionic barium nitrate species." @default.
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- W2032062140 date "2013-11-01" @default.
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- W2032062140 title "In situ DRIFTS study of NOx adsorption behavior on Ba/CeO2 catalysts" @default.
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- W2032062140 doi "https://doi.org/10.1016/s1002-0721(12)60406-2" @default.
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