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Role and distribution of different Ba-containing phases in supported Pt–Ba NSR catalysts

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Pt–Ba/MeO (where MeO = Al2O3, CeO2, SiO2 and ZrO2) NO x storage-reduction catalysts with Ba-loading varying from 0 wt.% to 28 wt.% were investigated concerning stability of Ba phases and NO x storage-reduction efficiency. For Pt–Ba/Al2O3 three different Ba-containing phases with different thermal stability are distinguished based on their interaction with the support. The relative concentration of these phases varies with the Ba-loading and NO x storage tests indicated that the BaCO3 phase decomposing between 400 °C and 800 °C (LT-BaCO3) is the most efficient Ba containing phase for NO x storage. Similar investigations of Pt–Ba catalysts supported on CeO2, SiO2 and ZrO2 showed that the relative amount of LT-BaCO3 phase depends also on the support material. NO x storage measurements confirmed a correlation between the concentration of LT-BaCO3 and NO x storage efficiency. Basicity and textural properties of the support are identified as crucial parameters for efficient NO x storage catalysts.

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Authors and Affiliations

  1. Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH-Zurich, Hönggerberg, HCI, 8093, Zurich, Switzerland

    M. Piacentini, M. Maciejewski & A. Baiker

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  1. M. Piacentini
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  2. M. Maciejewski
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  3. A. Baiker
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Correspondence to A. Baiker.

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Piacentini, M., Maciejewski, M. & Baiker, A. Role and distribution of different Ba-containing phases in supported Pt–Ba NSR catalysts. Top Catal 42, 55–59 (2007). https://doi.org/10.1007/s11244-007-0151-9

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