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Pt–Ba/MeO (where MeO = Al2O3, CeO2, SiO2 and ZrO2) NOx storage-reduction catalysts with Ba-loading varying from 0 wt.% to 28 wt.% were investigated concerning stability of Ba phases and NOx 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 NOx storage tests indicated that the BaCO3 phase decomposing between 400 °C and 800 °C (LT-BaCO3) is the most efficient Ba containing phase for NOx 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. NOx storage measurements confirmed a correlation between the concentration of LT-BaCO3 and NOx storage efficiency. Basicity and textural properties of the support are identified as crucial parameters for efficient NOx storage catalysts.

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