Role and distribution of different Ba-containing phases in supported Pt–Ba NSR catalysts |
| |
Authors: | Piacentini M Maciejewski M Baiker A |
| |
Affiliation: | 1.Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH-Zurich, H?nggerberg, HCI, 8093, Zurich, Switzerland ; |
| |
Abstract: | 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. |
| |
Keywords: | NO x storage-reduction catalysts Pt– Ba/ceria Pt– Ba/zirconia Pt– Ba/silica Pt– Ba/alumina NO x storage efficiency effect of Ba-loading stability of barium carbonates |
本文献已被 SpringerLink 等数据库收录! |
|