Effect of Mg, Ca and Ba on the Pt-catalyst for NOx storage reduction

作者：Basile F; Fomasari G; Grimandi A; Livi M; Vaccari A^*

来源：Applied Catalysis B: Environmental , 2006, 69(1-2): 58-64.

DOI：10.1016/j.apcatb.2006.05.017

• NOx storage reduction
• NSR
• Ba
• Ca
• Mg
• Pt
• gamma Al2O3
• SO2 poisoning

A set of catalysts was prepared to improve the activity of the Ba-Pt/gamma Al2O3 catalyst in the NOx storage reduction (NSR), by replacing Ba with Mg or Ca, but maintaining constant the moles of alkaline-earth element in order to keep the number of storage sites constant. The catalysts were prepared by impregnating first 1.0 wt.% Pt and then the alkaline-earth cations (Ca, Mg and/or Ba) on a commercial gamma Al2O3 (Sasol, D). Tests were carried out in a wide temperature range (100-500 degrees C), thus evidencing the specific role of each different alkaline-earth element. Both the activity and the resistance to SO2 poisoning in the catalysts were different and the alkaline-earth cation with lower electronegativity registered the strongest deactivation. A new catalyst with high activity and resistance to deactivation by SO2 was obtained by co-impregnating Ba and Mg on gamma Al2O3 (1.5Mg8.5Ba-1Pt/gamma Al2O3).

• 出版日期2006-12-1