Synergistic catalysis effect of Mn-promoted BaAl2O4 catalysts on catalytic performance for soot combustion

• Catalysts containing Mn exhibited high surface area and good redox property.
• The Mn addition promoted drastically the catalytic performance for soot combustion.
• An optimized catalyst must accommodate barium and manganese with proper balance.
• The enhanced catalytic activity related with synergistic effect between Mn and Ba.

ABSTRACTA series of Mn-promoted BaAl2O4 catalysts were developed for catalytic soot combustion. These catalysts were characterized using XRD, BET, H2-TPR, O2-TPD, and in-situ DRIFTS. The results showed that an optimized combustion catalyst should accommodate barium and manganese with proper balance to promote soot combustion. A synergistic mechanism was suggested to explain the synergistic effect of manganese and barium: NO was trapped mainly as nitrites by barium, while the generated nitrites further transformed to nitrates facilitated by manganese, which finally oxidized soot into CO2.

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