Effect of Pt Adding Method on the NSR Activity of the Mn-Based Oxide at Low Temperature

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Abstract The Mn-based catalysts were prepared by three different methods: Pt directly impregnating on Mn₂O₃, Pt/Al₂O₃ and Mn₂O₃ delamination and mechanical mixing. And the Pt content of the catalysts was 1% (mass fraction). The NO_x storage capacity and NO_x storage-reduction cycle activity indicated that the sample mixing by machine exhibited the biggest NO_x storage capacity and highest eliminated efficiency. Compared with the Mn₂O₃ sample, the NO_x storage capacity of the mechanical mixing sample increased more than twice and reached 368.1 mmol·g^-1 at 150 ��. Meanwhile, the NO_x eliminated efficiency increased from 0 to 48.1%. This was due to the Pt in the mechanical mixing sample could promote the oxygen dissociation and enhance NO_x storage efficiency. In addition, Pt had a significant synergistic effect on Mn in the mechanical mixing sample, then increasing the NSR activity of the catalyst.

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Keywords�� Mn₂O₃�� platinum�� NO_x storage and reduction�� low temperature�� mechanical mixing

Received 2013-05-14;

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Li Xingang, Ge Chaoyi, Guo Li, Xian Hui.Effect of Pt Adding Method on the NSR Activity of the Mn-Based Oxide at Low Temperature[J] Chemcial Industry and Engineering, 2015,V32(2): 13-17

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