Pt��ӷ�ʽ��Mn��߻��NSR��Ե�Ӱ��

ժҪ �ֱ��Ptֱ�ӽ��Mn₂O₃�ϡ�Pt/Al₂O₃��Mn₂O₃�ֲ��Լ��е��3�ֲ�ͬ�Ʊ��ϳɳ�Pt��Ϊ1%��Mn��߻��,��NO_x��Լ�NO_x��-��ԭѭ��ԡ��,��е��ϵ��Ʒ��NO_x��ߵ��Ч�ʡ��Mn₂O₃��Ʒ��Ƚ�,��е��ϵ��Ʒ��150 ��ʱ��NO_x��2��,�ߴ�368.1 μmol·g^-1,ͬʱNO_x��Ч�ʴ�0��ߵ�48.1%��ڻ�е��Ʒ��Pt�ܹ��ʹO₂�Ľ��,��NO_x��Ч��;��,��е��Ʒ��Pt��Mn��Эͬ��,�Ӷ��˴߻��NSR��ԡ�

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�ؼ���� Mn₂O₃�� Pt�� ﴢ�滹ԭ�� £� ��е��

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.

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

Received 2013-05-14;

Fund:

��Ȼ��ѧ�� (U1162103, U1232118);��Ȼ��ѧ��(11JCYBJC03700);��˲�֧�ּƻ�(NCET-10-0615);��ѧ��Ա��(2011-1568)��

Corresponding Authors: ��,�绰(022)27404701ת8510,E-mail:hui_xiantju@126.com�� Email: hui_xiantju@126.com

About author: ��¸�(1975-),��,��,��Ҫ��»��߻��о��

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��¸�, ��, ��, ��.Pt��ӷ�ʽ��Mn��߻��NSR��Ե�Ӱ��[J]. ��ѧ��ҵ�빤��, 2015,32(2): 13-17

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, 2015,32(2): 13-17

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