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MnOx-CeO2 supported on Cu-SSZ-13: A novel SCR catalyst in a wide temperature range
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-24 , DOI: 10.1016/j.apcata.2017.08.024
Qingling Liu , Zhenchao Fu , Lei Ma , Hejingying Niu , Caixia Liu , Junhua Li , Ziyin Zhang

A novel Mn-Ce/Cu-SSZ-13 catalyst was synthesized for the selective catalytic reduction of NO with NH3 (NH3-SCR) over a wide temperature range. The NOx conversions of this catalyst were above 90% from 125 °C to 450 °C. The catalyst also possessed good H2O and SO2 resistances at 300 °C and possessed higher activities than Cu-SSZ-13 at 80 °C to175 °C and Mn-Ce at above 200 °C. TPD and in situ DRIFTS analyses showed that bridging nitrate groups on Cu-SSZ-13 could not participate in the SCR reaction. Moreover, NH3 was easily adsorbed to form NH4NO3, which encased the surface of the catalyst, thereby blocking the pores and deactivating the active sites. However, for Mn-Ce/Cu-SSZ-13, the bridging nitrates were adsorbed onto the surface and then converted to monodentate nitrates, which acted as the active species for the SCR reaction at low temperature. This phenomenon might be the primary reason for the enhanced SCR performance of Mn-Ce/Cu-SSZ-13 compared with Cu-SSZ-13 at low temperature.



中文翻译:

Cu-SSZ-13上负载的MnO x -CeO 2:宽温度范围内的新型SCR催化剂

合成了一种新型的Mn-Ce / Cu-SSZ-13催化剂,用于在较宽的温度范围内用NH 3(NH 3 -SCR)选择性催化还原NO 。从125℃至450℃,该催化剂的NO x转化率高于90%。该催化剂在300°C时还具有良好的H 2 O和SO 2耐受性,并在80°C至175°C时具有比Cu-SSZ-13和200°C以上的Mn-Ce更高的活性。TPD和原位DRIFTS分析表明,Cu-SSZ-13上的桥连硝酸根基团不能参与SCR反应。另外,NH 3容易被吸附而形成NH 4 NO 3。,它包裹了催化剂的表面,从而阻塞了孔并使活性位点失活。但是,对于Mn-Ce / Cu-SSZ-13,桥连的硝酸盐被吸附到表面,然后转化为单齿硝酸盐,这是低温下SCR反应的活性物质。这种现象可能是与低温下Mn-Ce / Cu-SSZ-13相比Cu-SSZ-13 SCR性能增强的主要原因。

更新日期:2017-08-24
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