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| Effect of Mn Loading on Nox Storage Performance of NSR Catalysts |
| DOI：10.13949/j.cnki.nrjgc.2018.06.006 |
| Key Words:sol-gel method impregnation method Mn loading Nox storage |
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| Abstract:With the aim of researching the effect of Mn loading on NOx storage performance of NSR catalysts, a series of Pt/15Ba/15Ce/xMn/γ-Al2O3 composite NSR catalysts with different Mn loadings were prepared by sol-gel method combined with impregnation method. The physicochemical properties of the catalysts were characterized by X-ray diffraction(XRD), specific surface area analyzer(BET) and scanning electron microscope(SEM), and the NOx complete storage performance of the catalysts was tested by a simulated gas test platform. Results show that the overall crystallization of NSR catalysts with different Mn loadings is in good conditions, in which Mn element coexists in the form of Mn2O3 and Mn2O2. The adding of Mn element maximizes the specific surface area of Pt/15Ba/15Ce/8Mn/γ-Al2O3 . The γ-Al2O3 mainly exists in the form of polygonal and long rods, and the active components are dispersed relatively uniformly. The Pt/15Ba/15Ce/8Mn/γ-Al2O3 has the strongest NOx storage capacity, its NOx storage efficiency can be as high as 89.47%, and the NOx storage capacity reaches 689.43 μmol/gcat. As observed, the storage capacities of catalysts, arranged in descending order are 8Mn, 10Mn, 6Mn, 4Mn, 2Mn and 0Mn. Especially in an atmosphere of 10% O2, the 1% Pt/15Ba/15Ce/8Mn/γ-Al2O3 catalyst has the strongest storage capacity. |
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