Get access

Rare-Earth-Doped Pt/Ba/Ce0.6Zr0.4O2-Al2O3 for NOx Storage and Reduction: The Effect of Rare-Earth Doping on Efficiency and Stability

Authors

  • Dr. Xiuyun Wang,

    1. State Key Laboratory of Structural Chemistry, Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China), Fax: (+86) 591-83714946
    2. Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China)
    Search for more papers by this author
  • Dr. Zhilin Chen,

    1. State Key Laboratory of Structural Chemistry, Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China), Fax: (+86) 591-83714946
    2. Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China)
    Search for more papers by this author
  • Yuling Wang,

    1. State Key Laboratory of Structural Chemistry, Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China), Fax: (+86) 591-83714946
    Search for more papers by this author
  • Prof. Ruihu Wang

    Corresponding author
    1. State Key Laboratory of Structural Chemistry, Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China), Fax: (+86) 591-83714946
    2. Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China)
    • State Key Laboratory of Structural Chemistry, Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian, 350002 (P.R. China), Fax: (+86) 591-83714946

    Search for more papers by this author

Abstract

Rare-earth-doped Pt/Ba/RO-CZA (RO=La2O3, Nd2O3 and Y2O3; CZA=Ce0.6Zr0.4O2-Al2O3) were synthesized and characterized by XRD, N2 physisorption, Raman spectroscopy, H2 temperature-programmed reduction, extended X-ray absorption fine structure analysis, scanning transmission electron microscopy, and X-ray photoelectron spectroscopy. The effect of the addition of rare earths on Pt/Ba/RO-CZA was explored, and the relationship between their structures and properties was disclosed. In comparison with Pt/Ba/CZA, La and Nd addition, especially La addition, resulted in an apparent increment of oxygen vacancies and the improvement of the reductive capacity of Ce4+, which are favorable for NOx reduction. However, the presence of Y induced a negative effect on NOx storage and reduction (NSR). The NSR performances of Pt/Ba/RO-CZA were initially evaluated by using NO-to-NO2 conversion, NOx storage capacity, and NOx conversion. The NOx conversion in Pt/Ba/La-CZA and Pt/Ba/Nd-CZA at 350 °C is up to 98 and 94 %, respectively. Interestingly, the addition of rare earths contributes to the enhancement of the thermal stability, a slight decrement of NOx conversion was observed after Pt/Ba/RO-CZA were maintained at 350 °C for 100 h, whereas an obvious loss of catalytic activity was found in Pt/Ba/CZA under the same conditions. TEM analysis showed that the presence of La inhibits the agglomeration of Pt and the sintering of particles.

Get access to the full text of this article

Ancillary