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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 02: 137 - 142

DOI: https://doi.org/10.6023/A1107121

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Effect of Redox Co-precipitation Methods on Structure and Catalytic Activity of Ru/CeO2 Catalysts for Ammonia Synthesis

  • LIN Jian-Xin ,
  • ZHANG Liu-Ming ,
  • NI Jun ,
  • WANG Rong ,
  • WEI Ke-Mei
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  • National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002

Received date: 2011-06-28

  Revised date: 2011-09-26

  Online published: 2012-02-25

Supported by

Project supported by Innovation Fund of China National Petroleum Corporation (No.2010D-5006-0502) and National Science and Technology Support Program of China (No.2007BAE08B02).

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Abstract

The Ru/CeO2 catalyst was prepared by redox co-precipitation methods, including normal precipitation, reverse precipitation and parallel flow precipitation. The obtained catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), CO chemisorption, and field-emission scanning electron microscopy (FE-SEM). The obvious difference of Ru dispersion and surface texture exist in the catalysts prepared by different methods. The activity test showed that the ammonia synthesis activity of the Ru/CeO2 catalyst prepared by reverse precipitation was 12.6% at 10 MPa, 10000 h-1, and 425 ℃, which was much higher than those obtained by other methods. Such a high catalytic attributes to three facts: the easier reduction, the much higher dispersion of Ru (45.6%) and bigger surface area (120 m2/g).

Key words： redox co-precipitation; ammonia synthesis; cerium dioxide; ruthenium

Cite this article

LIN Jian-Xin , ZHANG Liu-Ming , NI Jun , WANG Rong , WEI Ke-Mei . Effect of Redox Co-precipitation Methods on Structure and Catalytic Activity of Ru/CeO2 Catalysts for Ammonia Synthesis[J]. Acta Chimica Sinica, 2012 , 70(02) : 137 -142 . DOI: 10.6023/A1107121

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