催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (1): 62-66.

• 研究论文 • 上一篇    下一篇

纳米γ-Fe2O3载体的制备及Ru-K/Fe2O3催化剂的氨合成催化活性评价

倪军1,王榕1,郑瑛2,林建新1,魏可镁1   

  1. 1 福州大学化肥催化剂国家工程研究中心, 福建福州 350002; 2 福建师范大学化学与材料学院, 福建福州 350007
  • 收稿日期:2007-01-25 出版日期:2007-01-25 发布日期:2010-08-28

Preparation of γ-Fe2O3 Support and Evaluation of Catalytic Activty of Ru-K/Fe2O3 Catalyst for Ammonia Synthesis

NI Jun1, WANG Rong1, ZHENG Ying2, LIN Jianxin1, WEI Kemei1*   

  1. 1 National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, Fujian, China; 2 College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian, China
  • Received:2007-01-25 Online:2007-01-25 Published:2010-08-28

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摘要： 在室温条件下,通过溶胶-凝胶法制备了新的纳米氧化铁载体. X射线衍射、差热-热重分析、扫描电子显微镜和N2物理吸附等测试结果表明,制得的Fe2O3粉体具有典型的介孔结构,孔径范围18.8～25.0 nm, 晶相组分由原料配比和制备条件决定. 进一步通过浸渍法制备了高活性的Ru-K/Fe2O3氨合成催化剂. 在475 ℃, 10 MPa, 10000 h-1和V(H2)/V(N2)=3的条件下,考察了负载型Ru-K/Fe2O3催化剂的活性. 结果表明,载体中γ-Fe2O3的含量越高,其氨合成活性越好.

关键词: 溶胶-凝胶法, 介孔氧化铁, 载体, 钌, 钾, 氨合成

Abstract: A novel nanometer iron oxide support was successfully synthesized by the sol-gel method. The results of X-ray diffraction, differential thermal analysis, thermogravimetric analysis, scanning electron microscopy, and N2 physical adsorption show that the prepared Fe2O3 particles have a typical mesoporous structure with pore diameters of 18~8[KG-45x]-[KG-20x]25~0 nm. The effect of the crystal phase composition of Fe2O3 on catalytic activity of the Ru-K/γ-Fe2O3 catalyst was further investigated under the conditions of 475 ℃, 10 MPa, 10?000 h-1, and V(H2)/V(N2)=3. The higher the content of γ-Fe2O3 in the support, the better the catalytic activity of the catalyst.

Key words: sol-gel method, mesoporous iron oxide, support, ruthenium, potassium, ammonia synthesis