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无机材料学报

• 研究论文 • 上一篇    下一篇

LaSrCoO4催化材料的制备及性能的研究

杨小毛1,2; 罗来涛1; 钟华1   

  1. 1. 南昌大学应用化学研究所, 南昌 330047; 2. 江西财经大学材料研究所, 南昌 330013
  • 收稿日期:2004-02-13 修回日期:2004-05-10 出版日期:2005-03-20 网络出版日期:2005-03-20

Proparation of LaSrCoO4 Mixed Oxides and Their Catalytic Properties

YANG Xiao-Mao1,2; LUO Lai-Tao1; ZHONG Hua1   

  1. 1.Institute of Applied Chemistry; Nanchang University; Nanchang 330047; China;2. Institute of Materials; Jiangxi University of Finance & Economics; Nanchang 330013; China
  • Received:2004-02-13 Revised:2004-05-10 Published:2005-03-20 Online:2005-03-20

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摘要： 采用明胶法、聚乙二醇凝胶法和聚丙烯酰胺法制备了类钙钛矿LaSrCoO4复合氧化 物,考察了它们对CO和C3H8的氧化反应活性,研究了制备方法对催化材料结构和性能的影 响,并运用XRD、BET、TEM、TPR和TPD等方法对催化材料进行了表征.结果表明, 该类复合氧化物具有四方K2NiF4结构,制备方法对催化材料的结构和性能有较大影响,其中 以聚丙烯酰胺法最好.聚丙烯酰胺法所制LaSrCoO4的比表面较大,氧缺陷和易移动晶格氧较 多,催化活性较高.焙烧温度越低,比表面越大,氧缺陷及晶格氧越多,催化活性越高.

关键词: LaSrCoO4, 类钙钛矿, 制备方法, 氧化反应

Abstract: The perovskite-like LaSrCoO4 mixed oxides with K2NiF4 structure were prepared by the gelatin,
polyglycol gel and polyacrylamide gel methods and used successfully for CO and C3H8 oxidation. These samples were investigated by using the
XRD, TEM, BET, TPR and TPD methods. The effects of preparation methods on structure and performance of LaSrCoO4 were studied. The results indicate
that all La2-xSrxCoO4 have tetragonal K2NiF4 structure, their structure and catalytic activities change with the change of the
preparation methods. T* phase appears in LaSrCoO4 prepared by the polyacrylamide gel method, and the lower the calcination temperature is,
the more the T* phase appears. At the order of LaSrCoO4 prepared by gelatin method, polyglycol gel method and polyacrylamide gel method,
their BET surface areas, oxygen vacancies, mobile lattice oxygen and catalytic activities gradually increase, in addition, the lower calcination temperature is advantageous to these changes.

Key words: LaSrCoO4, perovskite-like, preparation method, oxidation

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