应用化学 ›› 1992, Vol. 0 ›› Issue (4): 107-110.

• 研究简报 • 上一篇    下一篇

La-Cu-Fe-O/γY-Al2O3催化剂的抗烧结研究

张学文, 俞寿明, 檀健, 林培琰   

  1. 中国科学技术大学近代化学系结构分析开放实验室, 合肥 230026
  • 收稿日期:1991-08-06 修回日期:1992-03-02 出版日期:1992-08-10 发布日期:1992-08-10
  • 基金资助:
    国家自然科学基金

SINTERING RESISTENT OF MULTIOXIDE CATALYST La-Cu-Fe-O/γ-Al2O3

Zhang Xuewen, Yu Shouming, Tan Jian, Lin Peiyan   

  1. Department of Modern Chemistry and Structure Research Laboratory, University of Science and Technology of China, Hefei 230026
  • Received:1991-08-06 Revised:1992-03-02 Published:1992-08-10 Online:1992-08-10

摘要: Cu-Fe-O/γ-Al2O3催化剂对CO、HC完全氧化和NOx还原均有较高活性。为了在温度高达~1000℃仍保持良好的活性,研究该类催化剂的高温热稳定性是个重要课题。通常在高温下,催化剂的物理和化学状态均会发生变化。有两个模型用来解释负载金属催化剂的烧结过程。一是Ruckenstein等提出的晶粒迁移机理[1]。另一个为Flynn等提出的原子或分子迁移机理[2]

关键词: 氧化铝, 氧化镧, 氧化铁, 氧化铜, 烧结, 相变

Abstract: The effects of thermal treatment on Cu-O/Al2O3, Fe-O/Al2O3, Cu-Fe-O/Al2O3 and La-Cu-Fe-O/Al2O3 at 750~1050℃ are studied. The changes in BET surface, average particle size in relation to the interaction between Al2O3 and active components are elucidated. It is found that both phase transition of γ-Al2O3 to α-Al2O3 and sintering of active components cccurred on two samples containing ferric oxides at 850℃. Such a phase transition occurred only until 950℃ for Cu-O/Al2O3. The effects on the reduction of phase transition temperature of γ-Al2O3 follow Cu-Fe>Fe>Cu. La2O3 raises phase transition temperature of γ-Al2O3 to α-Al2O3 and resistence sintering of active components. As detected by XRD the thermal stable LaAlO3 is formed at 850℃. LaAlO3 may highly disperse into the active components retarding migration and agglomeration of active components at high temperature.

Key words: aluminium oxide, lanthanum oxide, iron oxide, copper oxide, sintering phase transition