σ-AgFeO2晶相对银铁复合氧化催化剂表面氧性能的影响
THE EFFECT OF σ-AgFeO2 PHASES TO SURFACE OXYGEN PROPERTY OF Ag-Fe MIXED OXIDE CATALYSTS
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摘要: 采用共沉淀法制备了一系列不同摩尔比的银铁复合氧化物催化剂.采用XRD,TPD-MS,TPR等技术以及CO氧化反应考察了银铁复合氧化物催化剂的结构和表面氧性质.研究结果表明,催化剂上生成的σ-AgFeO2晶相结构对催化剂的表面氧性能及CO氧化反应贡献较大,同时发现,Ag/Fe(1:1)催化剂的还原能力、氧脱附能力明显优于其他比例的催化剂,并与CO氧化活性相对应.Abstract: In this paper, different ratio of Ag/Fe mixed oxide catalysts have been prepared by coprecipi-tation method. The structure and surface oxygen property of different Ag/Fe ratio catalysts were investigated by XRD, TPD-MS and TPR technology. The result indicated that the σ-AgFeO2 phases are the main attribution to the surface oxygen property and COoxidation activity of catalysts. Meanwhile, the Ag/Fe (1:1) catalyst exhibited the highest reducibility and CO oxidation activity among the other ratio of catalysts which resulted with the crystal of the σ-AgFeO2 in catalysts.
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Key words:
- crystal phase /
- Ag-Fe catalyst /
- surface oxygen property /
- oxide activity
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