改性γ-Al2O3载体上钴和钼的分散状态

摘要/Abstract

摘要： 利用XRD、BET磁性分析等手段研究了在磷或钾改性的γ-Al₂O₃上钴和钼的存在形态,在Co-Mo/γ-Al₂O₃负载型催化剂中,载体γ-Al₂O₃的改性处理对钴和钼的分散程度有显着影响。用磷酸处理γ-Al₂O₃载体时,由于载体的表面形成了类似AlPO4式的结构,从而抑制了Mo-O-Al的生成,使钼以MoO₃的形式存在。而在此载体上,弱碱性的钴则与磷酸在γ-Al₂O₃表面形成了类似磷酸钴式的结构,达到了较均匀的分散。用碳酸钾处理γ-Al₂O₃载体时,载体表面的强碱性抑制了钴的分散,使之形成了较大的Co₃O₄晶粒。相反,钼的分散度得到了提高

关键词: γ－Al₂O₃, 钴钼催化剂, 分散度

Abstract: The dispersion of Co and Mo on phosphorus and potassium modified γ-Al₂O₃ was investigated by X-ray diffraction, BETsurface areas and magnetic susceptibility analysis. It was found that molybdenum can no longer reach a single layered dispersion as it does on γ-Al₂O₃ support, but forms large crystallite of MoO₃ on the H₃PO₄ treated γ-Al₂O₃ support. While, cobalt oxide is highly dispersed with the help of phosphorus treatment. The resulting surface cobalt compound was recognized as staying in the tetrahedral coordination state. A-AlPO₄ like surface compound on the phosphorus modified γ-Al₂O₃ was supposed and the influence of phosphorus on the dispersion of Co and Mo was explained accordingly. Effects of potassium on the dispersion of Co and Mo were also reported and discussed here in.

Key words: γ-Al₂O₃, Co-Mo based catalyst, dispersion

康慧敏, 王大祥, 张鎏. 改性γ-Al₂O₃载体上钴和钼的分散状态[J]. 应用化学, 1997, 0(1): 37-40.

Kang Huimin, Wang Daxiang, Zhang Liu. Dispersion of Cobalt and Molybdenum on Phosphorus or Potassium Modified γ-Al₂O₃ Support[J]. Chinese Journal of Applied Chemistry, 1997, 0(1): 37-40.

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改性γ-Al₂O₃载体上钴和钼的分散状态

Dispersion of Cobalt and Molybdenum on Phosphorus or Potassium Modified γ-Al₂O₃ Support

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