Effects of Chelating Agents as Additives on Preparation of Co-Mo Hydrodesulfurization Catalysts. The Effect of NTA(nitrilotriacetic acid) Addition on Hydrodesulfurization Activity and Surface Composition.

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  • SHIMIZU Takehiro
    Dept. of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University
  • KASAHARA Seiji
    Dept. of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University
  • KIYOHARA Tetsuya
    Dept. of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University
  • KAWAHARA Kan
    Dept. of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University
  • YAMADA Muneyoshi
    Dept. of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University

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Other Title
  • Ｃｏ‐Ｍｏ系脱硫触媒調製時におけるキレート剤の添加効果　脱硫活性と表面組成に対するＮＴＡ（ニトリロ三酢酸）の添加効果
  • The Effect of NTA (nitrilotriacetic acid) Addition on Hydrodesulfurization Activity and Surface Composition
  • 脱硫活性と表面組成に対するNTA (ニトリロ三酢酸) の添加効果

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Co-Mo/Al2O3 catalysts prepared by an impregnation method using NTA (nitrilotriacetic acid) as a chelating agent, were used to test the hydrodesulfurization (HDS) activity of benzothiophene and to observe the effect of XPS (X-ray photoelectron spectroscopy). The NTA-added catalysts showed ca. 20% higher HDS activity than that of conventional catalysts. The result of the activity test as a function of Co/Mo ratio suggested that the same highly active sites were formed when Co/Mo ratio (atom/atom) was less than ca. 0.3, and above 0.3 less active Co species was formed. It was also suggested that NTA contributed to the formation and to increasing the number of highly active sites. When the NTA-added catalysts were calcined before sulfidation, the increment of HDS activity was reduced by half. XPS measurements for catalyst precursors (before sulfidation) revealed that, when they were not calcined, the Co concentration at the surface of the catalysts prepared by the NTA method was higher than that of the conventionally prepared catalysts. Accordingly, it was suggested that NTA has a role of increasing Co surface density; thus, increasing the catalytic activity.

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