Effect of Phosphorus and Zinc on the Catalytic Performance of CoMo/Al<sub>2</sub>O<sub>3</sub> for Mild Hydrocracking of VGO

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  • VGOマイルドハイドロクラッキング反応におけるCoMo水素化脱硫触媒へ添加したリン，亜鉛の効果
  • Effect of Phosphorus and Zinc on the Catalytic Performance of CoMo/Al₂O₃ for Mild Hydrocracking of VGO

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<p>Conversion of heavy oil to more useful light oil is becoming increasingly important. Mild hydrocracking (MHC) in a hydrodesulfurization unit is a potential method. Although higher reaction temperature will accelerate the hydrocracking, coke deposition on catalyst would increase as a side reaction. Our previous study found that Zn + P doped NiMo/γ-Al2O3 catalyst could reduce the coke deposition and suppress catalyst deactivation. Therefore, we investigated Zn + P doped Co/Mo catalysts for MHC of VGO to suppress coke deposition. In addition, P, Zn and Zn + P doped γ-Al2O3 supports were prepared to evaluate the acidity and hydrogen activation ability on these surfaces. Deactivation of Zn + P doped catalyst was more suppressed than that of the P doped catalyst. Zn may decrease the number of Brønsted acid sites and improve hydrogen activation ability. The naphtha content in the product oil from Zn + P doped catalyst was less than that for P doped catalyst. Lower naphtha yield probably depended on the reduced number of Brønsted acid sites. Furthermore, the product oil from Zn + P doped catalyst had a lower aromatic content. Hydrogenation of the feedstock was promoted because Zn additive increased the activation of hydrogen. These characteristics all depended on the surface properties.</p>

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