关键词: 渣油加氢, 活性组分, 非均匀分布, 催化剂

Abstract: The effect of the pH value of impregnation solution, calcination temperature of support and adding competitive adsorbates on the distribution of active metals on Al2O3 support was investigated. Ni/Al2O3 and Mo/Al2O3 catalysts with various active metal distributions were prepared by adjusting the pH value of impregnation solution and selecting support calcined under suitable temperature. Furthermore, during preparation adding a competitive adsorbate, phosphoric acid, catalysts with single/dual active metals having yolk-like non-uniform distribution of active metals could be obtained. These samples of support and catalyst were characterized by BET, FT-IR and SEM-EDS. The catalytic performance of the prepared residue hydrodemetallization NiMo/Al2O3 catalyst was evaluated using a residue feedstock. Results showed that the prepared NiMo/Al2O3 catalyst with yolk-like non-uniform distribution of active metals exhibited better activity, improved distribution of metal deposits and enhanced metal tolerance capacity as compared with the conventional catalyst having uniform distribution of active metals.

Key words: residue hydrotreating, active metal, non-uniform distribution, catalyst