84results about How to "Slow down inactivation" patented technology

The invention relates to a graded composition of heavy oil hydrogenation catalysts. 5 to 55 percent of hydrodemetallization catalyst, 5 to 55 percent of hydrodesulfurization catalyst and 5 to 55 percent of hydrodenitrogenation catalyst are filled into a reactor from the top to the bottom respectively; along the flow direction, the activity of the catalysts is gradually increased, the aperture is gradually reduced, the granularity is gradually reduced and the porosity is gradually reduced; the active metal ingredients and the acid aid concentrations of the demetallization catalyst and the desulfurization catalyst are in non-uniform distribution, the active metal ingredient and the acid aid concentration of the demetallization catalyst are in gradient reduction, and the active metal ingredient and the acid aid concentration of the denitrogenation catalyst are in gradient increment; the active metal ingredient and the acid aid concentration of the desulfurization catalyst are in uniform distribution; the demetallization catalyst, the desulfurization catalyst and the denitrogenation catalyst consist of one or more catalysts respectively; and the demetallization, carbon residue removal, desulfurization and denitrogenation activities and stability of the catalyst graded composition system are high, and the service life is long.