Method for preparing hydro-demetalization catalyst for heavy oil

Abstract

The invention discloses a method for preparing a hydro-demetalization catalyst for heavy oil. The method comprises the following steps of: firstly, preparing an alumina carrier, then, loading active metal components by using an immersion method, and obtaining the final hydro-demetalization catalyst after drying and roasting, wherein the process for preparing the alumina carrier comprises the following steps of: (1) evenly mixing pseudoboehmite dry colloidal powder with an extrusion aid, and then, adding an aqueous solution in which a physical pore-expanding agent and a chemical pore-expandingagent are dissolved, wherein the physical pore-expanding agent is a carbohydrate, and the chemical pore-expanding agent is phosphoric acid, phosphate or borate; (2) evenly mixing the materials prepared in the step (1), and then, forming; and (3) drying and roasting the materials prepared in the step (2) so as to prepare the alumina carrier. The hydro-demetalization catalyst for the heavy oil, prepared by the method disclosed by the invention, has the advantages of larger pore volume, larger pore diameter, concentrated pore distribution, good mechanical strength, and higher activity and higheractivity stability in the process of the hydro-demetalization for the heavy oil.

Description

technical field [0001] The invention relates to a preparation method of a heavy oil hydrogenation demetallization catalyst. Background technique [0002] With the continuous reduction of oil resources and the increasing trend of heavy and inferior crude oil, heavy oil deep processing technology has been highly valued by refiners at home and abroad. Hydrodemetallization catalysts used for heavy oil, especially vacuum residue with high metal content, are prone to rapid decline and deactivation of catalyst activity due to the deposition of metal impurities such as nickel and vanadium. Catalysts with larger pore volume and larger pore diameter have strong metal and carbon capacity, which can slow down the deactivation of the catalyst and prolong the operation period of the catalyst. The pore structure of the catalyst is determined by the carrier that constitutes the catalyst. Therefore, the preparation of a carrier with a larger pore volume and larger pore diameter is an import...

AI Technical Summary

Problems solved by technology

Due to the large and non-concentrated particles of the physical pore-enlarging agent carbon black powder used in the carrier preparation process, the pore distribution of the carrier is dispersed and not concentrated, and the mechanical strength is poor.

As a result, the pore size distribution of the catalyst is dispersed and not concentrated, which reduces the activity and stability of the catalyst.

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