Phosphorus-and potassium-containing aluminum oxide carrier and preparation method thereof

Abstract

The invention discloses a phosphorus- and potassium-containing aluminum oxide carrier and a preparation method thereof. The aluminum oxide carrier is prepared by molding an aluminum oxide carrier by using aluminum hydroxide gel, which is prepared by a molten-salt super-solubility micelle method, as a raw material at first and then loading potassium and phosphorus on the aluminum dioxide carrier in a spraying and soaking mode. In a process of preparing the carrier, the aluminum hydroxide gel has a surfactant and hydrocarbon components, so that after the aluminum hydroxide gel is molded and roasted, aluminum oxide nanoparticles formed by dewatering the polymerized aluminum oxide still have a rod-like basic structure; the aluminum oxide nanoparticles are stacked into a framework structure in a disordered way, so that the carrier has a large pore volume, a large aperture, a high porosity, a large outer surface orifice and high duct penetrability; and after the surface acidity of the carrier is reduced by the potassium and the phosphorus, the surface activity of a catalyst is reduced, so that asphaltene micelles tend to disperse into the inner part of the carrier to undergo a reaction. Thus, a hydrocracking reaction is restrained, the generation of carbon deposit is prevented, a residual hydrodemetalization reaction is carried out smoothly, and the capability of dissolving metals is improved.

Description

Technical field [0001] The invention relates to an alumina carrier containing phosphorus and potassium and a preparation method thereof, in particular to an alumina carrier used for a residue demetalization catalyst and a preparation method thereof. Background technique [0002] At present, hydroprocessing is still the most important means of producing high-quality and environmentally friendly petroleum products. The core of the hydroprocessing technology is the catalyst, and the performance of the carrier is the key to preparing a hydroprocessing catalyst with excellent properties. For the heavy components of petroleum (such as VGO, especially residual oil), the pore size and pore volume of the carrier will directly affect the activity of the catalyst. [0003] So far, the catalyst carrier used in the residue fixed bed is still the classic alumina carrier. High-temperature roasting method, pH swing method and water vapor treatment can all obtain macroporous alumina suitable for ...

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Problems solved by technology

[0008] CN1123309A discloses a preparation method of a residual oil demetallization catalyst. The selected alumina carrier has a pore volume of 0.45-0.8ml / g, and the edge of the catalyst is passivated by potassium, but this catalyst does not have fully utilized pore channels

[0009] CN1123196A discloses a preparation method of residual oil demetallization catalyst, which uses potassium dihydrogen phosphate to prevent potassium loss, but this invention also has the disadvantage of too small pores

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