A gradient pore distribution alumina carrier and a preparation method thereof

By designing a core-shell structure for alumina supports with gradient pore distribution, the problems of high diffusion resistance and easy clogging in the hydrotreating of heavy and residual oils were solved, enabling effective diffusion and efficient treatment of macromolecules inside the catalyst.

CN117797792BActive Publication Date: 2026-02-17山西炬华新材料科技有限公司
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Patent Information

Application Number
CN202311751864.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-19
Publication Date
2026-02-17
Estimated Expiration
2043-12-19

AI Technical Summary

Technical Problem

Existing catalysts suffer from high internal diffusion resistance and easy clogging of catalyst surfaces in the hydrotreating of heavy and residual oils, making them unable to effectively process complex heavy oil molecules.

Method used

A gradient-pore alumina carrier is used, and through a core-shell structure design, the shell layer has pores of 0.5-1μm and the core layer has pores of 10-30nm. Elliptical lamellar pseudoboehmite is formed by two hydrothermal treatments, and the stacking forms large pores, which enhances the diffusion ability of macromolecules and the anti-clogging performance.

Benefits of technology

It achieves effective diffusion of macromolecules inside the catalyst, improves the apparent activity and anti-clogging ability of the catalyst, and is suitable for hydrotreating heavy residue oil with high impurity content.

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Abstract

The present application aims to provide a gradient pore distribution alumina carrier and a preparation method thereof, and belongs to the technical field of alumina material synthesis. After calcination of pseudo-boehmite, the present application immerses the pseudo-boehmite into an organic alkali solution twice for hydrothermal treatment. During the hydrothermal treatment, the alumina grains are rehydrated and secondarily grown to form elliptical flaky pseudo-boehmite with a morphology. The elliptical flaky particles are stacked to form a large number of macropore channels. During the shaping of the carrier, the content of the elliptical flaky pseudo-boehmite in the mixture is adjusted to prepare the alumina carrier with gradient distribution of the channels. The alumina carrier has a high content of macropores in the shell layer, and the channels are wide. The pore structure is beneficial to the diffusion of macromolecular reactants to the inside of the carrier, and at the same time, the surface of the carrier has a strong anti-clogging ability.
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