A method for preparing a silica-alumina gel

By forming a clear and transparent silica-alumina precursor solution under strong acid conditions and rapidly neutralizing it with ammonia water to form a gel, the problems of uniformity and performance fluctuation of silica-alumina gel were solved, achieving high-value utilization and performance improvement.

CN122403467APending Publication Date: 2026-07-17HENAN FLUORINE BASED NEW MATERIAL TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN FLUORINE BASED NEW MATERIAL TECH CO LTD
Filing Date
2026-06-08
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies for silica-alumina gels suffer from the following problems: sodium ion residues are difficult to remove, they easily form physically mixed phases, and the pore structure is difficult to control. Furthermore, the conventional reaction of fluorosilicic acid and aluminum hydroxide easily hydrolyzes out silica precipitate under acidic conditions, leading to heterogeneity of gel structure and performance fluctuations.

Method used

Under strong acid conditions, aluminum and silicon waste acid are used to form a clear and transparent precursor liquid. Through rapid ammonia water neutralization and simultaneous gelation, molecular-level uniform mixing of silicon and aluminum components is achieved. Fluorosilicic acid is used as the silicon source to achieve high-value utilization.

Benefits of technology

The homogeneity and stability of silica-alumina gel were achieved, the specific surface area and catalytic and adsorption performance were improved, and the problems of impurity residue and structural inhomogeneity in traditional methods were solved, realizing the high-value utilization of industrial by-product fluorosilicic acid.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122403467A_ABST
    Figure CN122403467A_ABST
Patent Text Reader

Abstract

The present application belongs to the technical field of inorganic porous gel materials, and particularly relates to a preparation method of a silicon-aluminum gel. Fluosilicic acid and an aluminum salt are used as raw materials to prepare a clear and uniform silicon-aluminum precursor solution under strong acid conditions, and then the solution is neutralized by ammonia water to form a gel to prepare an amorphous silicon-aluminum gel. The method realizes the molecular-level uniform mixing of silicon-aluminum components by forming a clear and transparent precursor solution from the aluminum source and the waste acid of the silicon source under strong acid conditions, thereby ensuring the uniformity of the product. In addition, the present application uses fluosilicic acid as the silicon source, thereby realizing the high-value utilization of the industrial by-product fluosilicic acid.
Need to check novelty before this filing date? Find Prior Art