Microsphere aluminum oxide catalyst, and preparation method and application thereof

Abstract

The invention relates to a microsphere aluminum oxide catalyst, and a preparation method and an application thereof. Aiming at the defects of a conventional microsphere aluminum oxide manufacturing process, a neutral water slurry is obtained through physical particle refinement, and a high-solid-content water slurry preparation is realized, so the spray drying efficiency can be improved, and the microsphere aluminum oxide catalyst with wider granularity control space and more advantages is obtained. According to the invention, the high-solid-content aluminum oxide water-based water slurry is prepared; no auxiliary agent or additive is introduced; and the high-solid-content aluminum oxide water-based water slurry is subjected to spray drying to obtain aluminum oxide microspheres with an open structure and excellent wear resistance. During preparation of the water slurry, deionized water and aluminum oxide powder are uniformly mixed and further homogenized to obtain the high-solid-content water slurry with specific rheological properties. The aluminum oxide microspheres prepared by using the method provided by the invention have wide granularity control range; the high-solid-contentwater slurry preparation can be obtained without the need of introducing a strong acid or any acidic substance in the preparation process; and after the high-solid-content water slurry preparation issubjected to spray drying, the microsphere aluminum oxide catalyst with high sphericity degree and an open microsphere structure and facilitating diffusion of reactants and product molecules is obtained.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a microsphere alumina catalyst and its preparation method and application. Background technique [0002] Alumina is a functional material in the fields of catalysts, molecular sieve synthesis raw materials, adsorbents, coatings, surface coatings, metal surface polishers, high temperature resistant materials, high temperature ceramics, honeycomb carriers and abrasive tools. Often the use of alumina is limited by its impurity content. For the field of catalysts and adsorbents, low sodium is the goal, and the sodium content can be as low as 25-50ppm. The lower the sodium content, the higher the application value of functional materials. [0003] Ultra-high-purity alumina (UHPA) is generally prepared by hydrolysis of alcohol oxygen or metal aluminum hydrolysis. High-purity alumina (HPA) is usually prepared from aluminum hydroxide. [0004] As a superior and widely u...

AI Technical Summary

Problems solved by technology

The above process not only introduces strong acid substances to cause the problem of tail gas treatment after treatment, but also changes the characteristics of alumina raw materials due to the digestion of alumina surface substances by strong acids

Another defect of this process is that the viscosity of the water slurry is too high due to the generation of a large number of colloidal species, and it is difficult to obtain a high-solids water slurry, so that the efficiency of the spray drying process is low, and the performance of the obtained microsphere product is greatly restricted and restricted.

Images