Preparation method of macroporous aluminum oxide with diplopore distribution

Abstract

A preparation method of a large-pore aluminum oxide with double-pore spread structure. First, aluminum oxide, a poreforming agent and solid silica are mixed, and receive ball-milling treatment in a ball milling machine; the mixture after treatment is kneaded into a plastic body by aqueous solution with cationic surfactant, extrusion aid, peptizator, etc. dissolved in, and put into the water vapor atmosphere to be treated; and the prepared mould is dried and baked, to obtain the final aluminum oxide carrier. The poreforming agent is one or the mixture of carbon black, cellulose and starch, and the loading is 3.0 to 15w percent of the weight of the aluminum oxide; the solid silica is silica aerogel, and the loading is 1.0 to 10w percent of the weight of the aluminum oxide; in the ball milling machine, the ball-material ratio is 15:1 to 10:1, and the ball milling time is 0.5 to 3.0h; the treatment temperature of the water vapor is 120 DEG C to 180 DEG C, and the treatment time is 0.5 to 6.0h. The aluminum oxide prepared by the invention has double-peak channel structure and high strength, and is applicable in fields of petrochemical, petroleum processing, environmental protection, etc.

Description

technical field [0001] The invention belongs to the technical field of inorganic porous materials, and in particular relates to a preparation method of macroporous alumina with double-pore distribution. Background technique [0002] Alumina is a very promising material. Based on its thermal, chemical and mechanical stability, oxidation resistance and low price, it is widely used as a catalytic material, such as acid catalyst, catalyst carrier, etc., as well as for adsorption and separation. and other fields. Alumina in practical application cannot be a powder material, and requires particles with a certain size (millimeter or submicron). The mesopores and macropores in these particles are conducive to the diffusion of reactants and products, and the carrier of multi-layered pores Materials will have higher efficiencies. In the field of catalyst application, the pore size and distribution of the alumina support have an important influence on the diffusion properties of the ...

AI Technical Summary

Problems solved by technology

[0006] The invention discloses a method for preparing macroporous alumina with double-pore distribution, the purpose of which is to overcome the low macroporous ratio existing in the above alumina carrier preparation method, which is difficult to meet the process of macromolecules participating; the crushing strength is low, The pulverization of the carrier affects the performance of the catalyst and the efficiency of the reactor; as well as the defects of dispersed pore distribution and low mechanical strength of the prepared carrier