A kind of preparation method of amorphous silica-alumina spherical carrier

Abstract

The invention relates to a method for preparing a spherical amorphous silicon aluminum carrier. The method is characterized by comprising the following steps: firstly, preparing a filter cake containing an amorphous silicon aluminum composite oxide by using a neutralization method; secondly, adding a sodium alginate water solution to obtain an amorphous silicon aluminum composite oxide-sodium alginate suspension, dropwise adding the silicon aluminum composite oxide-sodium alginate suspension into a water solution containing divalent or trivalent metal ions with certain concentration, and gelling to form small amorphous silicon aluminum composite oxide-alginate composite balls; finally, washing, drying and roasting the small amorphous silicon aluminum composite oxide-alginate composite balls to obtain the spherical amorphous silicon aluminum carrier. According to the method, the spherical amorphous silicon aluminum carrier is prepared by directly molding the amorphous silicon aluminum composite oxide filter cake in a mild water phase, and only drying and roasting the filter cake once; the spherical amorphous silicon aluminum carrier is low in energy consumption, pollution-free and simple in preparation process, convenient to operate and easy to realize industrial production.

Description

Technical field: [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a method for preparing an amorphous silicon-aluminum spherical carrier. More specifically, the invention relates to a filter cake prepared by a neutralization method for amorphous silicon-aluminum composite oxide. Fully mixed with sodium alginate aqueous solution to obtain a suspension, further drop into the metal salt solution to form a gel, dry and roast to obtain an amorphous silica-alumina spherical carrier. Background technique: [0002] The progress of petrochemical catalyst technology often benefits from the improvement of the performance of catalytic materials, so the research on carrier preparation technology has been widely valued. With the development of the catalyst industry, the improvement of carrier performance plays an increasingly important role in the replacement of catalysts. The performance of the carrier is mainly determined by the chemical c...

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Problems solved by technology

Among them, the particle size of the product prepared by spray granulation is small; the roll forming is mainly used in the forming of hydraulic materials, and the raw material adaptability is poor; the particle size of the shaping granulation product is not uniform, the sphericity is poor, and the process is complicated, not suitable for continuous production, and the preparation process is dusty. Large, high loss of raw materials; although oil (ammonia) column molding can produce high-performance spherical carriers, the high cost of this process limits its application range

[0010] In the existing silicon-alumina spherical carrier preparation technology, there are disadvantages such as uneven distribution of silicon-alumina, two times of drying and roasting for the preparation of powder and carrier, difficulty in forming powder into balls, or high cost. It is urgent to develop a uniform distribution, Preparation technology of amorphous silicon-aluminum spherical carrier with large-scale adjustment of silicon-aluminum ratio, simple preparation process and low cost

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