Silica sol, silica-alumina sol, preparation method and application, catalytic cracking catalyst and preparation method

Abstract

The invention relates to the field of silica-alumina sol used in catalytic cracking catalysts, and discloses a silica sol, a silica-alumina sol, preparation methods and application of the silica sol and the silica-alumina sol, a catalytic cracking catalyst and a preparation method of the catalyst. The SiO2 content of the silica sol is in a range of 25-40% by weight; the Na2O content of the silica sol is less than 0.15% by weight; the pH value of the silica sol is in a range of 2-10, the density of the silica sol is in a range of 1.1 g / cm<3>-1.3 g / cm<3>; and the viscosity of the silica sol is 200 mPa*s or more. The invention further provides the silica-alumina sol which contains an alumina sol having the advantages of fewer free chloride ions, optimized structure, large viscosity, low corrosion rate, high pH value and the like. The silica-alumina sol can strengthen particle structure of an adhesive and increase adhesive property of the adhesive; and the silica-alumina sol also can reduce blocking of active-component molecular sieve structures in the catalyst by the adhesive, reduce the influence degree of the adhesive to catalyst activity, can reduce the usage amount of molecular sieves in the catalyst and decrease the cost of the catalyst.

Description

technical field [0001] The present invention relates to the field of silica-alumina sol for catalytic cracking catalysts, in particular to a silica-alumina sol, a silica-alumina sol composed of the silica sol and a preparation method, and the application of the silica-alumina sol in the preparation of catalytic cracking catalysts, and a Catalytic cracking catalyst and its preparation method. Background technique [0002] Fluid catalytic cracking technology is the most important means of secondary processing of crude oil. With the deepening of the heavy and inferior quality of FCC feed, the content of active component molecular sieve in the catalyst has increased from 15-20% in the early stage to the present 35% or even 40% of the above. With the increase of molecular sieve content, the wear index and sphericity of the catalyst have become a very important issue in the catalyst preparation process. The catalyst must meet a certain strength requirement and at the same time, ...

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Problems solved by technology

The purpose of spray drying is to evaporate excess water in the slurry at a certain temperature. When the solid content is low, more water needs to be evaporated, and the residence time of the material in the drying tower is the same, so more evaporation heat or high drying temperature is required. Moisture escapes rapidly from the inner surface of the particles at high temperature, forming hollow spheres or microspheres with apple stalks. On the one hand, the strength of the catalyst will deteriorate, and on the other hand, it will be easily broken when fluidized in the FCC reaction-regeneration system (reverse regeneration system).

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