Method for preparing amorphous silicon alumnium using carbonization method

Abstract

This invention discloses a method to prepare amorphous silica-alumina, which comprises: forming gel by mix of sodium aluminate solution and silicon-containing compound and CO2, filtering, cleaning and drying. Wherein, the forming gel process uses pH-value swinging method, and during the process, it adds silicon-containing compound step by step. This method needs low cost, has no pollution; the product has well chemical properties, can be used as carrier component in catalytic cracking and hydrocracking or olefin oligopolymerization catalyst.

Description

technical field [0001] The invention relates to a method for preparing amorphous silicon-aluminum, in particular to a method for preparing amorphous silicon-aluminum by a carbon dioxide neutralization method (that is, a carbonization method). Background technique [0002] Amorphous silica-alumina has certain pore structure and specific surface area, so it can be used as catalyst carrier and adsorbent in oil refining and petrochemical industry. Amorphous silica-alumina as a catalyst carrier requires itself to have a large specific surface and pore volume to ensure the dispersion of catalyst active components, and as a carrier for cracking catalysts, amorphous silica-alumina must also have a certain cracking activity (i.e. acidic). [0003] The preparation of amorphous silica-alumina in the prior art is mostly limited by the preparation method. If it is required to have a large surface area and pore volume, it cannot introduce a sufficient amount of silica, and its acidity is...

AI Technical Summary

Problems solved by technology

The preparation method is to form a mixed solution of alkali metal aluminum salt and silicate at a pH value of about 12, and then react with aluminum sulfate to prepare a silicon-aluminum carrier. The specific surface of the product is 277m 2 / g, pore volume 0.31ml / g, containing SiO 2 35wt%, the disadvantage is that the pore volume and specific surface are low, as a carrier catalyst, silica-alumina cannot provide higher metal dispersion for active components

[0007] CN1210755A discloses a kind of amorphous silicon aluminum and its preparation method, its silicon oxide content is 10~50wt%, specific surface is 350~600m 2 / g, pore volume 0.8~1.5ml / g, infrared acidity 0.25~0.55mmol / g, its preparation process is NH 3 ·H 2 O and alumina first form alumina and then decompose silicate, which will produce ammonia and nitrogen-containing wastewater and pollute the environment