High-silicon amorphous silica aluminum and preparation method thereof

Abstract

The invention discloses high-silicon amorphous silica alumina and a preparation method thereof. The amorphous silica alumina product has the properties of a specific surface area of 400 to 650m / g, a pore volume of 1.0 to 2.0cm / g, a silicon oxide content of 20 to 80wt percent, a infrared acid content of 0.3 to 0.8 mmol / g and evenly distributed acidic centers. Moreover, the amorphous silica alumina is prepared by a method comprising first coprecipitation of silicon oxide and alumina and then modification of organic silicon. Compared with the prior art, the amorphous silica alumina has larger pore volume and specific surface area, evenly distributed acidic centers and excellent service performance; moreover, the preparation method is simple, free from special environmental protection problem and low in production cost.

Description

technical field [0001] The invention relates to an acidic amorphous silicon-alumina with high silicon, large pore volume and large specific surface area and a preparation method thereof. technical background [0002] In the field of catalysis, how to prepare high-efficiency catalysts with high activity, excellent selectivity and long life has always been a subject of concern and attention. For supported catalysts with amorphous silica-alumina as the carrier, amorphous silica-alumina not only bears the task of supporting other active components, but also has a certain acid cracking function and plays the role of solid acid catalysis. The use of amorphous silica-alumina carrier with high specific surface area can prepare a supported catalyst with high dispersion of active components, which is conducive to improving the reaction performance of the catalyst; the catalyst containing amorphous silica-alumina has a larger pore volume, which will improve Its anti-coking or anti-cok...

AI Technical Summary

Problems solved by technology

Although it has a certain cracking activity, when it carries a relatively high amount of metal components, the pore structure of the prepared catalyst cannot meet the requirements of actual use.

CN03133986.7 and CN200410050785.X have introduced two kinds of preparation methods that adopt carbonization method to form colloid to prepare amorphous silicon aluminum, but the use of carbonization method is limited by factors such as equipment, raw materials and the adjustable range of pH of colloidal formation, can not be very good To meet the requirements of improving the performance of amorphous silicon aluminum and industrial promotion

[0006] Through the analysis of the above patents, it is not conducive to the uniform distribution of silicon and aluminum of amorphous silicon and aluminum by using non-silicon and aluminum simultaneous precipitation methods such as silicon first and then aluminum or first aluminum and then silicon. The amorphous silicon-alumina prepared by this method cannot obtain a large enough surface area and pore volume, and the use performance is poor.