Preparation method of high-silicon macroporous amorphous silicon aluminum dry glue by using carbonation method

Abstract

The invention relates to a preparation method of high-silicon macroporous amorphous silicon aluminum dry glue by using a carbonation method. The preparation method comprises steps of: (1) separately preparing a sodium aluminate solution and a silicon-containing compound material; (2) adding the sodium aluminate solution into a sealed pressure reactor, feeding carbon dioxide under stirring, with the pressure being raised to 0.2-2.0 MPa, the reaction temperature being controlled to be 10-35 DEG C and the reaction pressure during a reaction process being maintained; (3) adding a measured solution of the silicon-containing compound in to the reactor, feeding the carbon dioxide under stirring, with the reaction pressure being controlled at 0.2-2.0 MPa, the reaction temperature being controlled at 10-35 DEG C and the reaction pressure being maintained during the reaction process; and (4) ageing after the neutralization reaction is finished, filtering, washing and drying to obtain an amorphous silicon aluminum dry glue product. Compared with the prior art, the preparation method increases the utilization rate of the carbon dioxide, improves the environment of the neutralization reaction, and facilitates quality improvement of the amorphous silicon aluminum dry glue product.

Description

technical field [0001] The invention relates to a method for preparing amorphous silicon-alumina, in particular to a method for preparing macroporous amorphous silicon-alumina dry glue by carbon dioxide neutralization method (that is, carbonization method). Background technique [0002] Amorphous silica-alumina, as the active component of solid acid catalyst or supported catalyst carrier, has good hydrocarbon cracking activity and good pore structure characteristics, and plays a very important role in improving the selectivity of medium oil and alleviating the accumulation of fused ring aromatics . Amorphous silica-alumina has certain pore volume and specific surface area, so it can be used as catalyst carrier or 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, am...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problems of low utilization rate of carbon dioxide in the above-mentioned conventional carbonization method and the insufficient adjustment ability of the pH value of the neutralization reaction. The reaction system is placed in a closed reactor to greatly improve the solubility of carbon dioxide in water. When the pressure reaches 1.0MPa, the solubility of carbon dioxide will be more than 10 times higher than that under normal pressure