Nano aluminium trichloride solid-supported catalyst and preparation method thereof

Abstract

The invention relates to a method for preparing aluminium trichloride solid-supported nano silicon dioxide solid acid catalyst, comprising the steps: nano silicon dioxide is firstly activated at certain temperature, and then a certain quantity of aluminium trichloride stream is introduced into a reactor filled with the silicon dioxide; the aluminium trichloride is caused to react with hydroxide radical on the surface of the silicon dioxide at the set temperature, so that nano aluminium trichloride solid-supported catalyst having high specific surface area and surface acidity can be prepared. The range of the granularity of the catalyst is within 5-400nm. The method is characterized in that the nano silicon dioxide with low price is taken as a carrier, so as to avoid the inherent strong corrosivity and toxicity of the aluminium trichloride; the catalyst is easily separated from the products, so that the problems of environmental pollution caused by sewage produced in the post treatment of the traditional technique using aluminium trichloride catalyst and corrosion for equipment caused by the aluminium trichloride in the reaction process, and the defect that the granular solid-supported aluminium trichloride catalyst is easy to pulverize. The obtained catalyst can part replace the original used aluminium trichloride catalyst.

Description

technical field [0001] The invention relates to a method for preparing a nanometer solid-supported catalyst, in particular, a method for preparing a nanometer solid acid catalyst by immobilizing aluminum trichloride on the surface of nanometer silicon dioxide through a vapor phase deposition method. Background technique [0002] In petrochemical and other fields, aluminum trichloride is one of the widely used catalysts. Its main catalytic properties include alkane isomerization, alkylation, olefin polymerization and acylation. In the process of using aluminum trichloride as a catalyst, its application is more and more restricted due to its strong corrosion and toxicity, difficulty in separating the same product, and the generation of a large amount of sewage that pollutes the environment. By immobilizing aluminum trichloride on carriers with abundant pores and surface hydroxyl groups such as alumina, silica, and molecular sieves, the above-mentioned shortcomings are overcome...

AI Technical Summary

Problems solved by technology

In the process of using aluminum trichloride as a catalyst, its application is increasingly restricted due to its strong corrosiveness and toxicity, difficulty in separating the same products, and the generation of a large amount of sewage that pollutes the environment.