Preparation method of zirconium-containing solid super acid

Abstract

The invention discloses a preparation method of a zirconium-containing solid super acid. According to the preparation method, template ion exchange is adopted so as to introduce a certain amount of zirconium element into unroasted pure silicon molecular sieve; Zr-MFI is obtained via filtering, washing, and roasting; a solution with a certain SO4<2-> concentration is used for dipping the obtained molecular sieve; and the solid super acid is obtained via filtering, drying, and roasting. Compared with molecular sieves of other skeleton types, the MFI-type skeleton structure obtained via preparation catalysis possesses neat pore passage structures and relatively thick pore walls, and excellent hydrothermal stability; pore passage regularity can be maintained for a long time under mechanical action of flow such as high temperature high pressure flow, collapse is not induced, stability is high, acid strength is high, the zirconium-containing solid super acid possesses both excellent performance of solid molecular sieves, acidity of super acid, and uniformly distributed acid sites, is a novel acid catalytic material with enormous potential; and application prospect in reactions such as alkylation, isomerization, esterification, acylation, polymerization, and oxidation is promising.

Description

technical field [0001] The invention relates to a method for preparing a solid superacid, in particular to a method for preparing a molecular sieve solid superacid through a template ion exchange method. Background technique [0002] Acid catalysts are widely used catalysts in the chemical industry. Traditional acid catalysts include liquid catalysts such as concentrated sulfuric acid and hydrofluoric acid. These catalysts have sufficient contact with materials and high catalytic efficiency. However, these two types of catalysts have problems of polluting the environment and corroding equipment, and are facing elimination. Compared with liquid acids, the density of strong acid centers in general solid acids is much smaller than that of liquid acids, and the intensity distribution of acid centers is not uniform, so it is difficult to meet the demand for acid strength in many reactions, thus restricting its industrial application. Therefore, the development of solid superacid...

AI Technical Summary

Problems solved by technology

[0007] Although halogen-containing solid superacids have high catalytic activity, there are problems such as easy detachment of active components, high temperature resistance, poor hydrothermal stability, and environmental pollution, which limit their application; SO 4 2- / MxOy type solid superacid has the advantages of simple preparation and high activity, but the existing problems are relatively small specific surface, irregular pore structure, poor catalytic selectivity, SO 4 2- Groups are easily lost in water or other solvents, the concentration of sulfuric acid used for impregnation is limited

At present, there is no synthesis of MFI framework type superacid catalyst by template ion exchange in the disclosed solid superacids.

Images