Process for synthesizing heteroatom substituted AEL cage construction aluminophosphates molecular sieve

Abstract

The invention relates to a synthetic method using hetero atoms to replace the AEL framework structure of a phosphoaluminate molecular sieve, and the method uses the hetero atoms of chlorine, titanium, cobalt, calcium, palladium, zinc, cerium, etc. as the materials of the hetero atoms to replace the AEL framework structure of the phosphoaluminate molecular sieve. In the synthesis process, aluminum isopropoxide or pseudo-boehmite is used as aluminum resources, and hexacosanoic propylamine and isopropylamine or the mixture of both are used as templates, thereby realizing the purposes of single feeding adoption, relatively mild crystallization condition, suitable water-solid ratio and great template dosage reduction. Once crystallization in the process can improve the crystallization efficiency, greatly improve the synthesis efficiency and control the formation of mixed crystal, having obvious advantages.

Description

technical field [0001] The invention relates to a synthesis method for substituting heteroatoms for aluminophosphate molecular sieves with an AEL skeleton structure, and belongs to the field of improvement and innovation of synthesis methods for straight-chain hydrocarbon skeleton isomerization catalysts. The method uses heteroatoms such as chlorine, titanium, cobalt, calcium, palladium, zinc, cerium and zirconium as heteroatom materials to replace the AEL framework structure of aluminophosphate molecular sieves, and aluminum isopropoxide or pseudo Boehmite is the aluminum source, and n-dipropylamine, isodipropylamine or a mixture of the two is used as the templating agent, so as to achieve the purpose of using one-time feeding, relatively mild crystallization conditions, suitable water-solid ratio, and greatly reducing the amount of templating agent. The primary crystallization in this process can increase the crystallization efficiency and greatly improve the synthesis effic...

AI Technical Summary

Problems solved by technology

The synthesis of aluminophosphate molecular sieve adopts the hydrothermal method. The process of this method is relatively simple, and the crystallization efficiency is high. The relative content of the template agent is too high, and often accompanied by the formation of some miscellaneous crystals, the synthesis efficiency is low, and the cost of the synthetic product is high, which limits the industrial application of this type of shape-selective molecular sieve