High silicon super stabilizing natural foresite and it preparation process

Abstract

A natural high-Si desmine with super thermal stability (more than 1000 deg. C) and open artery structure is prepared from natural STI zeolite through acid exchange, ammonium exchange, calcining, ammonium fluorosilicate exchange and calcining.

Description

technical field [0001] The invention belongs to the technical field of modification of natural zeolite materials, and in particular relates to a high-silicon super-stable natural stilbite and a preparation method thereof. Using natural STI zeolite as raw material, through dealumination and silicon supplementation modification methods, such as acid exchange, ammonium exchange and then roasting, ammonium fluorosilicate exchange and then roasting, etc., to obtain high-silicon natural STI zeolite (Si / Al>7.0), its pore The structure is open and perfect, and the thermal stability of the structure reaches above 1000°C. Background technique [0002] Zeolite molecular sieve is an inorganic aluminosilicate or phosphate crystal, the skeleton contains regular and orderly arranged pores or cages of molecular size (ca. It is widely used in industrial catalysis, adsorption separation and ion exchange. [0003] It is a kind of natural stilbite found in Beijing area of ​​my country. It ...

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Problems solved by technology

However, the template used in the literature is difficult to prepare and the cost is high, and the composition ratio range of the synthetic reactants is very narrow, and the silicon-aluminum ratio of the product is difficult to continue to increase.

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