Preparation Of Zeolite Molecular Sieves From Natural Mineral Illite

Zeolites are crystalline microporous aluminosilicate,which has precisely defined nanoscale cages and channels.Many of them exist in the form of natural minerals.They are the most widely used adsorbents in the world,and are one of the synthetic varieties of catalysts and ion exchange materials.Zeolite crystals are porous on the molecular scale,and their structure reveals that the regular channels and the resulting molecular sieves from the hole array make it possible to produce a new selective separation process(ion exchange,adsorption),and in its acid form,zeolite may be the most important heterogeneous acid catalyst used in industry.Most of the gasoline in the world is produced by catalytic cracking of petroleum with zeolite catalyst.Their key characteristics are size and shape selectivity,and strong acid potential.In view of the industrial importance of zeolite and the complexity of its structure and the inherent scientific interest of many kinds of chemistry,considerable efforts have been put into the synthesis of zeolites.The main goal of this work is to synthesize new materials and enhance understanding of the synthesis process.In this research system,the physical and chemical properties of natural mineral illite were investigated,and then 4A zeolite molecular sieves and ZSM-5 zeolite molecular sieves were prepared for different activation modes of illite,and the adsorption rate of calcium ions was measured on 4A zeolite molecular sieves.A series of continuous microwave hydrothermal devices were prepared.Zeolite molecular sieves are prepared.The following work has been completed:(1)The illite stone mine of Antu County,Yanbian,Jilin Province,which was purified,was used as a node at 50 degrees centigrade,and the high temperature calcined activation treatment was taken,and the oil absorption,specific surface area and pore size distribution of the products after the calcined activation were measured.The results showed that the oil absorption value of illite decreased rapidly with the specific surface area calcined at 900 ?.(2)To prepare 4A zeolite molecular sieves by different activation methods of illite,by adjusting the value of n(SiO2):n(Ai2O3),n(Na2O):n(SiO2),in order to adjust the temperature,time and proportioning ratio of the water,the zeolite molecular sieves of different sizes are prepared for the way of calcining and activation at high temperature,and the result table is obtained.The size and morphology of 4A zeolite prepared by different activation methods are different.The physicochemical properties of 4A zeolite for detergents were studied for 4A zeolite prepared by different activation methods.The results show that the adsorption capacity of 4A zeolite prepared by the activation of illite by high temperature alkali fusion is higher than that of 4A zeolite prepared by the illite activated by high temperature calcination.(3)The illite activated by alkali was treated by acid washing,and the products of silicon aluminum gel were obtained and ZSM-5 zeolite molecular sieves were prepared and characterized by scanning electron microscopy and X ray diffraction.The results show that with the addition of the dosage of template agent and the amount of sodium hydroxide,with the increase of the dosage of the template,the alpha-sio2 clutter is formed,and the relative crystallinity of ZSM-5 begins to decrease,and the ZSM-5 is completely converted to the stationary quartz.When the initial gel n(Na2O)/n(SiO2)is from low to critical,the pure phase of ZSM-5 is produced.With the continuous increase of sodium hydroxide,the alpha-SiO2 clutter begins to appear,and the diffraction peak of ZSM-5 begins to decrease,and the metastable ZSM-5 zeolite is completely converted to the zeolites.(4)A continuous microwave water heating device has been developed for the above experiments.