Preparation And Characterization Of Tungsten Oxide Mesoporous Materials

As a newly development of nanophase materials,mesoporous materials attract high attention in the section of science&technology.The ordered mesoporous have high surface area,adjustable of uniform channels(2～50nm),ordered morphology,high thermal stability and hydrolysis,and it has a wide range of applications in the area of separation,adsorption,catalysis,biologicalmaterial,information material, nanotube of carbon.In this paper,we focused on the synthesis of mesoporous materials by using cationic surfactant(CTAC) and KIT-6 as the template.And several methods such as XRD,HRTEM and nitrogen adsorption-desorption isotherms were employed to characterize the mesoporous tungsten oxides.The primary content is including:1.Mesoporous tungsten oxide is synthesized by hydrolytic condensation employing cationic surfactant cetyl trimethyl ammonium chloride (CTAC) as template and using sodium tungstate as inorganic precursor. And investigated the effect of mol ratio of CTAC and sodium tungstate, the value of pH,condensation time.2.Mesoporous tungsten oxide is synthesized by hydrolytic condensation employing cationic surfactant cetyl trimethyl ammonium chloride (CTAC) as template and using sodium tungstate as inorganic precursor. Then inject the TEOS to create the complex mesoporous material of tungsten oxide and silicon dioxide.And character the complex mesoporous material.3.Mesoporous tungsten oxide is prepared by method of hard temple employing mesoporous silica dioxide as the temple and silicotungstic acid(H₄O₄₀SiW₁₂·nH₂O) inorganic precursor.The influences of the mixing ratio of the silicotungstic acid and mesoporous silica,calcined temperature of mixture,and different dispersants to prepare the mesoporous tungsten oxides with better framework were investigated.