Synthesis and Characterization of Zeolites by Conventional and Microwave-Assisted Methods Using(2-Hydroxyethyl)-trimethylammoniunl Hydroxide as a Template

摘要

Different types of zeolites were synthesized using two different techniques:conventional hydrothermal synthesis(CHS)and microwave-assisted hydrothermal synthesis(MAHS)using(2-hydroxyethyl)trimethylammonium hydroxide(2-HETMAOH)as a template.The influence of the chemical composition of the starting sol and hydrothermal synthesis parameters,i.e.,MW power,heating time,number of synthesis steps,conditions on the formation of zeolite by MAHS and CHS methods were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and IR spectroscopy.Zeolites obtained by conventional heating had irregular shapes,while these form microwave irradiation had regular rounded shapes.In both cases,in the presence of template,samples contained particles with sizes between 12 and 15 mu m,and the samples without a template had spherical morphology with average particle size of 6 mu m.