INVESTIGATION OF THERMAL AND STRUCTURAL PROPERTIES OF NITRIC, HYDROCHLORIC AND SULPHURIC ACID-TREATED ZEOLITE

Authors : Meryem AKBELEN, Çağatay EZBER

Pages : 114-119

Doi:10.18038/estubtda.647910

View : 16 | Download : 10

Publication Date : 2019-12-16

Article Type : Research Paper

Abstract :  In this study, in order to consider the effect of the hydrochloric acid insert ignore into journalissuearticles values(HCl);, nitric acid insert ignore into journalissuearticles values(HNO 3 ); and sulphuric acid insert ignore into journalissuearticles values( H 2 SO 4 ); treatments on thermal and structural properties, zeolite was modified with 1 M acid solutions at 70 o C during 4 h using batch method. The structural and thermal properties of zeolites were studied by X-ray diffraction insert ignore into journalissuearticles values(XRD);, X-ray fluorescence insert ignore into journalissuearticles values(XRF);, thermogravimetric analysis insert ignore into journalissuearticles values(TG);, differential thermogravimetric analysis insert ignore into journalissuearticles values(DTG); and differential thermal analysis insert ignore into journalissuearticles values(DTA);. Quantitative XRD analysis show that the natural zeolite mainly consists of mordenite and clinoptilolite with varying amounts of quartz, feldspar and clay mineral. TG-DTG and DTA curves of all zeolite samples were obtained in the temperature range between 30 and 1000 o C. Based on the TG results, the total mass losses for all acid-treated samples insert ignore into journalissuearticles values(8.51-8.44 %); are less than that of the natural insert ignore into journalissuearticles values(Z); sample insert ignore into journalissuearticles values(10.14 %);.  SiO 2 / Al 2 O 3 ratio of the natural zeolite sample insert ignore into journalissuearticles values(Z); increased from 5.6 to 9.8, 9.7 and 8.8 in the Z-N, Z-H and Z-S samples, respectively, indicating the removal of the significant amount of aluminum from the zeolite structure. 
Keywords : Natural zeolite, Clinoptilolite, Mordenite, XRD, XRF, TGA DTG DTA