Synthesis of Zeolite Y and Adsorption Study

• Main Authors: Shen-Hua Huang, 黃聖樺
• Other Authors: Richard S. Horng
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/19854542865584278723

碩士 === 義守大學 === 生物技術與化學工程研究所碩士班 === 94 === Zeolites are highly crystalline, porous aluminosilicates. The structure of zeolites possess the three-dimensional structure of the SiO4 and AlO4 tetrahedron, each of which contains a silicon atom or aluminum atom in the center. The oxygen atoms are located between adjoining tetrahedron. Zeolites are recognized to be good molecular sieves because of their vast surface area and unanimous pore size. In the research, we successfully synthesized zeolite with industrial materials under controlling conditions: Na2O：Al2O3：SiO2 = 4.5：1：10, 92％ H2O, aging for 24 hours, hydrothermal for 8 hours, washing and then drying. The solid products were zeolite NaY that was characterized by FTIR, XRD and 29Si NMR. A sufficient quantity of binder（9.5wt％ PVA） and the zeolite powder are mixed, dried and calcined at 430℃to prepare pellet form of zeolite. The specific surface area of pellets is comparable to that of the commercial (CBV300, Zeolyst). The adsorption column filled with the pellets is prepared by random stacking and inlet VOCs was introduced continuously to investigate their adsorption properties - breakthrough time and adsorption capacity. As operation conditions are ：gas flowrate 1.0 L/min, and gas concentrations varied from 130 ppmv, 930 ppmv to 2500 ppmv, the adsorption capacity increased but breakthrough time decreased with the increase of inlet gas concentration. As operation conditions are ：gas concentration 2500 ppmv, and inlet flowrates varied from 0.6 L/min, 1.0 L/min to 2.1 L/min, the adsorption capacities are almost unchanged but breakthrough time decreased. These breakthrough curves are good sigmoid, demonstrating narrow mass-transfer zones and effectiveness of adsorption.