123rd General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Exhibition Hall 2
Time 4월 18일 (목요일) 11:00~12:30
Code INOR.P-3
Subject Key factors determining the gas adsorption performance of zeolite granules
Authors Ahreum Hwang
Global Technology Center, Samsung Electronics Co., Ltd., Korea
Abstract Nanoporous materials including zeolite, activated carbon, alumina, and silica have characteristics such as high surface area, high adsorption capacity, ion exchange properties and high catalytic activity, and they have been applied to various fields such as catalysis, adsorption, separation, electronics, and semiconductors. In particular, zeolite has a pore diameter of 3–10 Å, which exhibits a molecular sieving effect, and can selectively adsorb nitrogen molecules in the air using their porous structure and high surface area. However, despite the selective adsorption characteristics of zeolite, the average particle size in zeolite is in the form of a fine powder of several micrometers, and thus there are many limitations to its use as a gas adsorbent. Therefore, zeolites are often granulated by adding binders, which can improve their handling and mechanical strength. However, the addition of a binder may also decrease the adsorption performance. Therefore, we have analyzed the surface of zeolite granules, their pore size and porosity using SEM, gas adsorption, and porosimetry methods. In order to evaluate the air adsorption performance of granulated zeolite, the pressure change in the chamber of a certain volume was measured. As a result, the key factors related to the gas adsorption performance of zeolite granules were discovered. The evaluated granular zeolites have similar specific surface areas to provide gas adsorption performance, but there was a difference in their granular size and shape. In the case of zeolite I, which exhibits a large gas adsorption capacity, its pore size (300 – 400 μm) was larger than those observed for zeolite II by ~100 μm, and a large number of micropores were observed on the granulated surface. These results suggest that the surface micropores provide the primary diffusion pathway for air, which can increase the internal surface area and improve the air adsorption performance.
E-mail ar.hwang@samsung.com