Abstract
In this study, a comparison of a variety of existing acid treatment methods for zeolite based on their abilities to modify physical properties of the particles is performed. Evaluation of the effects that four different acids have on numerous properties of the zeolites including surface area, pore size, pore volume, thermal stability, IR spectra, crystallinity, and morphology is conducted and compared with the reference untreated zeolite. Furthermore, all five zeolite particles are evaluated for their adsorption properties in column mode experiments. The importance of the examined features is discussed. The results obtained in this work are compared to similar studies to examine which conditions greatly influence the zeolite modifications.
Highlights
Zeolite, both naturally occurring and synthetically produced contains many unique properties
Pore sizes for hydrochloric, nitric, and sulfuric acid treatments were moderately reduced by approximately 10 - 13 Å, acetic acid shows a dramatic increase with 92.464 Å
The results indicate that there was no significant modification to the clean zeolite using the glacial acetic acid, sulfuric, nitric, and hydrochloric acids show substantial surface modification
Summary
Both naturally occurring and synthetically produced contains many unique properties. A majority of the naturally occurring material is formed through a combination of oceanic and volcanic processes over long periods of time. Most of the zeolite composition is dominated by alumina and silica; the metal cations are found in much smaller quantities as they are predominantly found on the zeolite surface. These tetrahedral structures arrange themselves into a greater network of channels and pores [2]. Several variations of these arrangements give rise to specified zeolite cage types that include; fujaste, sodalite, and type A
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