What Is Zeolite?
Zeolite is a crystalline aluminosilicate compound composed of aluminum, silicon and oxygen, and it can occur naturally or be synthesized artificially. These materials have a nanometer-scale micropore structure that allows them to selectively adsorb a wide range of substances. The chemical formula of zeolite is generally expressed as Na2O·Al2O3·xSiO2·yH2O, indicating that it is made up of sodium, aluminum, silicon, oxygen and water.
Types of Zeolite
Zeolite is divided into several types, each with different properties and applications. The main types include 3A, 4A, 5A, 13X and Y-type (USY, sodium/hydrogen). Each zeolite has a different micropore size and adsorption characteristic, so they are used across a variety of industrial fields. For example, 4A zeolite is mainly used as a detergent builder and is attracting attention as an environmentally friendly alternative to phosphates.
- 3A Zeolite: Used mainly as a molecular sieve, adsorbing water and other small molecules.
- 4A Zeolite: The most widely used as a detergent builder, serving as a substitute for phosphates.
- 5A Zeolite: Used for ion exchange and gas separation.
- 13X Zeolite: Suitable for gas adsorption and separation.
- Y-Type Zeolite: Used as a major industrial catalyst.
Applications of Zeolite
The main applications of zeolite include detergent builders, desiccants, gas separation agents, ion exchangers and crude oil refining catalysts. When used as a detergent builder in particular, it functions as an environmentally friendly substitute for phosphates.
- Detergent Builder: Zeolite improves the cleaning power of detergents and reduces environmental impact by replacing phosphates.
- Desiccant: Thanks to its moisture-absorbing properties, zeolite is used as a desiccant.
- Gas Separation Agent: Used in PSA (Pressure Swing Adsorption) processes to concentrate oxygen and nitrogen.
- Ion Exchanger: Used to lower water hardness.
- Catalyst: Used as a catalyst for crude oil refining and chemical reactions.
Physicochemical Properties of Zeolite
Zeolite has a nanometer-scale micropore structure that gives it excellent selective adsorption and thermal stability. This enables a wide range of industrial applications, and its physicochemical properties are as follows.
- 4A Zeolite Properties: Active content >80 wt%, bulk density 0.25–0.35 g/cm³, pH 10.0–11.4, whiteness >96 L value, particle size 2.0–3.5 μm, Ca binding capacity >300 mg CaCO₃/g
- Chemical Composition (4A): Na₂O 17–18%, Al₂O₃ 28.5–29.5%, SiO₂ 33–34.5%, H₂O 18–21%
FAQ
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In what forms is zeolite supplied? Zeolite is supplied in powder, granule and slurry forms.
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Is zeolite environmentally friendly? Yes, zeolite can replace phosphates and is recognized as an environmentally friendly material.
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Who are the main suppliers of zeolite? In Korea, ZeoBuilder and Cosmo Catalyst are leading suppliers, while globally there are Thermo Fisher and Sigma-Aldrich.
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What is the adsorption function of zeolite? Zeolite can selectively adsorb substances through its nanometer-scale micropore structure.
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What is the role of zeolite in the PSA process? In the PSA process, zeolite helps separate oxygen and nitrogen.
Learn about the various applications of zeolite | Zeolite as a detergent builder