Zeolites

Robert W. Broach

Robert W. Broach

UOP LLC, A Honeywell Company, Des Plaines, Illinois, United States, 60017

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Deng-Yang Jan

Deng-Yang Jan

UOP LLC, A Honeywell Company, Des Plaines, Illinois, United States, 60017

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David A. Lesch

David A. Lesch

UOP LLC, A Honeywell Company, Des Plaines, Illinois, United States, 60017

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Santi Kulprathipanja

Santi Kulprathipanja

UOP LLC, A Honeywell Company, Des Plaines, Illinois, United States, 60017

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Eckehart Roland

Eckehart Roland

Degussa AG, ZN Wolfgang, Hanau, Germany

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Peter Kleinschmit

Peter Kleinschmit

Degussa AG, ZN Wolfgang, Hanau, Germany

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First published: 15 April 2012
Citations: 9

Abstract

The article contains sections titled:

1.

Introduction

2.

Nomenclature

3.

History

4.

Structure, Composition, and Properties

4.1.

Framework Structure

4.2.

Nonframework Cations

4.3.

Chemical and Physical Properties

4.3.1.

Physical Properties

4.3.2.

Chemical Properties

5.

Characterization

6.

Occurrence, Mining, and Processing of Natural Zeolites

7.

Production of Synthetic Zeolites

7.1.

Chemistry of Zeolite Synthesis

7.2.

Composition of Reaction Mixtures

7.3.

Raw Materials

7.3.1.

Synthesis Conditions

7.3.2.

Examples of Industrial Zeolite Syntheses

7.3.3.

Post Synthesis Treatments

7.3.4.

Environmental Aspects

8.

Commercial Applications and Importance

8.1.

Natural Zeolites

8.2.

Synthetic Zeolites

8.2.1.

Adsorption

8.2.2.

Membranes

8.2.3.

Catalysis

8.2.4.

Other Uses

9.

Toxicology

Zeolites are hydrated aluminosilicates with a three-dimensional framework structure constructed of SiO4 and AlO4 tetrahedra linked through oxygen atoms. They contain regular channels or interlinked voids whose aperture diameters are in the micropore range. The regular nature of the channels and apertures, whose dimensions are of the same order of magnitude as molecular diameters, enables the zeolites to function as molecular sieves and gives them value as selective adsorbents for separating substances and as shape-selective catalysts. This article gives an overview of history, structure, properties, occurrence, production, and applications of zeolites.

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