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Date of Award

1963

Document Type

Dissertation - Pacific Access Restricted

Degree Name

Doctor of Philosophy (Ph.D.)

Department

Graduate School

First Advisor

Milton E. Fuller

First Committee Member

Herschel Frye

Second Committee Member

Carl Wulfman

Third Committee Member

Howard K. Zimmerman

Fourth Committee Member

Emerson G. Cobb

Abstract

It has been found that there exist certain crystalline aluminosilicates which provide regular net-works of channels with diameters no bigger than those of molecules. Such crystals can act as sieves (thus the name "molecular sieves" now marketed by the Linde Air Products Company) and bring about a separation of molecular species by occluding small molecules while not adsorbing larger molecules or molecules with shapes that do not "fit."

The aluminosilicates were termed zeolites first by Baron Cronstedt (1) some 200 years ago. He observed that certain mineral crystals, when heated, appeared to melt and to boil at the same time. Thus, from the Greek "zeo," to boil, and "lithos," stone, Cronstedt coined the term "zeolite."

The use of zeolite (molecular sieves) has increased during the past several years. The earlier work (1930- 1950) involved the study of the naturally occurring zeolites. During the last ten years the activity has been concerned with the use of synthetic crystalline zeolites in separating both gaseous and liquid components by the molecular sieve action,

Pages

91

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