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Permanent link (DOI): https://doi.org/10.7939/R3H08J

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Advances in molecular sieves and their applications in adsorptive gas separation processes Open Access

Descriptions

Other title
Subject/Keyword
Separation
Molecular Sieves
Zeolites
Adsorption
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Lin, Christopher C. H.
Supervisor and department
Kuznicki, Steven (Chemical and Materials Engineering)
Examining committee member and department
Xu, Zhenghe (Chemical and Materials Engineering)
Sacco, Jr., Albert (Chemical Engineering, Northeastern University)
Stryker, Jeffrey (Chemistry)
Choi, Phillip (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2009-08-20T15:31:26Z
Graduation date
2009-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
The objective of this research was to develop new molecular sieve materials and to examine their applications in adsorptive gas separation processes. Several techniques to modify zeolite molecular sieve materials were developed, including a new pore size control mechanism and novel surface modification procedures. The new materials derived from these modification techniques were found to be potentially useful in many adsorptive gas separation processes. A novel mechanism was developed to systematically control the pore size of titanium silicate molecular sieves through halogen substitution of terminal hydroxyl groups. These halogen containing zorites represent a new class of size-selective adsorbents with readily tailored and highly specific pore sizes. Anion-controlled titanium silicates were demonstrated to have promise in multiple areas of size-based separation, particularly light hydrocarbon purification and permanent gas separation. By controlling the type and quantity of the extra-framework cations, titanium silicate molecular sieve adsorbents were modified to separate ethylene and ethane by either the kinetic phenomenon or an equilibrium process. All of these modification techniques were synergistically integrated to illustrate that multi-functional adsorbents can be designed and prepared for many target separations. This approach was demonstrated through the separations of CO2/C2H6 and CO2/CH4. Anion-controlled adsorbents were modified to selectively exclude ethane and methane by the steric effect, while the equilibrium and kinetic properties of the adsorbents were concomitantly adjusted by surface modification. The concept of gas adsorption and separation through nanometals interaction was introduced. Surface-supported nanometals, such as nanosilver, formed on titanium silicate ETS-10 were applied as unique adsorbents to separate gas mixtures, such as Ar/O2 and N2/O2. Continual research and development in new molecular sieve materials will be crucial to the future of the chemical processing industry, and should be viewed as an avenue for the discovery of next-generation adsorptive gas separation technologies.
Language
English
DOI
doi:10.7939/R3H08J
Rights
License granted by Christopher Lin (ccl2@ualberta.ca) on 2009-08-18T22:19:23Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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