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Sustainable Gas Separation by Application of Natural Zeolites as Membranes and Adsorbents Open Access

Descriptions

Other title
Subject/Keyword
Gas separation
Zeolite
Clinoptilolite
Adsorption
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Farjoo, Afrooz
Supervisor and department
Kuznicki, Steven, Department of Chemical and Materials Engineering, University of Alberta
Examining committee member and department
McCaffrey, William, (Chemical and Materials Engineering)
Gupta, Rajender, (Chemical and Materials Engineering)
Hashisho, Zaher, (Civil and Environmental Engineering)
Tezel, Handan, (Chemical and Biological Engineering, University of Ottawa)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2016-08-08T14:59:32Z
Graduation date
2016-06:Fall 2016
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 membrane as well as adsorptive gas separation processes. Membrane-based processes have the potential to overcome the limitations of conventional gas separation techniques such as high-energy consumption and environmental concerns. Natural zeolite membranes have recently been shown to demonstrate potential in separation of H2 from H2/CO2 mixtures or H2/Light hydrocarbon mixtures and can be used as a model for development of robust molecular sieve membranes with superior separation characteristics. Recently, disc membranes generated from high purity natural clinoptilolite mineral rock showed promising gas separation performance. In this study a new strategy for scaling up the production of these types of membranes for industrial applications was applied and developed in different configurations such is disk or tubular. The membranes’ permeation, separation performance and separation mechanisms were evaluated using different characterization methods and tests at different conditions. The results showed that natural zeolite membranes such as compact disk or coated stainless steel tubular ones have great potential for large-scale gas separation at high temperature and pressures. To evaluate the potential of membranes in industrial applications, single versus multicomponent gas permeance was compared and discussed. In another study, a new adsorbent for the adsorptive separation of ethylene from ethane as one of the most energy intensive separations was created by incrementally changing the pore size of clinoptilolite. The structure of a naturally occurring clinoptilolite was modified through ammonium exchange, calcination, and post-calcination steam treatment. The results demonstrated the potential to use steamed clinoptilolite to increase the efficiency of the adsorptive separation of ethane and ethylene. Results of this work indicate that natural zeolites can be applied as robust membranes and manipulated as unique adsorbents for enhanced gas separation. With further research, natural zeolites could serve as economically feasible membranes and adsorbents for countless industrial processes.
Language
English
DOI
doi:10.7939/R30P0WZ8X
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Chapter 3 of this thesis has been published as A. Farjoo, J. Sawada, and S. Kuznicki, “Manipulation of the pore size of clinoptilolite for separation of ethane from ethylene” Journal of Chemical Engineering Scinece, 2015, 138, 685-688.Chapter 5 of this thesis has been accepted for publication in Canadian Journal of Chemical Engineering as A. Farjoo, A. Avila and S. Kuznicki, “H2 separation using pressed clinoptilolite and mixed copper-membranes”.Chapter 6 of this thesis has been accepted for publication in Canadian Journal of Chemical Engineering as: Afrooz Farjoo, Steven Kuznicki, “H2 separation using tubular stainless steel supported natural clinoptilolite membranes”

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