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dc.contributor.advisorCarreon, Moises A.
dc.contributor.authorWu, Ting
dc.date.accessioned2018-10-12T17:29:58Z
dc.date.accessioned2022-02-03T13:14:36Z
dc.date.available2019-04-11T17:29:58Z
dc.date.available2022-02-03T13:14:36Z
dc.date.issued2018
dc.identifierWu_mines_0052E_11582.pdf
dc.identifierT 8592
dc.identifier.urihttps://hdl.handle.net/11124/172548
dc.descriptionIncludes bibliographical references.
dc.description2018 Summer.
dc.description.abstractThe main objective of this work is the development of continuous crystalline microporous molecular sieve membranes to separate Kr/Xe and air/Xe gas mixtures. Specifically, for Kr/Xe separation we demonstrate that ZIF-8 and AlPO-18 membranes can effectively separate Kr/Xe gas mixtures. For air/Xe separation, we demonstrate the first examples of any porous crystalline membrane to separate air/Xe gas mixtures. In the case of Kr/Xe separation, the best ZIF-8 membranes separated Kr/Xe mixtures with Kr permeances as high as 50.8 GPU and separation selectivities as high as 16.1. AlPO-18 membranes showed the highest Kr/Xe separation selectivity of 7.9 and an unprecedented Kr permeance as high as 940 GPU. For air/Xe separation we demonstrate that ZIF-8 and SAPO-34 membranes can separate this gas mixture effectively. Specifically, our best ZIF-8 membranes showed air permeances as high as 118 GPU and separation selectivities as high as 12.4 for air/Xe gas mixtures. SAPO-34 membranes’ air/Xe separation performance exceeded that of ZIF-8, showing air permeances as high as 690 GPU and separation selectivities of 30.1. Molecular sieving, competitive adsorption, and differences in diffusivities were identified as the separation mechanisms for both gas mixtures. Among these mechanisms, molecular sieving and differences in diffusivities were the dominant mechanisms leading to Kr and air selective membranes. This work represents one of the first known examples of microporous crystalline membranes with molecular sieving properties to separate Kr/Xe and air/Xe gas mixtures. The proposed separation technology represents an attractive alternative route to cryogenic distillation, typically employed to separate these gases.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2018 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectgas separation
dc.subjectmolecular sieve
dc.subjectxenon recovery
dc.subjectkrypton
dc.subjectair separation
dc.subjectnanoporous
dc.titlePorous crystalline molecular-sieve membranes for xenon separation from krypton and air
dc.typeText
dc.contributor.committeememberSum, Amadeu K.
dc.contributor.committeememberTrewyn, Brian
dc.contributor.committeememberGomez-Gualdron, Diego A.
dcterms.embargo.terms2019-04-11
dcterms.embargo.expires2019-04-11
thesis.degree.nameDoctor of Philosophy (Ph.D.)
thesis.degree.levelDoctoral
thesis.degree.disciplineChemical and Biological Engineering
thesis.degree.grantorColorado School of Mines
dc.rights.accessEmbargo Expires: 04/11/2019


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