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Dissertations / Theses on the topic 'Zeolite NaA'

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Published: 5 June 2025

Last updated: 15 July 2025

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1

Mzinyane, Nozipho Nompumelelo. "Characterization of NaA-zeolite membranes using pervaporation / Nozipho Nompumelelo Mzinyane." Thesis, North-West University, 2005. http://hdl.handle.net/10394/974.

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Pervaporation has gained increasing attention as an energy saving process for separating azeotropes such as ethanol and water mixtures. Pervaporation distinguishes itself from other membrane processes in that it entails a phase transition step that occurs during the diffusion through the membrane, from the liquid phase in the feed to a vapor phase in the permeate. Pervaporation performance is mainly regulated by the physicochemical structure of the membrane rather than the vapor-liquid equilibrium of the system. A significant amount of literature is available to show the successful development

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2

Vicens, Jim. "Continuous Zeolite Crystallization in Micro-Batch Segmented Flow." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1307.

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Zeolites are porous aluminosilicates that occur both naturally and synthetically, having numerous applications in catalysis, adsorption and separations. Despite over a half century of characterization and synthetic optimization of hundreds of frameworks, the exact mechanism of synthesis remains highly contested, with crystallization typically occurring under transport-limited regimes. In this work, a microcrystallization reactor working under segmented oscillatory flow has been designed to produce a semi-continuous flow of zeolite A. The fast injection of the reactants in a mixing section form

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3

Pera, Titus Marc. "Preparation, characterization and modeling of zeolite NaA membranes for the pervaporation dehydration of alcohol mixtures." Doctoral thesis, Universitat de Barcelona, 2006. http://hdl.handle.net/10803/1530.

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Zeolite NaA membranes have attracted special attention in the last years in light of their high selectivities (>40000) and fluxes in the dehydration of alcohol/water mixtures. This Ph.D. thesis is aimed at developing new methods for zeolite NaA membrane synthesis together with the characterization of their mass transfer mechanisms for their further application in membrane reactors.<br/>The membranes have been prepared onto the outer and inner surface of ceramic tubular supports by in situ and seeded hydrothermal synthesis. To avoid the shortcoming of low accessibility to the lumen of the tubes

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4

Loiola, Adonay Rodrigues. "DiagÃnese sped up of kaolinm to the zeolite NaA (LTA)for use in the water softener." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1513.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Zeolite NaA (LTA) has been successfully synthesized by hydrothermal route, in which kaolim was used as silicon and aluminum source. The obtained zeolite was characterized by X-ray diffraction, X-ray absorption, thermogravimetry (TG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), infrared absorption spectroscopy (IR), luminescence and granulometry. The X-ray diffraction data refinement by Rietveld method and software DBWS9807 has made possible the confirmation of only one crystallographic phase on the

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5

Muvumbu, Jean-Luc Mukaba. "Cation-exchanged zeolites-A prepared from South African fly ash feedstock for CO2 adsorption." University of the Western Cape, 2015. http://hdl.handle.net/11394/4699.

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>Magister Scientiae - MSc<br>In South Africa coal combustion constitutes up to 90 % of the country’s energy need. This coal combustion activity is known to contribute to the amount of about 40 % of the total CO2 atmospheric emissions worldwide that are responsible for global warming effects. In addition burning of coal generates a large quantity of fly ash which creates environmental pollution since only a small portion of it is currently used in some applications. In order, on one hand to mitigate and sequester CO2 and on the other hand to reprocess fly ash and reuse it, this study focuses on

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6

Loiola, Adonay Rodrigues. "DiagÃnese acelerada de caulim Ã zeÃlita NaA para uso no abrandamento de Ãguas." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2665.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>A zeÃlita NaA (LTA) foi eficientemente obtida atravÃs de sÃntese hidrotÃrmica, onde o caulim foi usado como fonte de silÃcio e alumÃnio. A zeÃlita obtida foi caracterizada pelas tÃcnicas de difraÃÃo de raios-X, absorÃÃo de raios-X, termogravimetria (TG), calorimetria diferencial exploratÃria (DSC), microscopia eletrÃnica de varredura (MEV), espectroscopia de absorÃÃo na regiÃo do infravermelho (IV), luminescÃncia e granulometria. O refinamento dos dados obtidos nas anÃlises de difraÃÃo de raios-X, atravÃs do mÃtodo de Rietveld e do

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7

Tsapatsis, Michael Gavalas George R. "Composite inorganic membranes for gas separations : chemical vapor deposition of hydrogen permselective oxide membranes and preparation of supported zeolite NaA films /." Diss., Pasadena, Calif. : California Institute of Technology, 1994. http://resolver.caltech.edu/CaltechETD:etd-11102005-083452.

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8

Moodley, Shawn. "Gas separation of steam and hydrogen mixtures using an α-alumina-Alumina supported NaA membrane / by S. Moodley". Thesis, North-West University, 2007. http://hdl.handle.net/10394/1890.

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9

Sarialp, Gokhan. "Dehydration Of Aqueous Aprotic Solvent Mixtures By Pervaporation." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614157/index.pdf.

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Aprotic solvents are organic solvents which do not easily react with a substance dissolved in it and they do not exchange protons despite of their high ion and polar group dissolving power. Therefore, this characteristic property makes aprotic solvents very suitable intermediates in many industries producing pharmaceuticals, textile auxiliaries, plasticizers, stabilizers, adhesives and ink. Dehydration of these mixtures and recirculation of valuable materials are substantial issues in industrial applications. The conventional method for recovery of aprotic solvents has been distillation, which

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10

Povinelli, Ana Paula Ribeiro [UNESP]. "Otimização da síntese das zeólitas NaA e NaX utilizando radiação de micro-ondas para aplicação como agentes hemostáticos coagulantes." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151218.

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Submitted by Ana Paula Ribeiro Povinelli (paulinha-pol@hotmail.com) on 2017-07-26T19:45:49Z No. of bitstreams: 1 Dissertacao_Ana_FINAL.pdf: 3540005 bytes, checksum: d82bc4d015af48c2fda01a4eff17975f (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-07-26T20:13:00Z (GMT) No. of bitstreams: 1 povinelli_apr_me_sjrp.pdf: 3540005 bytes, checksum: d82bc4d015af48c2fda01a4eff17975f (MD5)<br>Made available in DSpace on 2017-07-26T20:13:00Z (GMT). No. of bitstreams: 1 povinelli_apr_me_sjrp.pdf: 3540005 bytes, checksum: d82bc4d015af48c2fda01a4eff17975f (MD5) P

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11

Кустовська, Антоніна Дмитрівна, Олена Іванівна Косенко, Вячеслав Васильович Трачевський, and Олена Володимирівна Ткаченко. "Preparation of metal-containing zeolites by plasma modification." Thesis, XIII Ukrainan-Polish Symposium Teoretical and Experimental Studies of Interfacial Phenomena and their Technological Appli-cations, September 11-14, 2012, Kyiv – Ukraine, p. 69, 2012. http://er.nau.edu.ua/handle/NAU/28838.

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Application of low-temperature plasma for metal-containing catalyst synthesis leads to several advantages. The first is the achievement of homogenous and finally dispersed distribution of metallic clusters. The other advantage of plasma chemical method is fast and cheap way of zeolites modifying.

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12

Velásquez, Yaneth Alejandra Flórez. "Membranas poliméricas de PVA modificas com zeólita NaA e líquido iônico para uso em célula a combustível de etanol direto." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/107022.

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Células a combustível de etanol direto (DEFC) são promissoras para a produção de energia elétrica a partir de uma fonte renovável e limpa. Neste tipo de célula o etanol sofre oxidação anódica direta produzindo prótons H3O+ liberando elétrons para o circuito externo com redução catódica do O2. Muitos desafios precisam ser superados para tornar esta tecnologia amplamente utilizável, como encontrar um eletrólito bom condutor de prótons, impermeável ao etanol e termicamente estável. Membranas de compósitos de poli (álcool vinílico) (PVA) com zeólita tipo NaA, previamente impregnada com o líquido i

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13

Pahlke, Hannes, Burkhard Geil, Danuta Kruk, and Franz Fujara. "The working range of static field gradient NMR illustrated by measurements of the intracrystalline diffusion of water in NaA-zeolites." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194906.

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14

Pahlke, Hannes, Burkhard Geil, Danuta Kruk, and Franz Fujara. "The working range of static field gradient NMR illustrated by measurements of the intracrystalline diffusion of water in NaA-zeolites." Diffusion fundamentals 3 (2005) 26, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14317.

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15

Povinelli, Ana Paula Ribeiro. "Otimização da síntese das zeólitas NaA e NaX utilizando radiação de micro-ondas para aplicação como agentes hemostáticos coagulantes /." São José do Rio Preto, 2017. http://hdl.handle.net/11449/151218.

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Orientador: Jose Geraldo Nery<br>Banca: Jorge Chahine<br>Banca: Ariano de Giovanni Rodrigues<br>Banca: Iêda Aparecida Pastre Fertonani<br>Resumo: A substituição da fonte de calor convencional por fontes de radiação de micro-ondas vem sendo bastante explorada na área de síntese de sólidos inorgânicos devido ao seu eficaz mecanismo de entrega de energia que proporciona rapidez no processo de síntese além de gerar materiais com maior pureza de fase. Neste contexto, o presente trabalho visou a otimização das sínteses das zeólitas NaA e NaX utilizando radiação de micro-ondas e a caracterização util

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16

KOUBI, LAURE. "Etude theorique par calculs ab initio de l'adsorption des molecules h#2, n#2 et o#2 dans la zeolithe naa." Paris 6, 1996. http://www.theses.fr/1996PA066214.

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Des calculs ab inition ont ete menes sur les molecules diatomiques h#2, n#2 et o#2 adsorbees dans la zeolithe naa. L'interaction avec le cristal a ete modelisee par les complexes x#2na#+, par x#2 en presence de plusieurs cations, ou d'un certain nombre de charges fractionnaires et enfin en presence d'un champ electrique uniforme. Apres l'etude des molecules diatomiques isolees, les geometries d'equilibre x#2na#+ et les deplacements de frequences de vibration par rapport aux molecules libres ont ete determines. Dans le cas des molecules h#2 et n#2, les resultats sont en accord avec les observat

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17

Кустовська, Антоніна Дмитрівна, and Олена Іванівна Косенко. "Efficiency of modyfied forms of natural zeolites in the processes of methanol transformation into components of motor fuel." Thesis, Авіація у XXI столітті. Безпека в авіації та космічні технології: VI Всесвітній конгрес, 23-25 вересня 2014 р.: тези доп. – К., 2014. – С. 5.1.10–5.1.12, 2014. http://er.nau.edu.ua/handle/NAU/28845.

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Usage of modified forms of rocks that contain the mixture of zeolites as catalyst of the process of methanol transformation into dimethyl ether and hydrocarbons was considered. Possibility in principal of usage of modified rocks containing mordenite and clinoptilolite as the catalyst of the process of methanol transformation was demonstrated.

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18

Mace, Amber. "Multiscale Modeling of Molecular Sieving in LTA-type Zeolites : From the Quantum Level to the Macroscopic." Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-113024.

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LTA-type zeolites with narrow window apertures coinciding with the approximate size of small gaseous molecules such as CO2 and N2 are interesting candidates for adsorbents with swing adsorption technologies due to their molecular sieving capabilities and otherwise attractive properties. These sieving capabilities are dependent on the energy barriers of diffusion between the zeolite pores, which can be fine-tuned by altering the framework composition. An ab initio level of theory is necessary to accurately describe specific gas-zeolite interaction and diffusion properties, while it is desirable

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19

Slimani, Oukacha. "Etude de l'adsorption des molecules ocs et cs::(2) dans les zeolites naa, nacaa et caa : determination des isothermes et chaleurs d'adsorption par spectroscopie infrarouge." Paris 6, 1987. http://www.theses.fr/1987PA066028.

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20

STEPHANIE, VICTOIRE FRANCOISE. "Adsorption et coadsorption des especes isotopiques de l'hydrogene moleculaire h#2, hd et d#2 dans la zeolithe naa. Thermogravimetrie, spectrometrie infrarouge et interpretation theorique." Paris 6, 1997. http://www.theses.fr/1997PA066730.

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L'etude de la molecule d'hydrogene et de ses especes isotopiques hd et d#2 adsorbees dans la zeolithe naa montre l'influence de la masse de l'adsorbat sur les phenomenes d'adsorption et de coadsorption. Puisque ces molecules ont la meme composition electronique et les memes dimensions, elles interagissent de facon similaire avec la zeolithe. La quantite de molecules adsorbees (isothermes d'adsorption) est plus importante pour les especes les plus lourdes. Cette difference avec la masse a ete expliquee par la variation de leur covolume, quantite liee aux mouvements au sein de la phase adsorbee.

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21

IBNASS, EL HABIB. "Contribution a l'etude de l'adsorption et de la coadsorption des molecules h#2 et d#2 dans la zeolithe naa par microgravimetrie et par spectrometrie infrarouge." Paris 11, 1991. http://www.theses.fr/1991PA112180.

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Ce travail est une contribution a l'etude de l'adsorption physique et de la coadsorption des molecules h#2 et d#2 dans un cristal microporeux la zeolithe naa, par microgravimetrie et spectrometrie infrarouge. La bande de vibration fondamentale de ces molecules diatomiques homopolaires, interdite en ir pour la phase gazeuse, apparait lorsque ces molecules sont adsorbees a l'interieur des cavites. La comparaison des isothermes des gaz purs a montre que le rapport des taux d'adsorption de d#2 sur h#2 est egal a 1. 1. Ceci est explique par la difference des covolumes de ces deux molecules. La mesu

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22

Tsapatsis, Michael. "Composite inorganic membranes for gas separations : chemical vapor deposition of hydrogen permselective oxide membranes and preparation of supported zeolite NaA films." Thesis, 1994. https://thesis.library.caltech.edu/4486/1/Tsapatsis_m_1994.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Hydrogen-perselective membranes were synthesized by chemical vapor deposition of SiO2, TiO2, Al2O3, and B2O3 layers within the pores of Vycor tubes. The deposition involved reaction of SiCl4, etc., with water at 100-800 [degrees]C depending on the chloride and the reaction geometry. The reactants were passed either through the bore of the support tube (one sided geometry) or separately through the bore and the outside surface of the support tube (opposing reactants geometry). Per

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23

Salman, Nada [Verfasser]. "Crystal chemical studies on the growth size problem of Y zeolite / von Nada Salman." 2006. http://d-nb.info/983831068/34.

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24

Кустовська, Антоніна Дмитрівна. "The influence of chemical modification on adsorption properties of natural zeolites." Thesis, 2016. http://er.nau.edu.ua/handle/NAU/28847.

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The influence of decationization and dealumination on adsorption of water with rock from Transcarpathian deposit (Lypcha village, Ukraine) containing mordenite and clinoptilolite in the ratio 1:1 was studied. The obtained results can be used for preparation of adsorbents for dehydration of gases and organic liquids.

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