dc.contributorPergher, Sibele Berenice Castella
dc.contributorhttp://lattes.cnpq.br/4868316066791900
dc.contributorhttp://lattes.cnpq.br/5249001430287414
dc.contributorPenha, Fábio Garcia
dc.contributorhttps://orcid.org/0000-0002-5587-873X
dc.contributorhttp://lattes.cnpq.br/0866082836928725
dc.contributorOliveira, Fernando José Volpi Eusébio de
dc.contributorhttps://orcid.org/0000-0003-2811-8433
dc.contributorhttp://lattes.cnpq.br/5600786330033497
dc.contributorBieseki, Lindiane
dc.contributorhttp://lattes.cnpq.br/4894556873583410
dc.contributorSapag, Manuel Karim
dc.contributorBraga, Tiago Pinheiro
dc.creatorSouza, Damiana Sinézio de
dc.date.accessioned2022-05-17T22:20:43Z
dc.date.accessioned2022-10-06T13:14:07Z
dc.date.available2022-05-17T22:20:43Z
dc.date.available2022-10-06T13:14:07Z
dc.date.created2022-05-17T22:20:43Z
dc.date.issued2021-08-06
dc.identifierSOUZA, Damiana Sinézio de. Inserção controlada de pilares de óxido de alumínio em argilas bentonitas. 2021. 114f. Tese (Doutorado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2021.
dc.identifierhttps://repositorio.ufrn.br/handle/123456789/47203
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3965763
dc.description.abstractClays are minerals widely available in nature. They are applied as catalysts in various chemical processes, such as oil cracking, and chemical transformations in soils. Some specific clays (such as bentonites) have characteristics that allow us to modify their properties, such as increased specific area, increased active sites and greater thermal stability. Among the chemical modification processes of clays, there is pillarization, which consists of inserting pillars between the lamellae, increasing the basal spacing and consequently the accessibility of the clay galleries, thus intensifying its adsorptive and catalytic characteristics. A system for the synthesis of pillarization with Al30 was studied, which made it possible to obtain a material with properties superior to those synthesized using traditional methods with Al13. In order to obtain Al30 and its use for pillaring bentonite clays, the following synthesis parameters were studied: study of preexpansion of clay [with cetyltrimethylammonium hydroxide (CTMA-OH), tetrapropylamonium hydroxide (TPA-OH) ) and ethyleneglycol (EG)]; temperature, time and molar ratio [OH]/[Al] in the preparation of the pillaring solution; The synthesis temperature of the pillaring solution as well as the heating time together proved to be the primary factor in relation to the size of the basal spacings. The concentration of reagents also contributed to obtain Al30. The best results were obtained for the pillaring solution with ratio [OH]/[Al] = 2.4; temperature of 95°C for 12 h. The results showed that it is possible to obtain some control over the insertion and size of columns in pillars with bentonite-type clays by adjusting the parameters of the synthesis system commonly used for pillars with Al13.
dc.publisherUniversidade Federal do Rio Grande do Norte
dc.publisherBrasil
dc.publisherUFRN
dc.publisherPROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA
dc.rightsAcesso Aberto
dc.subjectArgilas
dc.subjectKeggin
dc.subjectPilarização
dc.subjectA113
dc.subjectA130
dc.subjectMinerologia
dc.titleInserção controlada de pilares de óxido de alumínio em argilas bentonitas
dc.typedoctoralThesis


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