Faujasite
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Reordering of Depolymerized Silicates as Adsorbents for Large Nitrogen Compounds
The adsorption capacities of two synthesized zeolites (crystalline ZSM-5 and semi-crystalline faujasite Y) for a mixture of indole, quinoline and carbazole were studied. The different samples obtained show different crystalline degree, mesoporosity and Si/Al ratios. The synthesis procedure is based on the simultaneous depolymerization of a mixture of high su
J. Braz. Chem. Soc.. Publicado em: 2021-01
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2. PROPRIEDADES E AVALIAÇÃO CATALÍTICA DA ZEÓLITA X NANOMÉTRICA CONTENDO CÁTIONS METILAMÔNIO
The reduction of zeolite particle is one of the main features currently searched; it is due to the catalytic gains that these materials come in some reactions. In this work two faujasite zeolites of type X were evaluated, a micrometer and nanometric. Zeolites in sodium form were exchanged ionically with methylammonium cations. These materials were evaluated
Quím. Nova. Publicado em: 2016-07
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3. THEORETICAL STUDY OF CO2:N2 ADSORPTION IN FAUJASITE IMPREGNATED WITH MONOETHANOLAMINE
Abstract Many efforts have been made to develop amine-based solid adsorbents for capture of CO2 by adsorption. Compared with the traditional process of absorption in aqueous solutions of amines, the adsorbents with amine immobilized in solids generally result in processes with lower capital and energy costs. The literature contains some experimental studies
Braz. J. Chem. Eng.. Publicado em: 2015-09
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4. Preparação e propriedades de zeólitas faujasita contendo cátions amônio
Sodium faujasite zeolites with Si/Al ratio of 1.4 and 2.5 were exchanged with methylammonium cations. The influence of framework aluminum and ion exchange degree in their basic properties were evaluated. These properties were assessed in the Knoevenagel catalytic condensation. The sodium ion exchange was restricted to the supercavity and the exchange degree
Química Nova. Publicado em: 2010
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5. Synthesis and properties of zeolite FAU with nanocrystals / Síntese e propriedades da zeólita FAU com cristais nanométricos
A zeólita FAU foi obtida em diferentes quantidades de água. Nos níveis mais altos e baixos de quantidade de água as intensidades dos picos de difração tornam-se menos intensos. O resultado de fisissorção dessas amostras sugere a presença de material não cristalizado ainda presente no produto. As micrografias de varredura mostram grandes partículas
Publicado em: 2010
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6. Gas separation unit by adsorption : simulation and adsorbent characterization / Unidade de separação de gases por adsorção : simulação e caracterização do adsorvente
Zeolites are crystalline porous materials found naturally or synthetically manufactured with high adsorbent power. The study of this material as an industrial adsorbent began in the mid 50 s. The fields of zeolite application are rather wide. Zeolites have been used as adsorbents for purification of gases and liquids, as catalysts for petroleum refinig and f
Publicado em: 2009
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7. Aplicação de peneiras moleculares contendo cátions orgânicos em catálise básica
This thesis was aimed at studying novel basic catalysts based on molecular sieves containing alkylammonium cations. The studied molecular sieves were faujasite zeolites (FAU) and mesoporous silicate (like MCM-41). The following parameters were evaluated: (1) different alkylammonium cations, (2) different amount of alkylammonium cations and (3) application of
Publicado em: 2008
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8. Purificação de acido clavulanico utilizando zeolitas. / Purification of clavulanic acid using zeolites.
In this research work, a method for separation and purification of clavulanic acid from a fermented medium was studied using natural and synthetic zeolites. The natural zeolite (ZN) and synthetic faujasite (13X) were modified by ionic exchange with different compensation cations (Na+1, K+1, Ca+2, Ba+2, Mg+2, Sr+2). The kinetic analysis by adsorption of clavu
Publicado em: 2008
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9. Utilização de zeólitas sintetizadas a partir de xisto retortado na remoção de arsênio em águas contaminadas
The solid by-product of the oil shale processing (PETROBRAS - Brazil) was used as raw material to synthesize zeolites A and faujasite. Alkaline fusion followed by hydrothermal treatment was the synthesis procedure used, and five different starting material compositions were obtained. The more crystalline zeolite-type materials synthesized, the pretreated oil
Química Nova. Publicado em: 2007-10