Mesoporous Solids
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Influence of Aluminum Addition in the Framework of MCM-41 Mesoporous Molecular Sieve Synthesized by Non-Hydrothermal Method in an Alkali-Free System
Purely siliceous MCM-41 and Al-containing MCM-41 (Al-MCM-41) mesoporous materials were synthesized by non-hydrothermal method in alkali-free ions medium at room temperature and short reaction times. Under these synthesis conditions, it was also investigated the influence of Al incorporation in the crystal structure of MCM-41. The solids were characterized by
Mat. Res.. Publicado em: 17/08/2017
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2. NON-CRYSTALLINE COPPER OXIDE HIGHLY DISPERSED ON MESOPOROUS ALUMINA: SYNTHESIS, CHARACTERIZATION AND CATALYTIC ACTIVITY IN GLYCEROL CONVERSION TO ACETOL
Polymeric precursor method and wet impregnation route were applied to synthesize copper and aluminium-based catalysts in order to obtain a material with interesting properties in catalytic reactions. The changes in the structural, morphological and textural properties due to the choice of preparation method were characterized by different techniques, such as
Quím. Nova. Publicado em: 2016-07
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3. Study on the adsorption of heavy metal ions from aqueous solution on modified SBA-15
Amino-functionalized SBA-15 mesoporous silica was prepared, characterized, and used as an adsorbent for heavy metal ions. The organic - inorganic hybrid material was obtained by a grafting procedure using SBA-15 silica with 3-aminopropyl-triethoxysilane and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272), respectively. The structure and physicochemic
Mat. Res.. Publicado em: 05/04/2013
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4. AdsorÃÃo de MolÃculas Sulfuradas AromÃticas em Adsorventes Mesoestruturados à Base de SÃlica. / Adsorption of aromatic sulfur molecules on mesostructured silica adsorbents.
The demand of a larger control in the emission of pollutants from automobiles, with a reduction in the emission of sulfur, has led to an intense research effort on techniques of sulfur removal from fuels. In the last few years, adsorption is thought to be a suitable polishing technique to achieve a deep desulfurization of streams from hydrodesulfurization (H
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2011
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5. Hidroxiapatita mesoporosa pura e modificada organicamente com grupos nitrogenados síntese, caracterização e uso como carreadora de fármacos / Pure Mesoporous Hydroxyapatite and Modified Organically with Nitrogen-containing Groups - Synthesis, Characterization and Use as Drug Delivery Materials
Materiais mesoporosos apresentam um arranjo de poros ordenados e uma distribuição de poros muito estreita aliada a altas áreas superficiais, que são características estruturais interessantes para adsorção e liberação de moléculas bioativas. Outra característica relevante desses sólidos é a presença dos grupos hidroxilas livres nas paredes dos p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/10/2010
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6. Synthesis, characterization and catalytic activity of mesoporous materials Al-MCM-41 in transesterification reaction of cottonseed oil / Síntese, caracterização e avaliação catalítica do aluminossilicato mesoestruturado AI-MCM-41 na transesterificação de óleos vegetais
Molecular sieves have been applied to the processing of triacylglycerols, to produce biofuels. In this context, the mesoporous catalyst Al-MCM-41 was proposed in this work as an alternative to acid heterogeneous transesterification of cottonseed oil with ethanol. This material was prepared using various Si/Al molar ratios (25, 50, 75 and 100) with reaction t
Publicado em: 2010
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7. Obtaining magnesium and vanadium catalysts supported on activated carbon for the production of styrene. / Obtenção de catalisadores de vanádio e magnésio suportados em carvão ativado para a produção de estireno.
The main route industrially used for styrene production is the ethylbenzene catalytic dehydrogenation, responsible for more than 90% of its worldwide capacity. The industrial process is performed at the temperature range of 550-700 C with an excess of heated steam over potassium and chromium-promoted iron oxide catalysts, which are toxic and have 2-year life
Publicado em: 2008
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8. Perovskitas contendo lantânio, ferro e cobalto - melhoramento de propriedades texturais via síntese por nanomoldagem e avaliação como catalisadores na redução de NO com CO
Mixed oxides with perovskite structure have high potential as catalysts in gas depollution processes and particularly in the abatement of nitrogen oxides (NOx). Such solids could be considered as a promising alternative for the replacement of noble metals based catalysts, whose use is predominant. Great flexibility of composition, easy synthesis, low cost an
Publicado em: 2008
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9. Preparação e caracterização de catalisadores de níquel suportado em óxido de zircônio e aluminio.
Alumina-supported nickel has been extensively used to catalyze the methane steam reforming because of its low cost, as compared to noble metal-based catalysts. However, it is not stable during the reaction mainly due to phase transition and sinterization. This calls for the development of new catalysts. An attractive option would be the use of zirconia-based
Publicado em: 2005
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10. Sintese e caracterização de titanoaluminofosfatos mesoporosos, meso-TAPO
The aim of this Dissertation is the synthesis and characterization of molecular sieves with an inorganic titaniumaluminumphosphates framework and a mesoporous structure. For the synthesis of such materials, two experimental approaches were investigated, based on previous experiments that determined the initial parameters for the hydrolysis of the titanium so
Publicado em: 2003