Iron Catalysts
Mostrando 37-48 de 65 artigos, teses e dissertações.
-
37. Comparative study of hydrocarbon oxygenation with ironchlorins and ironporphyrins as catalysts in homogeneous and heterogeneizated systems / Estudo comparativo da oxigenação de hidrocarbonetos com ferroclorinas e ferroporfirinas como catalisadores em meio homogêneo e heterogeneizados
In this work, the cyclohexane oxidation and the (Z)-cyclooctene epoxidation with iodosylbenzene (PhIO) e H2O2 as oxidants were studied. A comparison between fluorinated FeIIIchlorins and FeIIIporphyrins, [Fe(TFPCMG)]Cl, [Fe(TFPCMGCH3)]Cl2, [Fe(TFPP)]Cl, [Fe(TF4TMAPP)](CF3SO3)5 as catalysts was made either in solution or supported in silica matrices via eletr
Publicado em: 2008
-
38. PreparaÃÃo de carvÃo ativado e impregnaÃÃo com ferro ou cromo para aplicaÃÃes em processos de descontaminaÃÃo ambiental. / Preparation and impregnation of activated carbons with iron or chromium for aplication on environmental descontamination processes.
This work has five chapters, with objective of the preparation of activated carbons (AC) from agroindustrial residues (coffee hulls and wet blue leather) and preparation of catalysts using these AC for degradation of organic compounds. In the first chapter is showed a review from the literature about AC, the surface characterisitics and properties, the uses
Publicado em: 2008
-
39. Síntese e caracterização de catalisadores de óxido de ferro suportado em titanatos lamelares / Synthesis and characterization of layered titanates supported iron oxide catalysts
Os catalisadores de óxido de ferro suportados em trititanato de sódio e trititanato com sílica foram preparados por coprecipitação de íons ferro e por deposição de nanopartículas de óxido de ferro previamente preparadas. Os catalisadores e os suportes foram caracterizados quanto à composição, estrutura, comportamento térmico e propriedades text
Publicado em: 2008
-
40. Síntese e caracterização de catalisadores de óxido de ferro suportado em titanatos lamelares / Synthesis and characterization of layered titanates supported iron oxide catalysts
Os catalisadores de óxido de ferro suportados em trititanato de sódio e trititanato com sílica foram preparados por coprecipitação de íons ferro e por deposição de nanopartículas de óxido de ferro previamente preparadas. Os catalisadores e os suportes foram caracterizados quanto à composição, estrutura, comportamento térmico e propriedades text
Publicado em: 2008
-
41. Síntese e avaliação de óxido de ferro suportado em carvão ativado polimérico como catalisador na desidrogenação do etilbenzeno
In this work, activated carbon were synthesized through carbonization of a polymer, containing iron oxides with and without copper. The precursor of activated carbon was a styrenedivinylbenzene copolymer (StyDVB) synthesized through suspension polymerization, in the presence of inert diluentes to obtain a macroporous structure. The resin was sulfonated with
Publicado em: 2007
-
42. ProduÃÃo de Hidrocarbonetos atravÃs da SÃntese de Fischer-Tropsch utilizando Catalisadores de Fe/K / Production of hydrocarbons through Fischer-Tropsch Synthesis of using catalysts of Fe / K
A reaÃÃo de sÃntese de Fischer-Tropsch tem merecido grande atenÃÃo pelo seu interesse tecnolÃgico e cientÃfico. Este interesse està associado a conversÃo do gÃs natural em produtos lÃquidos de alta qualidade (gasolina e diesel) e elevado valor agregado. No presente trabalho à descrito a metodologia empregada na sÃntese e caracterizaÃÃo de cata
Publicado em: 2007
-
43. Caracterization and oxidation of organic compounds in wastewater from wet processing of coffee berries. / CaracterizaÃÃo e oxidaÃÃo de compostos orgÃnicos nas Ãguas residuÃrias da despolpa Ãmida dos frutos do cafeeiro.
The wet processing of coffee berry is one of the most pollutant activities in brazilian agriculture. The main disadvantage of this method is the large volume of water used, wich returns to the environment with low quality. The goal of this work was to study the organic composition of the wastewater, as well as to prepare and test catalysts in order to oxidiz
Publicado em: 2006
-
44. Development of alternative catalysts for the reduction of nitrogen oxides with carbon monoxide in plants of fcc. / Desenvolvimento de catalisadores alternativos para a redução de óxidos de nitrogênio com monóxido de carbono em plantas de fcc.
Recentemente, o desenvolvimento de tecnologias eficientes visando à redução dos óxidos de nitrogênio, em regeneradores de unidades de craqueamento catalítico em leito fluidizado, tem se tornado uma grande preocupação, devido aos rigorosos limites de emissão impostos pela legislação ambiental. Como a maioria das refinarias utiliza promotores de com
Publicado em: 2006
-
45. Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites
Fe-ZSM-5 catalysts were prepared by ion exchange in aqueous medium or in the solid state and tested in the catalytic reduction of NO with iso-butane. X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), electron paramagnetic resonance spectroscopy (EPR), X-ray absorption spectroscopy (XANES, EXAFS), temperature-programmed reduction by H2 (H2
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09
-
46. Influência do método de preparação nas propriedades do óxido de ferro suportado. / Influence of preparation method on properties of iron oxide supported.
Styrene is one of the most important basic chemicals to produce valuable commodities such as polystyrene, acrylonitrile-butadiene-styrene and styrene-butadiene-styrene. It is commercially produced by the dehydrogenation of ethylbenzene in the presence of large amounts of steam at high temperatures of 600-700 oC. This process is thermodynamically limited and
Publicado em: 2005
-
47. CATALYSTS SUPPORTED IN MICRO AND MESOPOROUS MOLECULAR SIEVES FOR THE FISCHER- TROPSCH SYNTHESIS / CATALISADORES SUPORTADOS EM PENEIRAS MOLECULARES MICRO E MESOPOROSAS PARA A SÍNTESE DE FISCHER-TROPSCH
The Fischer- Tropsch synthesis converts the synthesis gas (H2 + CO), in a complex variety of hydrocarbons, using a catalyst (Co/Al2O3 normally) were introduced to the used supports by the wetness incipient impregnation. The samples were analyzed by several techniques such as: plasma- emission spectrometry (ICP- EAS), N2 physical adsorption by BET method, X-r
Publicado em: 2004
-
48. ESTUDO DA INTERAÇÃO METAL-SUPORTE EM CATALISADORES DE RUTÊNIO PROMOVIDOS POR BÁRIO E CÉSIO PARA A SÍNTESE DE AMÔNIA / THE STUDY OF METAL-SUPPORT INTERACTION ON BARIUM AND CESIUM PROMOTED RUTHENIUM CATALYSTS FOR THE AMMONIA SYNTHESIS
The industrial ammonia synthesis process uses a triple promoted iron catalyst, operating at drastic temperature conditions between 673K and 973K, and high pressure (300atm). New catalysts have been studied, replacing iron, to increase NH3 production. The main advantage of Ru-based catalysts is that they are less sensitive to poisoning by ammonia than Fe-base
Publicado em: 2004