Basic Catalysis
Mostrando 13-24 de 51 artigos, teses e dissertações.
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13. SÃntese de esferas hÃbridas e seu desempenho na reaÃÃo de desidrogenaÃÃo do etilbenzeno na presenÃa de diÃxido de carbono / Synthesis of hybrid spheres and their performance in the dehydrogenation reaction of ethylbenzene in carbon dioxide presence
The various possibilities of application of the mesoporous materials, such as catalysis and adsorption, it have encouraged the research in the synthesis of these materials. In addition, but less frequent, synthetic routes have been searched in order to obtain a material whose structure and grain size allow its application in industrial reactors, without the
Publicado em: 2009
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14. Esterificação de ácido oléico sobre catalisadores mesoporosos tipo SO4-2/MCM-41 visando a produção de biodiesel
Climatic changes, largely induced by the use of fossil fuels and the concern with the sustainable development, has become renewable sources of energy extremely important. Nowadays, renewable sources of energy can be obtained, among several available processes, starting from transesterification, esterification and pyrolysis reaction. The esterification reacti
Publicado em: 2009
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15. Studies of residual oils originating from of processo f fry and qualification of those for obtaining of monoésteres (Biodiesel). / Estudos de óleos residuais oriundos de processo de fritura e qualificação desses para obtenção de monoésteres (Biodiesel).
Biodiesel is now considered as an important option for full or partial diesel fossil replacement. At the same time, biodiesel is a renewable and an environmentally friendly fuel. This work has as goal to employ residual vegetable oils for biodiesel production and evaluate its viability as raw material. For that, some initial steps were considered in order to
Publicado em: 2008
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16. Analysis of direct mono, di, triacylglyceride into biodiesel by high resolution gas chromatography: the resolution ANP 42 and its extensions / Análise direta de mono, di e triacilglicerídeos em biodiesel por cromatografia gasosa de alta resolução: resolução ANP 42 e suas extensões
Biodiesel is chemically defined as fatty acid mono-alkyl esters derived of vegetable oils, animal fats or discarded greases. The process more commonly employed for biodiesel production is transesterification catalyzed by base. The quality control of the produced biodiesel is essential for its use as fuel. The National Agency of Petroleum (ANP) establishes di
Publicado em: 2008
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17. Produção de biodiesel a partir de óleo de coco (Cocos nucifera L
The production of biodiesel has become an important and attractive process for the production of alternative fuels. This work presents a study of the biodiesel production from coconut oil (Cocos nucifera L.), by two routes: direct transesterification using NaOH as catalyst and esterification (with H2SO4) followed by basic transesterification. The reactor was
Publicado em: 2008
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18. Synthesis of TIO2 colloidal nanocrystals by solvothermal method / Síntese de nanocristais coloidais de TiO2 via método solvotermal
This work presents a systematic study about preparing titanium oxide nanoparticles by solvothermal method. TiO2 is a much studied material because its applications in areas like catalysis, sensors, energy conversion devices, and others. It is speculated that all this technologies can be promoted by using nanostructured oxide. In order to confirm this, it is
Publicado em: 2008
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19. Obtenção de ésteres etílicos e metílicos, por reações de transesterificação, a partir do óleo da palmeira Latino Americana macaúba - Acrocomia aculeata / Isolation of methilic and ethilic esters, by transferification reactions, from macauba trees oils- , Acrocomia aculeata
Ethyl esters and methyl esters (biodiesel) from oils of the fruits of the palm tree macauba (Acrocomia aculeata) were obtained by transesterification reactions performing the alcoholysis (methanolysis and ethanolysis) under homogeneous basic catalysis (using KOH, NaOH, CH3CH2OK, CH3CH2ONa CH3OK and CH3ONa), under homogeneous acid catalysis (using HCl and H2S
Publicado em: 2007
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20. Fenilsilicato dopado com Eu III obtido pelo método sol-gel
In this work, we report the synthesis and the photoluminescence features of a Eu(III)-doped modified silica matrix obtained by the sol-gel method. The matrix was prepared by reaction between tetraethylorthosilicate and phenyltriethoxysilane alkoxide. The hydrolysis occurred using basic catalysis. The solids were treated at 100, 200 and 300 ºC during 4 h and
Química Nova. Publicado em: 2007
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21. Modulation in pharmacological action of botropics and crotalics PLA2 in presence of an lectin isolated from marine alga Bryothammion triquetrum / Modulação da ação farmacologica de PLA2 botropicas e crotalicas em presença de uma lectina isolada da alga marinha Bryothamnion triquetrum
Lectins are proteins that bind specifically and reversibly to carbohydrates. They are widely distributed among living organisms and show many activities of biological and medical interest. In this work, two isoforms of lectins isolated from the red marine alga Bryothamnion triquetrum were purified by ion exchange followed by reverse phase chromatographies. T
Publicado em: 2007
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22. Aplicação catalítica de peneiras moleculares básicas micro e mesoporosas
Catalysis by solid acids has received much attention due to its importance in petroleum refining and petrochemical processes. Relatively few studies have focused on catalysis by bases and even les on using basic molecular sieves. This paper deals with the potential application of micro and mesoporous molecular sieves in base catalysis reactions. The paper is
Química Nova. Publicado em: 2006-04
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23. Synthesis of MCM-41 Mesoporous Molecular Sieves Actives in the Basic Catalysis to form Chalcones / Síntese de Peneiras Moleculares MCM-41 Ativas em Catálise Básica para a Produção de Chalconas
Samples of MCM-41 mesoporous molecular sieves were synthesized from a gel presenting the following molar composition: 1,0 SiO2: 0,12 CTABr: 0,28 TMAOH: 100 H2O. The gel was hydrothermally treated or at 100C for 24 hours or at 150C for 5 days, forming Si-MCM-41 samples. After, calcining at 540C, for removing surfactant, freeing the porosity, these samples wer
Publicado em: 2006
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24. Synthesis and characterization of Rare Earth compounds with potencial appplication in ionizing radiation detection / Síntese e caracterização de compostos de terras raras com potencial aplicação na detecção de radiação ionizante
Rare Earth (RE) inorganic phosphors play an important role as ionizing radiation detectors when applied to medical imaging techniques like radiology and tomography. These phosphors is to convert the high energy radiation absorbed photons (X or ?-rays) into visible photons, leading to better quality images and reducing the time the patient is exposed to radia
Publicado em: 2006