Oxygen Reduction Reaction
Mostrando 13-24 de 168 artigos, teses e dissertações.
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13. Kinetic modeling and microbial assessment by fluorescent in situ hybridization in anaerobic sequencing batch biofilm reactors treating sulfate-rich wastewater
This paper reports the results of applying anaerobic sequencing batch biofilm reactors (AnSBBR) for treating sulfate-rich wastewater. The reactor was filled with polyurethane foam matrices or with eucalyptus charcoal, used as the support for biomass attachment. Synthetic wastewater was prepared with two ratios between chemical oxygen demand (COD) and sulfate
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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14. Evaluation of the corrosion behavior of the al-356 alloy in NaCl solutions
Cellular metals are a new class of materials with promising applications and a unique combination of physical, chemical and mechanical properties. The Al-356 alloy is used to manufacture metal foams from NaCl preforms. Despite the usefulness of these materials, their performance may be affected by corrosion due to residual salt. This paper reports the study
Química Nova. Publicado em: 2011
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15. Tratamento de efluente tÃxtil utilizando o processo foto-fenton / Treatment of textile effluent using photo-fenton process
The aim of this work was to study the performance of the photo-Fenton process using both the artificial UV and solar sources on the textile effluent treatments. Preliminary photo-Fenton experiments for mineralization and degradation of organic and inorganic pollutants as well as of synthetic dyes were carried out in order to assess the best experimental cond
Publicado em: 2011
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16. Reaproveitamento de óxidos de manganês de pilhas descartadas para eletrocatálise da reação de redução de oxigênio em meio básico
The oxygen reduction reaction was studied in alkaline media using manganese oxides obtained from spent batteries as electrocatalysts. Three processes were used to recover manganese oxides from spent batteries. The particles obtained were in the range from 8 to 11 nm. The electrochemical experiments indicated a good electrocatalytic activity toward oxygen red
Química Nova. Publicado em: 2010
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17. Pt-Cu/C and Pd Modified Pt-Cu/C electrocatalysts for the oxygen reduction reaction in direct methanol fuel cells
Neste trabalho, foram preparados diferentes eletrocatalisadores de Pt-Cu e de Pt-Cu modificados com Pd, suportados em carbono por meio da redução química de precursores de Pt, Cu e Pd com borohidreto de sódio. A atividade eletrocatalítica frente à reação de redução de oxigênio foi estudada. A análise dos resultados de difração de raios X mostro
Journal of the Brazilian Chemical Society. Publicado em: 2010
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18. Investigação da enzima Bilirrubina oxidase como catalisador da reação de redução eletroquímica de oxigênio / Investigation of the enzyme Bilirubin Oxidase as a catalyst for the oxygen electrochemical reduction reaction
Bilirrubina oxidase de Myrothecium verrucaria é uma multicobre oxidase capaz de reduzir O2 pela oxidação de fenóis, aminas aromáticas e polipirróis. Eletroquimicamente, essa reação de redução ocorre pela transferência de elétrons entre a enzima e um eletrodo. Nesta tese, foi investigada a eficiência da enzima como agente redutor de O2 na superf�
Publicado em: 2010
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19. Estudo dos efeitos de contaminadores sobre o desempenho das células a combustível de membrana de eletrólito polimérico / Diagnosing the effects contaminants have over polymer electrolyte membrane fuel cells
Os componentes do conjunto membrana/eletrodos (MEA) das células a combustível de membrana de eletrólito polimérico/Polymer Electrolyte Membrane Fuel Cells (PEMFC) são sensíveis a impurezas, as quais podem vir do ar, do gás combustível e/ou da degradação dos componentes do módulo. Amônia, sulfeto de hidrogênio e monóxido de carbono são juntos o
Publicado em: 2010
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20. Modulação da secreção de insulina por estresse oxidativo induzido em ilhotas pancreáticas de animais submetidos à desnutrição protéica / Oxidative stress modulation of insulin secretion in protein undernourished rats pancreatic islet
Protein malnutrition induces pacreatic B-cells molecular alterations, reducing insulin secretion. It has been recently demonstrated that redox status may control insulin secretion under physiological conditions. However, protein malnutrition effects in redox modulation of insulin secretion is unknown. Thus, our aim was to evaluate oxidative stress impact upo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/12/2009
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21. Study of oxygen reduction reaction in acidic media on platinum and palladium electrocatalysts supported on carbon / Estudo da reação de redução de oxigênio em meio ácido em eletrocatalisadores de platina e paládio dispersos em carbono
Oxygen reduction reaction (ORR) on platinum-palladium electrocatalysts supported on carbon was studied in H2SO4 electrolyte. The structure of the catalysts was characterized by XRD (X-ray diffractometry) and the composition was determined by EDX (Energy dispersive X-ray spectroscopy). The electronic properties were investigated by in situ XAS (X-ray absorpti
Publicado em: 2009
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22. Óxidos do tipo perovskita para reação de redução de no com CO
In this work, the perovskite-type oxides LaNiO3, LaMnO3, La0,7Sr0,3NiO3 and La0,7Sr0,3MnO3 were prepared by co-precipitation and tested in the NO reduction with CO at 400 and 500 ºC for 10 h. The catalysts were characterized by X-ray diffraction, temperature programmed reduction with hydrogen, nitrogen adsorption and chemical analysis. The nonstoichiometric
Química Nova. Publicado em: 2009
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23. Estudo do desempenho e degradação de catalisadores e membranas em células a combustível de eletrólito polimérico / A performance and degradation study of catalysts and membranes for proton exchange fuel cell
In this work, the oxygen reduction reaction (ORR) was studied on nano-particulated Pt and PtM (M = Co, Cr, Fe e Ni) alloy electrocatalysts supported on carbon, prepared by an impregnation method, for utilization on polymer electrolyte fuel cell (PEFC). The physical properties of the materials have been investigated by energy dispersive X-ray analyses (EDX),
Publicado em: 2009
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24. Gold nanocatalysts: preparation, characterization and catalytic performance / Nanocatalisadores de ouro: preparação, caracterização e desempenho catalítico
Gold in the bulk form has been regarded to be an uninteresting metal from the point of view of catalysis, as it is chemically inert towards chemisorption of reactive molecules such as oxygen and hydrogen. However, the catalytic properties of gold are revealed when the size is reduced to few nanometers, particularly with dimension less than 10 nm. Therefore,
Publicado em: 2009