Borohydride Oxidation
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Addition of CeO2 Nanorods in PtSn-Based Electrocatalysts for Ethanol Electrochemical Oxidation in Acid Medium
This work describes the preparation of Pt/C, PtxSny/C and PtxSny(CeO2 nanorods/C) nanoparticle catalysts synthesized by the chemical reduction method via sodium borohydride for the ethanol oxidation reaction. Using X-ray diffractogram analysis, it was verified that no alloy formation occurred between platinum (Pt) and tin (Sn). The distribution of the nanopa
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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2. ESTUDO DA REAÇÃO DE REDUÇÃO DE OXIGÊNIO SOBRE ELETRODOS À BASE DE TETRAMETÓXIFENILPORFIRINAS PARA APLICAÇÕES EM CÉLULAS A COMBUSTÍVEL DE BOROIDRETO DIRETO / STUDY OF THE OXYGEN REDUCTION REACTION ON ELECTRODES BASED OF TETRAMETÓXIFENILPORFIRINAS FOR APPLICATIONS IN CELLS FUEL BOROHYDRIDE DIRECT
The oxygen reduction reaction (ORR) in 1.0 mol/L KOH solutions catalyzed by FeTMPP/C and CoTMPP/C was investigated in absence and presence of BH4- anions with concentrations varying from 10-7 to 1.0 mol/L. Similar cyclic voltammetry and rotating disk electrode experiments have been also performed the commercial E-TEK Pt/C electrocatalysts. In absence of BH4-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/06/2012
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3. Fenômenos não-lineares na eletro-oxidação do íon boroidreto / Non-linear phenomena during borohydride electro-oxidation
Apesar de toda a atenção dada à eletro-oxidação do íon boroidreto, pela possibilidade de seu uso em células a combustível, pouco se tem discutido a respeito das instabilidades cinéticas associadas a esse processo. A maioria das pesquisas tem como foco o estudo da cinética dos processos na região de baixos sobrepotenciais, numa região relativament
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/05/2012
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4. Eletrocatálise das reações catódica e anódica em célula a combustível alcalina de borohidreto direto / Electrocatalysis of anodic and cathodic reaction in direct borohydride fuel cell
A reação de redução de oxigênio (RRO) e a reação de oxidação do borohidreto (ROB) foram estudadas em eletrólito alcalino em eletrodos formados por diversos tipos de óxidos de manganês dopados com Ni (II) dispersos sobre carbonos Monarch 1000, MM225 e E350. As técnicas de caracterização físico-química foram difração de raios X (DRX), micros
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/10/2011
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5. Preparação e caracterização de eletrocatalisadores PtRu/C, PtBi/C, PtRuBi/C para eletro-oxidação direta de etanol em células a combustível tipo PEM utilizando metodologia da redução via borohidreto de sódio / Preparation and characterization of PtRu/C, PtBi/C, PtRuBi/C electrocatalysts for direct eletro-oxidation of ethanol in PEM fuel cells using the method of reduction by sodium borohydride
Os eletrocatalisadores Pt/C, PtBi/C, PtRu/C e PtRuBi/C foram preparados a partir do método de redução via borohidreto de sódio e testados na oxidação eletroquímica de etanol. No método de redução via borohidreto, adiciona-se uma solução contendo hidróxido de sódio e borohidreto de sódio a uma mistura contendo água/2-propanol, precursores met�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2010
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6. The impact of kappa number composition on eucalyptus kraft pulp bleachability
Consumption of chemicals during ECF bleaching of kraft pulp correlates reasonably well with kappa number, which measures with KMnO4 the total amount of oxidizable material in the pulp. However, the method does not distinguish between the oxidizable material in residual lignin and other structures susceptible to oxidation, such as hexenuronic acids (HexAs), e
Brazilian Journal of Chemical Engineering. Publicado em: 2007-03
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7. Reduction of iron oxides by reaction with sodium borohydride / Redução de óxidos de ferro por reação com borohidreto de sódio
xviii The chemical reduction of transition metal ions in solution by action of the borohydride group ion has been applied by several researchers attempting to synthesize amorphous Fe-B alloys. In this project iron-oxide particles suspended in water, rather than ions in solution, were used for that purpose. The reducing chemical was chosen to be sodium borohy
Publicado em: 2005
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8. A INIBIÇÃO DA ENZIMA δ-AMINOLEVULINATO DESIDRATASE POR MONOSSACARÍDEOS NÃO É MEDIADA PELA OXIDAÇÃO DE GRUPOS -SH
Heme pathway enzyme δ-aminolevulinate dehydratase (δ-ALA-D) is a good marker for oxidative stress and metal intoxication. This sulfhydrylic enzyme is inhibited in several oxidative pathologies like lead, mercury and aluminum intoxication, selenium organic species exposition and diabetes. Oxidative stress is one of cause of diabetes complications. T
Publicado em: 2004
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9. Synthesis of AminoaÃÃcares and Compostos GlicoheterocÃclicos / SÃntese de AminoaÃÃcares e Compostos GlicoheterocÃclicos
In the present work, the synthesis of new 2,3-unsaturaed glycosides, amino and branchedchain amino sugars is reported. Reaction of tri-O-acetyl-D-glucal (20) with five alcohols 72a-e using Ferrierâs method provided 2,3-unsaturatd glycosides 73a-e. Deacetylation of compounds 73a-e followed by allylic oxidation furnished enones 75a-e, which are important prec
Publicado em: 1997
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10. Polietileno pre-tratado para adesão : caracterização das superficies tratadas e obtenção de juntas adesivas
Low-density polyethylene (LDPE) exposure to aqueous KMnO4 solution has two major consequences: polymer coating with MnO2 and (slower) its corrosion. MnO2- coated LDPE can be used to prepare adhesive joints with a peel strenght >1,6 kNm (LDPE-MnO2 undergoes cohesive fracture). MnO2 is found by scanning electron microscopy to have a porous gel structure. The L
Publicado em: 1987
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11. Chemical reduction of oxidized human lymphocytes inhibits interleukin 2 production but not induction of interleukin 2 responsiveness.
Treatment with neuraminidase (NA) plus galactose oxidase (GalOxase) does not cause stimulation of human thymocytes. However, stimulation can be achieved by addition of exogenous interleukin 2 (IL-2). The IL-2-induced stimulation was inhibited with anti-Tac antibody, indicating that NA/GalOxase-oxidized cells can serve as inducers of functional IL-2 receptors
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12. Analysis of the envelope of Rauscher murine oncornavirus: in vitro labeling of glycopeptides.
The identity and localization of the oligosaccharides of Rauscher murine type C viral glycoproteins have been examined by techniques of in vitro labeling. Terminal sialic acid was labeled with tritium by borohydride reduction after selective periodate oxidation, and galactose was labeled by borohydride reduction after specific enzymatic oxidation of the nonr