Acetaldehyde And Acetic Acid
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Metal-Supported Niobium Catalysts Investigation for Conversion of Bio-Renewable Glycerol to Organic Compounds
The glycerol oxidative dehydration to organic compounds, especially acrolein and acrylic acid, was studied over vanadium, molybdenum, and cobalt oxides supported on niobium oxide and niobium phosphate catalysts. At 300 °C, the glycerol conversion was 100% over all catalysts tested, and acrolein was the main product observed, without significant deactivation
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Análise multiparamétrica da qualidade dos frutos, mostos e vinhos de jabuticaba / Multiparametric analysis of quality of fruits, musts and wines jabuticaba
Chemical parameters were monitored during the jabuticabas development, fermentation and ageing of its wine, by quantitative 1H NMR, spectrophotometric assays and standard methods of analysis. Data collected were analysed by variance (ANOVA), principal components (PCA), hierarchical cluster (HCA) and canonical correlation analyses (CCA). Jabuticabas developme
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/06/2012
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3. Platinum and nioubium based catalysts for the anode of polymer electrolyte membrane fuel cells fed with low molecular weight alcohols / Catalisadores a base de platina e nióbio para o ânodo da célula a combustível de membrana trocadora de prótons alimentada com alcoóis de baixa massa molecular
In this work, the methanol and ethanol electrochemical oxidation reactions are studied on platinum (Pt) and niobium (Nb) catalysts supported on high surface area carbon. The selected materials were PtNb/C, Pt-Nb2O5(amorphous) /C e Pt-Nb2O5(crystalline) /C, using as reference for comparison purposes the commercial catalyst 20% Pt-C E-TEK. The catalysts were p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/01/2012
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4. A fração volátil das aguardentes de cana produzidas no Brasil
The volatile fraction of sugar cane spirits plays a key role in the quality and acceptance of these beverages. The composition of this fraction is dependent on the way sugar cane collection, fermentation, distillation and aging are carried out. The materials used in these processes strongly influence chemical composition. Acetic acid, acetaldehyde, ethyl ace
Quím. Nova. Publicado em: 2012
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5. Composição química e propriedades funcionais no processamento de vinagres / Chemical composition and functional properties in the processing fo vinegar
The fruit vinegars increasingly become popular on the planet, being produced from various crops or their residues, using classical and modern techniques. These products have great variety of organic acids, vitamins, minerals, phenolic compounds and other elements with important physiological functions. Vinegar higher quality depends more on their secondary c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011
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6. Teores de compostos orgânicos em cachaças produzidas na região norte fluminense - Rio de Janeiro
This work aimed to quantify some organic compounds in "cachaças" (sugar cane spirit). The ethyl alcohol was quantified by densimetry, after distillation. The acetic acid, methyl alcohol, n-propyl alcohol, n-butyl alcohol, isobutyl alcohol, isoamyl alcohol (mixture of 2-methyl-butyl and 3-methyl-butyl), ethyl acetate and acetaldehyde were determined by gas c
Química Nova. Publicado em: 2009
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7. Distinção entre cachaças destiladas em alambiques e em colunas usando quimiometria
One hundred fifteen cachaça samples derived from distillation in copper stills (73) or in stainless steels (42) were analyzed for thirty five itens by chromatography and inductively coupled plasma optical emission spectrometry. The analytical data were treated through Factor Analysis (FA), Partial Least Square Discriminant Analysis (PLS-DA) and Quadratic Di
Química Nova. Publicado em: 2009
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8. Preparation, characterization, and application of trimetalic catalysts for direct ethanol fuel cells: Pt-Ru-Sn/C / Preparação, caracterização e aplicação de catalisadores trimetálicos para a oxidação de etanol em célula a combustível direta: Pt-Ru-Sn/C
This work aimed at developing a method for the obtention of carbon-supported Pt nanocatalysts modified with Rhutenium and Tin, which were evaluated for ethanol eletrooxidation in direct fuel cells. To obtain these catalysts, we employed the Pechini method, which consists in the decomposition of a polymeric precursor. Many nanocatalysts containing various PtR
Publicado em: 2007
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9. Suplementation of nitrogen about the alcoholic fermentation for production of cachaça, beer and wine / Suplementação de nitrogênio sobre a fermentação alcoólica para produção de cachaça, cerveja e vinho
The alcoholic fermentation step is of major importance on the sensory and chemical composition of alcoholic beverages. The fermentation process is influenced by the yeast strain, by the presence of nitrogen compounds on the environment, by the temperature and other factors. The objective of this paper was to evaluate the influence of two different yeast stra
Publicado em: 2007
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10. "Electrochemical and spectroscopics studies of ethanol, acetaldehyde and acetic acid electrooxidation on Pt(110) modified by osmium" / "Estudos eletroquímicos e espectroscópicos da eletrooxidação de etanol, acetaldeído e ácido acético sobre Pt (110) modificada superficialmente por ósmio"
Este trabalho descreve estudos eletroquímicos e espectroscópicos da eletrooxidação de etanol, acetaldeído e ácido acético sobre uma superfície de platina monocristalina de baixo índice de Miller 110 modificada por ósmio (Os). O eletrodo monocristalino de Pt(110) foi modificado por Os espontaneamente e pela aplicação de potencial. Os eletrodos for
Publicado em: 2006
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11. Ethanol Electrooxidation with dimensionally stable anodes, DSA®, in NaCl medium / Eletrooxidação do etanol na presença de cloreto de sódio em eletrodos de óxidos de rutênio e irídio
In this work, it was investigated the electrocatalytic properties of oxides electrodes denominated dimensionally stable anodes, DSA®, in NaCl medium, applying them for ethanol oxidation. For this propose, many experimental parameters nave been investigated: the modulator oxide, changes in the preparation method of the electrode and pH changes of the solutio
Publicado em: 2005
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12. Oxidação de etanol a acetaldeido sobre catalisador de cobre oxidado
During its initial stage of development Brazil, Ethanolchemistry will certainly be developed along the traditional chemical routes, as the conventional acetic acid and derivatives from aceta1gehyde. This work involves the kinetic study of ethanol oxidation to acetaldehyde over an oxidized copper catalyst, whose results are used in the simulation of an indust
Publicado em: 1984