Catalysis Alkali
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Síntese e caracterização de biodiesel metílico e etílico a partir de blendas dos óleos de tungue e de soja / Synthesis and characterization of methyl and ethyl biodiesel from blends of tung oil and soybean
No presente trabalho foi investigada a transesterificação de blendas dos óleos de soja e de tungue com metanol ou etanol empregando catalisador alcalino (NaOH ou KOH). Foi investigado o tempo reacional, a proporção da blenda, a concentração e o tipo de catalisador, tipo de álcool e razão molar, temperatura e metodologia empregada no tratamento da re
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2011
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2. Produção de monoéster via etanólise por hidrotalcitas termoativadas : síntese e caracterização
Among biofuels of the 1st generation, biodiesel stands out for its equivalent features to those of mineral diesel, however less polluting. It can be obtained by transesterification of triglyceride fats or vegetable oils by (m)ethanolysis. Aiming at improving the chemical process, different types of catalysis have been studied: i) homogeneous (acid e.g. H2SO4
Publicado em: 2011
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3. BIODIESEL A PARTIR DE ÓLEOS DE ALTA ACIDEZ: Desenvolvimento de um processo catalítico homogêneo
The present work aims at developing a process for the production of biodiesel from oils of high acidity, using a process in two steps in homogeneous catalysis. The first is the reaction of ethyl esterification of free fatty acid, catalyzed by H2SO4, occurring on triglycerides and the second is the transesterification of residual triglycerides, from the first
Publicado em: 2009
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4. Study of catalytics Pt-In/Nb2O5 in the hydrocarbons conversion / Estudo de catalisadores Pt-In/Nb2O5 na conversão de hidrocarbonetos
Hydrocarbon dehydrogenation is an important industrial process, due to the high demand of unsatured hydrocarbons for industrial processes and products. Unsatured hydrocarbons are used in the manufacture of several products, such as detergents, high octanage gasoline, pharmaceutical products and synthetic rubber. The commercial catalysts employed in the hydro
Publicado em: 2003
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5. Biochemical evolution II: Origin of life in tubular microstructures on weathered feldspar surfaces
Mineral surfaces were important during the emergence of life on Earth because the assembly of the necessary complex biomolecules by random collisions in dilute aqueous solutions is implausible. Most silicate mineral surfaces are hydrophilic and organophobic and unsuitable for catalytic reactions, but some silica-rich surfaces of partly dealuminated feldspars
The National Academy of Sciences.