Catalyzed Decomposition
Mostrando 1-12 de 36 artigos, teses e dissertações.
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1. Fast Screening of Solvents for Simultaneous Extraction of Furfural, 5-Hydroxymethylfurfural and Levulinic Acid from Aqueous Solution Using SMD Solvation Free Energies
Acid catalyzed decomposition of C5 and C6 sugars has been considered an important source of biomass derived chemicals. An essential step in this process is the extraction of furfural, hydroxymethylfurfural and levulinic acid from aqueous phase. In this work, a computational screening of 178 organic solvents for simultaneous extraction of these chemicals from
J. Braz. Chem. Soc.. Publicado em: 2018-02
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2. AuNP@TiO2 Catalyzed Peroxidation of Ethyl- and n-Propylbenzene: Exploring the Interaction Between Radical Species and the Nanoparticle Surface
Ethyl- and n- propylbenzene peroxidation has been studied in the presence of supported gold nanoparticles on TiO2(AuNP@TiO2). The decomposition products obtained from Fenton-induced cumene hydroperoxide decomposition, as well as the oxidation products of ethyl- and n- propylbenzene, implicate the participation of reactive oxygen species adsorbed on the AuNP
J. Braz. Chem. Soc.. Publicado em: 2016-02
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3. Kinetic Parameters of Soot Oxidation Catalyzed by Nanosized ZnO-CeO2 Solids
Catalytic combustion of soot was performed over ZnO:CeO2 catalysts obtained via a non‑alkoxide sol-gel route. Different kinetics parameters were calculated through thermal analyses, thus, enabling the correlation between the experimental data and the decomposition mechanisms probably associated with the soot decomposition in each case.
J. Braz. Chem. Soc.. Publicado em: 2015-07
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4. Effects of oral administration of S-nitrosothiols and knectic evaluation of the kinetic propensity and resistance to diet induced obessity / Efeitos da administração orogástrica de s-nitrosotióis e avaliação cinética da propensão e resistência à obsidade induzida por dieta
In the present study, the nitric oxide (NO)-associated physiological actions obtained topically on the gastric mucosa and systemically in oral administrations of two NO donors-S-nitrosothiols (RSNOs), S-nitrosoglutathione (GSNO) and S-nitroso-N-acetylcysteine (SNAC) were investigated in animal models. The topical ex vivo administration of RSNOs solutions on
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/2011
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5. Luz: um raro produto de reação
The production of visible light by chemical reactions constitutes interesting and fascinating phenomena and several reaction mechanisms are discussed to rationalize excited state formation. Most efficient chemiluminescence reactions are thought to involve one or more electron transfer steps and chemiexcitation is believed to occur by radical annihilation. A
Química Nova. Publicado em: 2011
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6. Estudio cinético de la descomposición catalizada de peróxido de hidrógeno sobre carbón activado
The kinetic study of decomposition of hydrogen peroxide catalyzed by activated carbon was carried out. The effect of concentrations of reactants and temperature were experimentally studied. Kinetic data were evaluated using differential method of initial rates of reaction. When a typical kinetic law for reactions in homogeneous phase is used, first order of
Química Nova. Publicado em: 2009
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7. Modificações da Celulose Kraft Branqueada de Eucalipto por Tratamento Térmico e de Radiação Ultravioleta
Cellulose is used like raw material on many products, it may be found in native form (cellulose I) or on its modified forms (cellulose II, III1, III2, IV1, and IV2). Cellulose is obtained by many processes and raw materials being, alkaline pulping of woods (hardwood/softwood) is most frequent. In time function cellulose products are modified since hydrolysis
Publicado em: 2009
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8. The iodide-catalyzed decomposition of hydrogen peroxide: mechanistic details of an old reaction as revealed by electrospray ionization mass spectrometry monitoring
A espectrometria de massas com ionização electrospray no modo negativo, ESI(-)-MS, foi usada para investigar a decomposição da água oxigenada catalisada por iodeto em meio aquoso. O monitoramento por ESI(-)-MS revelou a presença de um ânion intenso de m/z 287, o qual foi sugerido possuir a estrutura [I-IOOH]- em solução aquosa, através de uma inter
Journal of the Brazilian Chemical Society. Publicado em: 2008
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9. Estudo dos mecanismos de quimi-excitação na decomposição induzida de peróxidos: uma comparação entre sistemas inter e intramoleculares / Studies on the chemiexcitation mechanisms in induced peroxide decomposition: a comparison of inter and intramolecular systems
Foram sintetizados, purificados e caracterizados os peróxidos cíclicos: peróxido de difenoíla (1), dimetil-1,2-dioxetanona (2), e spiro-adamantil α-peróxi lactona (3), e determinados seus parâmetros de quimiluminescência. Foram redeterminados os rendimentos quânticos singlete na decomposição catalisada de 1 e 2 em condições análogas as util
Publicado em: 2007
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10. Mechanistic study od atrazine herbicide oxidation in the presence of minerals znd humic substances in anaerobic environmen. / Estudo do mecanismo de oxidação do herbicida atrazina na presença de minerais e sustâncias húmicas em ambiente anaeróbio.
The oxidative decomposition of atrazine was induced by hydroxyl radicals generated from the interaction between hydrogen peroxide, H2O2, and iron oxides, yielding the Fenton reaction. The reaction rate of atrazine oxidation was followed in the presence of iron minerals: goethite, ferrihydrite, and lepidocrocite; and further with humic acid (HA) extracted fro
Publicado em: 2005
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11. Novos materiais à base de nanofibras de carbono como suporte de catalisador na decomposição da hidrazina
Today satellites propulsion is based on the use of monopropellant and/or bipropellant chemical systems. The maneuvering of satellite is based on the hydrazine decomposition micropropulsors catalyzed by metallic iridium supported on g-alumina. This reaction is a surface reaction and is strongly exothermic and implies that the operation of the micropropulsor i
Química Nova. Publicado em: 2003-10
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12. Quimiluminescência de peróxidos orgânicos: geração de estados eletronicamente excitados na decomposição de 1,2-dioxetanos
In this review article, we give a general introduction on the mechanisms involved in organic chemiluminescence, where three basic models for excited state formation are presented. The chemiluminescence properties of 1,2-dioxetanes - four membered ring peroxides - are briefly outlined in the second part. In the main part, the mechanisms involved in the decomp
Química Nova. Publicado em: 2001-10