Adsorption kinetics of n-propanol on platinized platinum electrode in sulphuric acid solution

the adsorption kinetics of n-propanol on platinized platinum electrode in sulphuric acid solution is studied. Data on the influence of adsorption potential and of temperature are given. Values for the velocity constants and for activation energies are evaluated from the experimental data. © 1989.

Electrochemical behaviour of (N-R-4-cyanopyridinium)pentaammineruthenium(II) derivatives in acidic medium. Hydrolysis of coordinated nitriles

The electrochemical behaviour of N-R-4-cyanopyridinium (4-rcp) (R = methyl, decyl, dodecyl, or benzyl) coordinated to pentaammineruthenium(II) in CF3COOH-CF3COONa (μ = 0.1 M, pH 3) aqueous medium was studied by means of cyclic voltammetry and constant potential electrolysis. The electrochemical oxidation of the metallic centre (Ep ca 0.51 V/SCE) can be described as a reversible monoelectronic charge-transfer followed by an irreversible chemical reaction, which is the hydrolysis of N-R-4-cyanopyridiniumpentaammineruthenium(III) (A) to N-R-4-carboxamidepyridiniumruthenium (III) (B) with the kf1 values depending on the type of alkyl group. The E 1 2 values are not significantly influenced by the nature of the alkyl group. At more negative potential (ca -0.5 V/SCE), B undergoes an electrochemical reduction followed by an aquation reaction to produce aquopentaammineruthenium(II) and free N-R-4-carboxamidepyridinium. The amide was identified by comparison of its cyclic voltammogram and UV-vis spectrum with that of a sample prepared by chemical reaction. The results were also discussed by comparison with other systems, and show that nitrile-amide conversion catalysed by pentaammineruthenium(II) complexes is possible. © 1994.

Characterization of the phosphatidylinositol-specific phospholipase C-released form of rat osseous plate alkaline phosphatase and its possible significance on endochondral ossification

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Photoelectrocatalytic/photoelectro-Fenton coupling system using a nanostructured photoanode for the oxidation of a textile dye: kinetics study and oxidation pathway

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Polymerization kinetics and polymerization stress in resin composites after accelerated aging as a function of the expiration date

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Stability study and degradation kinetics of ceftazidime in pharmaceutical preparations

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Purificação parcial e caracterização bioquímica de uma isoforma de β-glicosidase do fungo termofílico Myceliophthora thermophila M.7.7

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização de segurança e tecnológica de bactérias acidoláticas termofílicas autóctones e aplicação em queijo parmesão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)