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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.1-2 din 2002 | |||||||
Articol: |
KINETICS AND MECHANISM OF P-XYLENE OXIDATION BY CE(IV) IN AQUEOUS ACIDIC MEDIUM. Autori: CLAUDIA GEMMA MUREŞANU, GABRIELA-CRISTINA BUCŞA, IOAN BÂLDEA. |
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Rezumat: The oxidation of p-xylene by Ce(IV) in aqueous acidic media has been followed spectrophotometrically in a reaction mixture containing HClO4 and NaClO4. The effects of p-xylene and hydrogen ion concentration on the reaction rate have been studied. The kinetic study revealed a two-stage process. The experimental rate law exhibits a first-order dependence on Ce(IV) concentration and a complex dependence on p-xylene and hydrogen ion concentrations. Apparent activation parameters were also calculated. A reaction mechanism involving the formation of an adduct between p-xylene and Ce(IV) in the first step was suggested. The adduct is the subject of an inner electron transfer, in the next step, in order to yield the products. | |||||||
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