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 2000 | |||||||
Articol: |
MEDIATED ANODIC OXIDATION OF TOLUENE WITH THE CE(IV)/CE(III) SYSTEM IN SULPHURIC ACID MEDIUM. Autori: LIVIU ONICIU, CLAUDIA GEMMA MUREŞANU, CRISTINA G. BUCŞA. |
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Rezumat: The Ce(IV)/Ce(III) couple was used as a mediator to oxidize an emulsion of toluene in aqueous H2SO4 medium, on graphite electrode using a divided electrochemical cell. The only oxidation product that could be identified, was benzaldehyde. The influence of several parameters upon benzaldehyde formation was investigated. The best yield for benzaldehyde formation, under the conditions employed was about 36%. Cyclic voltammetry was used to study the Ce(IV)/Ce(III) couple. Diffusion coefficients, reaction orders with respect to Ce (IV) and Ce(III) as well as the rate constants for Ce(IV) reduction and Ce(III) oxidation were determined. Ce (IV) regeneration on graphite electrode in H2SO4 medium using a divided cell was investigated. Good yields over 80% were obtained working under best conditions we found. | |||||||