Citric acid oxidation by vanadium(V) in sulfuric acid medium: Kinetic and mechanistic study

Citation
C. Raminelli et al., Citric acid oxidation by vanadium(V) in sulfuric acid medium: Kinetic and mechanistic study, INT J CH K, 32(9), 2000, pp. 566-572
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
ISSN journal
0538-8066 → ACNP
Volume
32
Issue
9
Year of publication
2000
Pages
566 - 572
Database
ISI
SICI code
0538-8066(200009)32:9<566:CAOBVI>2.0.ZU;2-9
Abstract
The citric acid oxidation by vanadium(V) in sulfuric acid medium at 303 K i s reported The reaction rate was determined spectrophotometrically by monit oring the formation of vanadium(IV) at 760 nm. The oxidation showed a First -order dependence with respect to vanadium(V) concentration and fractional order with respect to citric acid concentrations, with no control and with constant ionic strength. The reaction is also First order with respect to s ulfuric acid concentration with no control and of fractional order at const ant ionic strength. The reaction rate is enhanced by an increase of ionic s trength and increased by a decrease of the dielectric constant. The activat ion parameters were calculated based on the rate constants determined in th e 293 to 313 K interval. The proposed oxidation mechanisms and the derived rate laws are consistent with the experimental rate laws. (C) 2000 John Wil ey & Sons, Inc.