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Oxidation of malic acid by vanadium (V) in sulphuric acid medium: A kinetic and mechanistic investigation

✍ Scribed by Cláudio Marcos Ziglio; Keiko Takashima

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
522 KB
Volume
27
Category
Article
ISSN
0538-8066

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✦ Synopsis

The oxidation kinetics of malic acid by vanadium(V) in aqueous sulphuric acid was investigated at 303 K by monitoring the appearance of vanadium(1V) at 760 nm. The reaction showed first-order behavior with respect to vanadium(V), malic acid, and hydrogen ion concentration, respectively, regardless of the ionic strength. The reaction rate is enhanced by an increase in ionic strength and a decrease of the dielectric constant of the medium by addition of methanol. The activation parameters were estimated by varying the temperature in the range of 293 K to 313 K. An oxidation mechanism is proposed, involving different vanadium(V) species produced in the presence of sulphuric acid.

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