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Effect of surfactant micelles on the kinetics of oxidation of D-fructose by cerium(IV) in sulfuric acid medium

โœ Scribed by Kabir-ud-Din; Mohd. Sajid Ali; Zaheer Khan

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
155 KB
Volume
38
Category
Article
ISSN
0538-8066

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โœฆ Synopsis

Abstract

Kinetics of the oxidation of Dโ€fructose by cerium(IV) has been investigated both in the absence and presence of surfactants (cetyltrimethylammonium bromide, CTAB, and sodium dodecyl sulfate, SDS) in sulfuric acid medium. The reaction exhibits firstโ€order kinetics each in [cerium(IV)] and
[Dโ€fructose] and inverse first order in [H~2~SO~4~]. The Arrhenius equation is found to be valid for the reaction between 30โ€“50ยฐC. A detailed mechanism with the associated reaction kinetics is presented and discussed. While SDS has no effect, CTAB increases the reaction rate with the same kinetic behavior in its presence. The catalytic role of CTAB micelles is discussed in terms of the pseudophase model proposed by Menger and Portnoy. The association constant K~s~ that equals to 286 mol^โˆ’1^ dm^3^ is found for the association of cerium(IV) with the positive head group of CTAB micelles. The effect of inorganic electrolytes (Na~2~SO~4~, NaNO~3~, NaCl) has also been studied and discussed. ยฉ 2005 Wiley Periodicals, Inc. Int J Chem Kinet 38: 18โ€“25, 2006

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