NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.47A [2008] >
IJC-A Vol.47A(08) [August 2008] >


Title: Kinetics and mechanism of iridium(III) catalyzed oxidation of ethylene glycol by cerium(IV) in sulfuric acid media
Authors: Bai, Wei-song
Zhai, Yong-qing
Liu, Hong-mei
Lü, Hong-ying
Song, Wen-yu
Issue Date: Aug-2008
Publisher: CSIR
IPC CodeInt. Cl. ⁸ C07B33/00
Abstract: The kinetics and mechanism of trace iridium(III) catalyzed oxidation of ethylene glycol by cerium(IV) in sulfuric acid media has been investigated by titrimetric technique of redox in the temperature range of 298-313K. The reaction is first order with respect to Ce(IV) and Ir(III), and a positive fractional order with respect to EG. It is found that the pseudo-first order ([EG]>>[Ce(IV)]>>[Ir(III)]) rate constant, kobs, decreases with the increase of [HSO₄⁻] and increases with the increase of [H⁺]. Under nitrogen atmosphere, the reaction system can initiate polymerization of acrylonitrile, indicating the generation of free radicals. On the basis of the experimental results, a reasonable mechanism has been proposed. Rate equations derived from this mechanism can explain all the experimental results. From the dependence of kobs on the concentration of HSO₄⁻, the kinetically active species has been found to be Ce(SO₄)₂. The rate constants of the rate determining step and the activation parameters have been evaluated.
Page(s): 1194-1198
ISSN: 0376-4710
Source:IJC-A Vol.47A(08) [August 2008]

Files in This Item:

File Description SizeFormat
IJCA 47A(8) 1194-1198.pdf151.27 kBAdobe PDFView/Open
 Current Page Visits: 740 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 622484 since 06-Feb-2009  Last updated on 13-Nov-2014Webmaster: nopr@niscair.res.in