NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(05) [May 2011] >


Title: Mechanistic studies of aquachlororhodium(III) catalysis in potassium iodate oxidation of 1,2-propanediol in acidic medium: A kinetic approach
Authors: Singh, Bharat
Singh, Aniruddh Kumar
Singh, Anamika
Keywords: Kinetics
Reaction mechanisms
Oxidation
Rhodium
Propanediol
Issue Date: May-2011
Publisher: NISCAIR-CSIR, India
Abstract: The kinetics of homogeneously Rh(III) catalysed oxidation of 1, 2-propanediol by acidic solution of potassium iodate at constant ionic strength of the medium has been investigated at 308 K. The reaction follows complex kinetics, being first order in [KIO3], zero order in 1, 2-propanediol and inverse fractional order in both [H+] and [Cl¯]. The first order rate constant increases linearly with increase in [Rh(III)] in its lower concentration range but as the concentration of Rh(III) is increased towards the higher range, the rate constant becomes almost constant, indicating positive fractional order in [Rh(III)]. Variation of ionic strength of the medium and successive addition of mercuric acetate (used as I¯ ions scavenger) has a positive effect on the rate of the reaction. IO3¯ and [RhCl5(H2O)]-2 have been postulated as the reactive species of KIO3 and Rh(III), respectively. Activation parameters for the slow and rate determining step of the proposed mechanism, which involves the formation of the most activated complex, [Cl5Rh(HO→Hg)]¯, prior to the slowest step, have been obtained from rate measurements at 30, 35, 40 and 45 °C. The rate law conforming to the observed kinetic results has been derived as . The main oxidation products have been identified as acetic acid and formic acid
Page(s): 650-657
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.50A(05) [May 2011]

Files in This Item:

File Description SizeFormat
IJCA 50A(5) 650-657.pdf331.23 kBAdobe PDFView/Open
 Current Page Visits: 713 
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: 555262 since 06-Feb-2009  Last updated on 15-Jul-2014Webmaster: nopr@niscair.res.in