Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1251308 | Chemical Research in Chinese Universities | 2007 | 6 Pages |
Abstract
In this study, the kinetics and mechanism of the iridium (III)-catalyzed oxidation of ethanol amine (EAN) by cerium (IV) in a sulfuric acid medium was investigated using titrimetric technique of redox in a temperature range of 298-313 K. It was found that the reaction is of first order with respect to Ce(IV) and Ir(III), and a positive fractional order with respect to EAN. It was also found that the pseudo-first-order ([EAN]>> [Ce(IV)]) rate constant kobs decreases with the increase of [H+] and [HSOâ4]. Under the protection of nitrogen gas, the reaction system can initiate the polymerization of acrylonitrile, indicating the generation of free radicals. On the basis of the experimental results, a suitable mechanism was proposed. From the dependence of kobs On the concentration of hydrogen sulfate, Ce(SO4)2 was found to be the kinetically active species. The rate constants of the rate-determining step together with the activation parameters were evaluated.
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Physical Sciences and Engineering
Chemistry
Chemistry (General)
Authors
ZHAI Yong-qing, LIU Hong-mei, YANG Lin, YANG Guo-zhong, SONG Wen-yu, LIU Yu-kai,