Kinetics and mechanism of H2O2 decomposition by Cu(II)-, Co(II)-, and Fe(III)-Amine complexes on the surface of Silica-Alumina (25% Al2O3)
✍ Scribed by Mohamed A. Salem; Ibrahim A. Salem; Ali H. Gemeay
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 356 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
Abstract
The kinetics of the H~2~O~2~ decomposition by Cu(II)‐, Co(II)‐, and Fe(III)‐amine complexes supported on the surface of silica‐alumina (25% Al~2~O~3~) catalyst have been investigated. The decomposition process proceeded with first‐order kinetics for the substrate concentration. With copper complexes, in particular, the rate of reaction decreased in the sequence: ethylenediamine (en) > monoethanolamine (mea) > triethanolamine (tea). With ethylenediamine as aligand, the rate has also decreased in the order: Cu(II) > Co(II) > Fe(III). Both of the energy and entropy of activation were found to decrease as: en > mea > tea and for one ligand (en) and different metal ions the sequence was Cu(II) > Co(II) > Fe(III). The decomposition reaction involved the formation of an intermediate active species, which converts into a peroxo‐metal‐complex of brown or faint red color. The rate of reaction was directly proportional to the [complex], [H~2~O~2~], and [H]^−1^. A mechanism describing the decomposition process is proposed. © 1994 John Wiley & Sons, Inc.