Studies on Indian Ocean Manganese Nodules: 9. Catalytic Oxidation of Thiols to Disulphides by Central Indian Ocean Ferromanganese Nodules
โ Scribed by K.M. Parida; A. Samal; N.N. Das
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 102 KB
- Volume
- 197
- Category
- Article
- ISSN
- 0021-9797
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โฆ Synopsis
extensively studied and the results are well documented in The oxidation of thiols to corresponding disulfides by Indian the literature ( 16). However, their oxidizing ability and cata-Ocean ferromanganese nodules has been studied under varying lytic activity for organic reactions have been sparsely studied experimental conditions. More than 90% conversion of thiols (2.5 (17,18). With these in view, the oxidation of thiols to 1 10 03 mol) was achieved at 35ะC using 0.1 g nodules. The oxides disulfides by different Indian Ocean manganese nodules has of Mn, Fe, Ca, Mg, and Al and surface oxygen in the nodules are been studied and the results are reported.
most likely responsible for the oxidation of thiols. Under identical conditions the oxidative conversion of thiols decreases in the order 1-dodecanethiol รต 1-hexanethiol รต 1,4-butanedithiol รต a-tolu-EXPERIMENTAL enethiol.
๐ SIMILAR VOLUMES
45 mm) were dried at 110ะC for 8 h and stored in a Adsorption of aqueous phosphate on Indian Ocean manganese desiccator over fused CaCl 2 for further use in characterizanodules was studied as a function of time, pH, and concentrations tion and adsorption studies. ## of adsorbate and adsorbent in ac
process of accumulation of heavy metal ions on the surface The adsorption behavior of M 2/ ions ( M ร Cu, Co, Ni, and of manganese nodules on the ocean bed we have studied the Pb ) onto manganese nodules has been investigated at 3.5 ยฃ pH adsorption of some bivalent metal cations [Cu(II), Ni(II), ยฃ 5
ร400ะC (8)(9)(10)(11). A number of attempts have been made to The promoting effect of Ag 2 O on the physicochemical properties modify the surface properties and catalytic activity of the and catalytic activity of manganese nodules has been investigated. nodules (10, 12, 13); for example, incorporati
In order to activate the naturally occurring material, sam-The effects of acetic acid treatment on the physicochemical ples 075/45 mm were treated with various concentrations properties and catalytic activity of manganese nodules have been (0.1 to 1 M) of acetic acid. About 10 g of the sample was st
The effects of alkali (sodium hydroxide) treatment on the physico-chemical properties and catalytic activity for H 2 O 2 decomposition and CO oxidation of Indian Ocean manganese nodules have been studied. The surface area, surface oxygen, surface hydroxyl groups, etc. increase with alkali treatment