Potentiality of Indian Ocean Manganese Nodule and its Leached Residue as Oxidation Catalyst and Adsorbent

摘要

The detailed physico-chemical characterization of manganese nodules (MN) and water washed manganese nodule leached residues (WMNLR) has been carried out on the basis of chemical analysis, XRD, TG/DTA, FT-IR, surface area and other surface properties. The surface area of MN samples dried at 110℃ ranges from 97 to 130 m~2/g. Surface area, surface oxygen, surface hydroxyl group and surface acid sites of MN and WMNLR increase up to 400℃ and then decrease with further rise in calcination temperatures up to 700℃. The catalytic activity of MN samples for CO oxidation and decomposition of VOCs such as acetone, methanol and 2-propanol has been performed in a static bed reactor. The catalytic activity of the calcined WMNLR samples was tested for single step oxidation of benzene to phenol, esterification of acetic acid with n-butanol and bromination of phenol. MN-400 and WMNLR-400 shows highest catalytic activity in the above mentioned reactions. MN and WMNLR are found to have good adsorption capacity for both cations and anions.