Studies on Indian Ocean Manganese Nodules

Transition Metal Promoted Amorphous AlPO4Catalysts 1. Acid–Base and Textural Properties

“…A number of attempts have been made made up to 100 ml in a volumetric flask. The Al and to increase its acid sites by surface impregnating with transition metal content in an aliquot was determined by different anions or cations ( 13 -16 ) Surface acidity and basicity were determined by the spectrophotometric method ( 15,20 ) on the basis of irresemiautomatic X-ray diffractometer with autodivergent slit and graphite monochromator using Cu Ka radiation versible adsorption of organic bases such as pyridine ( PY, p K a Å 5.3 ) ; morpholine ( MP, p K a Å 8.33 ) ; Piperidine with a scanning speed of 2Њ min 01 . The instrument was operated at 40 kV and 20 mA.…”

Synthesis, characterization and catalytic activity of neat and alumina supported trans-(diaqua)(N,N-ethylene-bis-salicylamide)chromium(III): a comparative study

“…In fact, the Cr(OH 2 ) 6 3? exhibit three bands at 574.7, 405, and 270 [23]. Accordingly, the bands at 590 and 375 nm are assigned to 4 …”

“…The catalytic activities of Cr III (Salm) and Cr III (Salm)/alumina for H 2 O 2 decomposition were studied at 25°C under atmospheric pressure using the conventional gasometric method [23] by measuring the volume of oxygen liberated (V t ) at different time intervals. A certain amount of catalyst was dispersed in 50 ml of H 2 O 2 solution at the desired concentration in a reaction vessel and continuously stirred at constant speed using a magnetic stirrer.…”

Studies on Idian ocean manganese nodules, VII. Effect of γ-irradiation on the physico-chemical properties and catalytic activity of polymetallic nodules

“…The preparation of samples collected from different locations of Indian Ocean Basin was reported previously [8].…”

“…(as minor components) [8]. The metal ions present in variable oxidation states can undergo further variation on irradiation.…”