Reduction of Thiocyanate Complexes of Fe(III) in the Presence of Activated Carbon

Fe (III) complexed with SCN- was found to be reduced to Fe(II) in the presence of activated carbon. The rate of disappearance of the complex was determined spectro photometrically and was found to be first order with respect to Fe(I1I). The enthalpy and entropy of activation are 100 ± 10 kJ/mole and 14.1 ± 0.8 J/mole-K respectively. Some Fe was found to be adsorbed on the catalyst where the actual reduction was suggested to take place. The accompanying oxidation reaction has been suggested to be mainly that of the thiocyanate ions adsorbed at the positive centres on the catalyst

High-energy Modification Hydrates of Copper(II) Sulphate: heats of solution and infrared spectrum

High-energy modification of lower hydrates of copper(II) sulphate have been prepared and their heats of solution measured. The values obtained are higher than previously found for the salt. A new mechanism of dehydration has been proposed and supported by ir study of deuterated sample

Potential Measurements on Rubber Surfaces in Electrolyte Solutions

Films of natural and modified rubber were prepared and used as electrode membranes. The potential developed varied with the concentration of ions in solution and is discussed in terms of adsorption of the ions onto the membrane

Off-design correlation for losses due to part-span dampers on transonic rotors

Experimental data from 10 transonic fan rotors were used to correlate losses created by part-span dampers located near the midchord position on the rotor blades. The design tip speed of these rotors varied from 419 to 425 m/sec, and the design pressure ratio varied from 1.6 to 2.0. Additional loss caused by the dampers for operating conditions between 50 and 100 percent of design speed were correlated with relevant aerodynamic and geometric parameters. The resulting correlation predicts the variation of total-pressure-loss coefficient in the damper region to a good approximation

Conductance of Water-sorbed Activated Carbon: Differentiation of Flow Direction

The conductance of a piece of activated carbon immersed in water has been measured at several different temperatures. The upward and downward flow Qf water as well as the flow in the horizontal direction in the same piece was made possible by using various arrangements of the apparatus. The rate of increase in the conductance has been interpreted as the rate of flow of water into the pores of activated carbon

Conductance Measurement of Water-sorbed Activated Carbon

The conductance of a piece of I1ctivated carbon has been measured while immersed under water at five different temperatures. The change in conductance with time has been attributed to the ionization of the functional groups on the walls of the pores as the latter were gradually filled. The average pore radius has been estimated by using the equations derived to relate the increase in the conductance to the rate of flow of water into the pores

Changes in Surface Potential of Activated Carbon Due to Adsorption of Ions

The construction of a carbon electrode and the measurement of the changes in the potential that developed on its surface as a result of adsorption of ions are discussed as a function of the cation adsorption and ionization of the functional groups on the surface of carbon

Thermal studies on chromium(II) salts: part 2

The thermal behavior of Cr(pn)3Br2·2H2O, Cr(pn)3Cl2·2H2O, Cr(pn)3SO4, Cr(dien)2Br2, Cr(dien)2Cl2, Cr(dien)Cl2 and Cr(dien)Br2 was investigated using TG and DSC under nitrogen atmosphere. The thermograms are interpreted and the enthalpies of dissociation are calculated where possible