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  • Author or Editor: Z. Omran x
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Abstract  

Gamma-irradiation effect on the kinetic parameters of the cation exchange reactions of Fe2+, Co2+ and Ni2+ ions on H-Mordenite has been studied. Kinetic analysis of the results according to the various theoretical models showed that the best fir of data is obtained of both non-irradiated and irradiated H-Mordenite with low doses from 2.2.106 to 4.6.106 Gy with three-dimensional diffusion controlled reaction (D3), while the best fit is obtained for the 2-dimensional diffusion controlled reactions (D2) by increasing the radiation dose to 5.5.106 Gy. These investigations have shown that the possible reason for such behavior have been analyzed on the basis of g-irradiation may be caused desorption of the adsorbed ionic species.

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Abstract  

The effect of gamma-radiation on the kinetic parameters of the cation exchange reactions of Co, Ni and Cu ions on Zeolites 13X has been studied. The radiation did not modify the mechanism of the exchange reactions, but it caused a change in the rate of exchange, which is dependent upon radiation dose. The effect of γ-irradiation on the electrical conductivity of zeolites has been also investigated and discussed.

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Abstract  

The physicochemical properties (crystal structure, surface acidity, surface area, catalytic activity and electrical conductivity) of TiO2-silica gel mixed oxides have been investigated. A series of mixed oxides of various compositions in the range of 0–100% for each component were prepared by calcining the mixed oxides in air at temperatures of 115, 300, 600 and 1000°C. The results obtained have been discussed and correlated.

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Abstract  

The electrical conductivity of pure and Mn-doped MgAl2O4 spinel has been studied in nitrogen atmosphere as a function of temperature. The conduction process is explained by the motion of cation vacancies in each of -irradiated and unirradiated samples. The effect of -irradiation on the conductivity and activation energy has been discussed.

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