ELECTRICAL CONDUCTIVITY MEASUREMENTS OF MIXED OXIDE CATALYSTS USED AS A TYPICAL REACTION OF HEAVY WATER PRODUCTION |
| Author : EL-SHARKAWY AM |
| Abstract | Full Text |
Abstract :The alternative conductivity (AC) of nickel catalysts promoted with Fe2O3 and supported with Al2O3, CoO and MnO was examined using a conductivity bridge and applying the complex impedance method. The obtained semicircles permitted calculation of the electrical conductance for the examined samples. The results show that they have an electronic nature. The electrical properties of the catalysts depend on their structure and composition. Their resistance may be a combination of bulk crystal resistance and grain boundary one. The variation of conductivity with temperature for the examined catalytic systems shows an increase of resistance with decreasing temperature, indicating an activated conduction and semiconductor nature. |
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ELECTROOXIDATION AND DETERMINATION OF TRAMADOL IN THE PRESENCE OF DOPAMINE AT POLY 1,8-DIAMINONAPHTHALENE DERIVATIVE MODIFIED PLATINUM ELECTRODE |
| Author : ABLA AHMED HATHOOT*, MOHAMED ELSAYED FAHMY AND MAGDI ABDEL AZZEM |
| Abstract | Full Text |
Abstract :Modified platinum electrode based on the poly 8-(3-acetylimino-6-methyl-2,4-dioxopyran)-1-aminonaphthalene (PAMDAN) film was prepared by electrochemical polymerization technique. The modified electrode showed electrocatalytic activity toward tramadol (Tram) oxidation in acidic aqueous solution. It was demonstrated that Pt electrode modified by PAMDAN film (PAMDAN/Pt modified electrode) could be used for Tram detection using cyclic voltammetry (CV) and square wave voltammetry (SWV) techniques. This modified electrode was quite effective not only for detecting Tram, but also for simultaneous determination of Tram and dopamine (DA) in a mixture with satisfactory results. |
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