چكيده به لاتين
In the present study, desulfurization of thiophene and benzothiophene by method of electrochemical reduction in divided reactor on Pt/C catalyst was investigated. Firstly, reduction of thiophene/benzothiophene in sulfuric acid electrolyte was investigated. In order to determining optimal reduction potential at Pt/C electrode, first a constant potential (-0.2, -0.1 and 0 volt) was applied to the electrolyte solution containing thiophene/benzothiophene and then from the electrolyte solution, a voltammogram was taken by Pt electrode. After investigation the result voltammogram, the potential of -0.1 volt was selected as the optimum reduction potential of thiophene and benzothiophene. To study the effect of membrane on Desulfurization process, two commercial membrane nafion 117 and synthesis membrane SPEEK was used. SPEEK membrane was prepared by the degree of sulfonation 65.05 percent, IEC 1.9 meq/g and proton conductivity 75 mS/cm. Carbon paper with Pt/C catalyst loading 1mg/cm2 was used in preparation of MEA. Membrane reactor made of plexiglass with a volume of 24 ml for each compartment with dense graphite electrode was designed. The membrane surface in contact with the electrolyte was 4cm2(2×2cm). In the next step, desulfurization of both model fuels that the first model fuel contains 386ppm of thiophene and the second one contains 366ppm of benzothiophene in a membrane reactor was performed. The results shows the elimination of 41.47% of Thiophene using Nafion and 76.3% using SPEEK as well as elimination of 20.33% of Benzothiophene using Nafion and 25.18% using SPEEK.
