فهرست مطالب محمدرضا طوسی

Catalytic processes in oil and gas industries are very important for refining, purification and production of useful compounds. Regeneration of spent catalysts is interested due to their environmental problems as solid wastes in the refineries. Activated alumina is a very useful catalyst in gas refinery for conversion of hydrogen sulfide to the elemental sulfur in Claus unit.In this paper regeneration of spent catalyst of Claus process in Sulfur Recovery Unit (SRU) and application of it for synthesis of polypyrrole/Al2O3 composite as an adsorbent of lead ion was investigated.

Catalyst regeneration was performed via washing by water or caustic washing and then thermal process. Characterization and analysis of catalysts were performed by XRF, XRD, FTIR, and BET measurements. Polypyrrole /Al2O3 composite was synthesized by in situ polymerization and used for removal of lead ions in batch experiments and different values of pH, lead concentration and temperature.

Results showed that regeneration process caused to removal of impurities and sulfur without any change in the catalyst structure. Specific area of catalyst increased from 84 m2/g in spent catalyst to 186 m2/g in regenerated sample while the sulfur content decreased from 2.53% to 0.005-0.007%.

The results indicated that the composite showed high ability for lead removal. Adsorption behavior was determined as Langmuir isotherm and pseudo-second order kinetic.

Many countries have paid attention to the electric vehicles during the past decade. This kind of vehicle is equipped with an energy-saving system which is usually composed of a set of batteries. This system also suffers from several problems including excessive warming, low energy-saving capacity and low efficiency; hence, development of electric vehicles has been influenced by costs caused by such problems. A possible and proper way to solve some of these problems and to improve function of the energy- saving system is installing a supercapacitor as an accessory energy reservoir. Aiming at reducing both size and wastes of energy-saving system and also integrating the system's output current, this paper has not only used a three port bidirectional converter, as an interface among battery, supercapacitor and electric motor, but also has considered the way by which power of both reservoirs (i.e. battery and supercapacitor) are controlled directly though turning this convertor on. It has been implemented through two controlling layers including a fuzzy controller and an adjusting block. To analyze the result, an electric vehicle equipped with the suggested saving- energy system, as a sample, was manufactured by the authors and then the practical results were studied. Moreover, the suggested energy-saving system, in comparison to the common energy-saving systems, was modeled in MATLAB/SIMULINK. Modeling and practical results demonstrate that the efficiency of the suggested strategy is higher than that in other strategies.