Papers by Salvatore Luiso
Journal of The Electrochemical Society, 2017
Solution of transport problems using Fluent software
A mixture of Benzene – Toluene with z Benz = 0.45 is fed to a distillation column with flow rate ... more A mixture of Benzene – Toluene with z Benz = 0.45 is fed to a distillation column with flow rate equal to 25000 kg/h (291.72 kmol/h) and inlet temperature T = 40° C. The distillation column, operating at P = 1 atm, is used to obtain two liquid streams with top benzene composition x D = 0.995 and bottom benzene composition x W = 0.002 (for every calculus see calculus sheet annex). 1. We start doing an overall mass balance to find the flow rate and the composition of the outlet products:
A stream with 20000 kg/h of a mixture of Benzene and Butane at 50 % mol has to be completely cond... more A stream with 20000 kg/h of a mixture of Benzene and Butane at 50 % mol has to be completely condensed. Water from a cooling tower is available for the operation (for every calculus see calculus sheet annex). An assessment of fluids, temperatures, pressure, corrosion, fouling and other relevant features to heat exchangers design leads to the determination of the condenser configuration. A horizontal TEMA'E'-shell and tube condenser was chosen for this case. The main advantages of this geometry include the suitability for most industrial process cooling application, the counter-flow fluid circulation and the lowest cost; its disadvantages are higher head loss (i.g. with respect to TEMA " J " , split flow configuration), possible temperature " pinch " , difficulties in extraction of non-condensable gases. 1. Since the mixture is condensing and the water is just heating up, we put the condensing mixture in the shell side and the water in the tube side. We want to determine the pressure and the temperature of the condensate outlet. In order to do this, we assume that the condensation is isobaric: at the end of the procedure we will verify that the pressure drops shell side are a negligible percentage of the total pressure (<7%), so that our assumption is justified. By the way, in every design we will analyze, we will always allow pressure drops less than 10% of the total pressure. Since we are dealing with a mixture of hydrocarbons we can assume that the activity coefficients of both Butane and Benzene are 1. Then, we apply Raoult's law for ideal mixtures (from now on subscript 1 is for Butane and subscript 2 is for Benzene):
Final thesis for undergraduate degree in Chemical Engineering at university of Bologna under the ... more Final thesis for undergraduate degree in Chemical Engineering at university of Bologna under the direction of Prof. Stramigioli.
Final term paper for Chemical Reactor Engineering class
Final term paper for Thermodynamic class
Final report on electrochemistry class
Final report on research done at University of Bologna under the direction of Prof. Camera Roda.
The challenge to replace fossil fuel with clean and renewable energies has led the scientific com... more The challenge to replace fossil fuel with clean and renewable energies has led the scientific community to research alternative sources of energy. Because of the low-environmental impact and high-specific energy of hydrogen, interest in sustainable ways of producing it has increased. Water electrolysis is the best method to generate high-purity hydrogen without pollutants, but it is an energy-intensive route. The existing platinum (Pt) catalysts are highly efficient, but the cost and rarity of Pt limits its use. Therefore, seeking high-efficient and cost-effective catalyst for mass production of hydrogen is critical to the utilization of hydrogen energy. In 2005, Nørskov et al. reported that molybdenum disulfide (MoS2) showed good activity for hydrogen evolution reaction (HER). The work in this thesis aims to develop high-efficient molybdenum sulfide catalysts. Molybdenum trisulfide (MoS3) was synthesized from acidification of ammonium tetrathiomolybdate [(NH4)2MoS4] with the addition of sodium sulfide (Na2S • 9H2O) to the reaction mixture. The synthesis parameters such as carbon support, S:Mo atomic ratio, solvent (H2O, ethylene glycol (EG)), dopants (Co/Fe) and pH were systematically studied. The physical and chemical properties of the prepared catalysts were characterized by microscopy (SEM, TEM), x-ray spectroscopy (XPS), and elemental analysis and mapping (ICP, CHNS, STEM). The electrochemical activity toward HER was studied using voltammetry and impedance tests. In the first section of the study, MoS3 nanoparticles were synthesized on three carbon supports (graphene nanoplatelets (GNP), Ketjenblack EJ-300 and Vulcan XC 72R) with
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Papers by Salvatore Luiso