Publications Scientifiques

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Author: search.filters.author.Boualouache, Adel

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    Recovery of transient medium-grade heat in temperature swing adsorption natural gas dehydration processes
    (Elsevier, 2022) Boualouache, Adel; Akrour, Soumia; Amokrane, Samira
    Temperature swing adsorption (TSA) is a mature technology for various liquids and gases processing, notably used for natural gas dehydration. During the operation of TSA dehydration systems, considerable amount of transient medium-grade heat is generated, and it is often dissipated to the atmosphere. This study intends to enhance the thermal performance of TSA processes by recovering the discontinued medium-grade heat through an organic Rankine cycle (ORC). TSA steps were adjusted, optimized, ORC equipment were selected and sized to meet the Oil & Gas industry standards. Zeotropic mixtures were used as working fluids. Results indicate that rich propane liquefied petroleum gas exhibits better performance, compared to rich butane liquefied petroleum gas. Operating its turboexpander under optimized conditions could generate 1.2 MW of power and could ensure an efficiency of 26%. Three shell and tube heat exchangers having a total surface of 145 m2, connected in series was found to be the best configuration of its evaporation section. Besides, machinery average cost represents 61% of ORC equipment cost. While, the evaporator constitutes only 14%. Key economic factors predict a rate of return that reaches 35% and a pay-out period of 5.5 years at electricity price equals to 0.100 $/kWh
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    Mechanistic details of methane dry reforming on copper-nickel bimetallic surfaces
    (Elsevier, 2020) Boualouache, Adel; Boucenna, Ali
    Using spin polarized DFT, we performed mechanistic studies of methane dry reforming on Cu-Ni bimetallic surfaces. We computed the local density of states (LDOS) of intermediates/surfaces to analyse chemical bonding on different Cu-Ni alloys. Our results show that carbon resistance of low Cu amount surfaces is related to a reduced interaction of CH 1π orbital with 3d states. Likewise, the lowering of (1π, 2π* −3d) binding intensity, catalyses CO desorption rather than its retention and/or activation, enhancing CO anti-poisoning.
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    Interaction of intermediates with transition metal surfaces in the dehydrogenation of ethanol to ethyl acetate: A theoretical investigation
    (SAGE Publications, 2019) Boualouache, Adel; Boucenna, Ali; Otmanine, Ghazi
    By employing a combined approach of the unity bond index–quadratic exponential potential method and density functional theory within the generalized gradient approximation, we have studied the interaction of intermediates in the ethanol dehydrogenation process to ethyl acetate on Cu, Ag, Ni, Pd, Pt, Co, Au and Ir(111) transition metal surfaces. Binding energies and geometries were optimized for the main intermediates of this process. Electronic structures were computed for some intermediates/transition metal systems. We also calculated the activation energies for the elementary steps of the reactions. The results show that amid the studied surfaces, Cu(111) stabilizes ethoxy and acetyl species, preventing their dissociation. Inducing the h2 binding mode of acetaldehyde by alloying Cu with Ni, Co, Pd, Pt or Ir can enhance the catalytic proprieties of the Cu(111) clean surface.
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