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    Reactor modeling of direct conversion of methane to methanol in a catalytic fluidized bed reactor

    , Article CHISA 2006 - 17th International Congress of Chemical and Process Engineering, Prague, 27 August 2006 through 31 August 2006 ; 2006 ; 8086059456 (ISBN); 9788086059457 (ISBN) Vafajoo, L ; Ghods, M ; Kazemeini, M ; Sharif University of Technology
    Direct conversion of methane to methanol is a more recently developed technique by which the intermediate and expensive process of formation of synthesis gas is eliminated. On the other hand, fluidized-bed technology for heterogeneous reversible reactions posses a couple of key advantages in comparison to the commonly used fixed bed reactors. These include, pore diffusion resistances being largely eliminated due to small catalyst pellet sizes utilized. In other words, industrial fixed bed pellets are in the order of 6-12 mm diameter, whereas fluidized catalyst used may be smaller than 100 μm. In addition, equilibrium limitations induced by the reversibility of the reaction(s) are broken in... 

    Ethanol spray combustion under a MILD condition: a chemical kinetic study

    , Article Energy and Fuels ; Volume 33, Issue 11 , 2019 , Pages 11861-11886 ; 08870624 (ISSN) Karimi Motaalegh Mahalegi, H ; Mardani, A ; Sharif University of Technology
    American Chemical Society  2019
    Moderate or intense low-oxygen dilution (MILD) combustion of liquid fuels has attracted attention because of its advantages in industrial burners and gas turbine applications. Here, numerical investigation has been conducted on an experimental MILD turbulent spray burner. The H∥ flame of Delft spray in a hot co-flow burner is selected, and the Reynolds averaged Navier-Stokes/eddy dissipation concept framework with 40 species/180 reversible reactions through a skeletal chemical mechanism is used in addition to unsteady Lagrangian tracking of spray droplets to investigate the flame structure and chemical kinetic of reacting flow field. At first, current numerical results were compared with... 

    Development of an electrochemical sensor based on (rGO-CNT) nanocomposite for raloxifene analysis

    , Article Materials Chemistry and Physics ; Volume 263 , 2021 ; 02540584 (ISSN) Ghalkhani, M ; Shahrokhian, S ; Navabi, M ; Sharif University of Technology
    Elsevier Ltd  2021
    A novel modified electrode is reported for the electrochemical investigation of the oxidation mechanism and also voltammetric determination of raloxifene (RLX). The surface of the electrode was modified with a thin layer of reduced graphene oxide-carbon nanotube nano-composite (rGO-CNT) was prepared, and successfully employed for the electrochemical studies of RLX. The morphology of the sensor surface was characterized by using a scanning electron microscopy. RLX Oxidation response significantly increased at the GCE covered with rGO-CNT, regarding the bare and CNT or rGO functionalized GCE. Experimental parameters affecting the RLX response were optimized and mechanism of the RLX oxidation...