Preparation, Characterization and, Activity of CoMo supported on Graphene for Heavy Naphtha Hydro-desulfurization reaction

Document Type : Articles

Authors

1 Chemical Engineering Department, College of Engineering, University of Babylon, Iraq

2 Chemical Engineering Department, College of Engineering, University of Baghdad, Iraq

Abstract

Cobalt and Molybdenum oxides supported on graphene catalyst CoMo/G were prepared then its activity for hydro-desulfurization reaction HDS was examined in this research. The catalyst was characterized by X-ray diffraction XRD, Fourier transform infrared spectroscopy FTIR, and energy dispersive spectroscopy EDS while surface morphology was tested by scanning electronic microscopy SEM and atomic force microscopy AFM. The texture properties (specific surface area and pore volume) are measured by the Brunauer, Emmett and Teller BET method. The catalyst activity investigation was conducted by heavy naphtha HDS reaction in a fixed bed reactor, this study investigated the effect of temperature (250-325) ºC, Liquid Hourly Space Velocity LHSV (3-6) hr.-1 and hydrogen partial pressure (1-1.3) MPa while gas/oil ratio was kept a constant 50 ml/ml, these variables’ impact was designed and analyzed by Taguchi design of experiment DOE with using MINITAB software. The results showed that sulfur removing percentage SR% increases with both increasing of temperature and hydrogen partial pressure whereas LHSV has the opposite effect on SR%. HDS reaction kinetics parameters were estimated by experiment results employing Levenberg-Marquardt and SPSS software version 20; the results showed the HDS reaction which followed 1.863 order, reaction rate constant and activation energy, is 32.309 kJ/mol. 

Graphical Abstract

Preparation, Characterization and, Activity of CoMo supported on Graphene for Heavy Naphtha Hydro-desulfurization reaction

Highlights

  • Graphene was chosen as catalyst support via its high thermal, mechanical, and chemical stability.
  • The process of removing sulfur is an important process in the petroleum industry because of the bad consequences caused by the presence of sulfur compounds in petroleum products.
  • The hydrodesulphurization process effected by many variables e.g. reaction temperature, hydrogen pressure, space velocity, oil/hydrogen ratio, etc.

Keywords


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