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M. Vrinat - One of the best experts on this subject based on the ideXlab platform.

  • Evaluation of the Interest of NiMo Catalysts Supported on MgO-TiO2 for Hydrodesulfurization Applications
    Catalysis Letters, 2019
    Co-Authors: A. Lopez-benitez, G. Berhault, R. Silva-rodrigo, J. Antonio Rodriguez-avila, M. Vrinat, A. Guevara-lara
    Abstract:

    Hydrodesulfurization

  • Unexpected Support Effect in Hydrotreating: Evidence of a Metallic Character for ReS_2/Al_2O_3 and ReS_2/SiO_2 Catalysts
    Catalysis Letters, 2011
    Co-Authors: C. Sepulveda, R. Garcia, N. Escalona, D. Laurenti, L. Massin, M. Vrinat
    Abstract:

    Rhenium sulfide based catalysts were prepared by the incipient wetness impregnation method over alumina and silica supports and evaluated for 4,6-dimethyldibenzothiophene Hydrodesulfurization in a high-pressure stirred-tank reactor. The catalyst prepared over silica was about six times more active for Hydrodesulfurization than the corresponding catalyst prepared over alumina and a NiMo/Al_2O_3 industrial reference catalyst. This surprising and positive SiO_2 support effect was explained by a metallic character of the supported sulfide, which was demonstrated using a kinetic approach of competitive hydrogenations and by XPS characterization. Graphical Abstract

  • Supported rhenium sulfide catalysts in thiophene and 4,6-dimethyldibenzothiophene Hydrodesulfurization: Effect of acidity of the support over activities
    Applied Catalysis A : General, 2011
    Co-Authors: C. Sepulveda, R. Garcia, N. Escalona, D. Laurenti, V. Belliere, C. Geantet, M. Vrinat
    Abstract:

    Three different zeolites, gamma-alumina and silica supports were used to prepare ReS2 catalysts by incipient wetness impregnation of ammonium perrhenate (NH4ReO4). The catalysts were characterized and tested in the Hydrodesulfurization (HDS) of thiophene in an atmospheric fixed bed reactor, and of the 4,6-dimethyldibenzothiophene (4,6-DMDBT) HDS in a high pressure stirred tank reactor. The results showed that the acidity of the zeolites has a detrimental influence over Hydrodesulfurization activity of the Re sulfide, contrarily to the enhancement observed previously with zeolite-supported Mo sulfide catalysts. The catalyst prepared over a non-acidic zeolite (HSZ-390) was found very efficient in thiophene HDS and comparable to silica for 4,6-DMDBT. (C) 2010 Elsevier B.V. All rights reserved.

  • Deactivation of MoS_2 catalysts during the HDS of thiophene
    Catalysis Letters, 1999
    Co-Authors: F. Pedraza, M. Vrinat, S. Fuentes, M. Lacroix
    Abstract:

    Catalytic properties of unsupported MoS_2 catalysts in the thiophene Hydrodesulfurization reaction were determined in the temperature range 623–653 K. The catalysts were prepared by ex situ decomposition of ammonium thiomolybdate (ATM) crystals in a mixture of 15% H_2S in H_2 at 673 K. Activity of catalysts decreased very rapidly before reaching a steady state after 15 h on‐stream. The thiophene conversion went down from 10–12 to 3–4% in that time. The surface area of the catalysts also decreased during the catalytic reaction from 40–50 to 8–10 m^2/g. Selectivity for Hydrodesulfurization, hydrogenation and isomerization reactions was affected distinctly by the deactivation process. By increasing the reaction time, double‐bond isomerization increased, hydrogenation of butenes decreased and Hydrodesulfurization remained constant. Results indicate that the main cause of activity decay was surface area loss that was due to sintering of MoS_2 crystallites. Selectivity variation indicates that different active sites are involved for the three reactions. A deactivation model involving diminution of active sites located in edge and rim sites of small MoS_2 particles is proposed to explain the variation of product distribution.

C. Sepulveda - One of the best experts on this subject based on the ideXlab platform.

Masatoshi Sugioka - One of the best experts on this subject based on the ideXlab platform.

Adrian Bonilla-petriciolet - One of the best experts on this subject based on the ideXlab platform.

  • Multiobjective optimization of a Hydrodesulfurization process of diesel using distillation with side reactor
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Erick Yair Miranda-galindo, Juan Gabriel Segovia-hernández, Salvador Hernández, Adrian Bonilla-petriciolet
    Abstract:

    The distillation with side reactor has been proposed to remove sulfur compounds of diesel. The design and optimization of a Hydrodesulfurization process involve the selection of the configuration and the operating conditions to minimize the total annual cost, CO2 emissions, and the amount of sulfur compounds. In general, the optimal design of a Hydrodesulfurization process is a nonlinear and multivariable multiobjective optimization problem, with the presence of both continuous and discrete design variables. In particular, stochastic multiobjective optimization algorithms are capable of solving, robustly and efficiently, challenging optimization problems, and they appear to be a suitable alternative for the design and optimization of complex process schemes. In this study, we have performed the multiobjective optimization of five configurations of distillation with a side reactor for the Hydrodesulfurization process including an alternative using reactive distillation. The multiobjective optimization prob...

  • Multiobjective Optimization in Distillation with Reactor-Side for Hydrodesulfurization Process of Diesel
    Computer Aided Chemical Engineering, 2012
    Co-Authors: Erick Yair Miranda-galindo, Juan Gabriel Segovia-hernández, Salvador Hernández-castro, Adrian Bonilla-petriciolet, Gade Pandu Rangaiah
    Abstract:

    Abstract The distillation reactor-side has been proposed to remove sulfur compounds of diesel. The design and optimization of a Hydrodesulfurization process involve the selection of the configuration and the operating conditions to minimize the total annual cost, CO 2 emissions and the amount of sulfur compounds. In general, the optimal design of Hydrodesulfurization process is a highly non-linear and multivariable multiobjective optimization problem, with the presence of both continuous and discontinuous design variables. In particular, stochastic multiobjective optimization algorithms are capable of solving, robustly and efficiently, challenging optimization problems, and they appear to be a suitable alternative for the design and optimization of complex process schemes. In this study, we have implemented a multi-objective optimization method to obtain the design and optimization of three distillation reactor-side in the Hydrodesulfurization process. The results obtained in the Pareto Fronts indicate competition between total annual cost, CO 2 emissions and the amount of sulfur compounds of the Hydrodesulfurization process. These Pareto Fronts are useful to identify proper conditions for the operation of this process. In general, the reduction of the amount of sulfur compounds increases the TAC and CO 2 emissions. However, we can identify operating conditions where the TAC can be reduced.

N. Escalona - One of the best experts on this subject based on the ideXlab platform.