Effect of Pressure, H2/CO Ratio and Reduction Conditions on Co-Mn/CNT Bimetallic Catalyst Performance in Fischer-Tropsch Reaction

The effects of process conditions on Fischer–Tropsch Synthesis (FTS) product distributions were studied using a fixed-bed microreactor and a Co–Mn/CNT catalyst. Cobalt and Manganese, supported on Carbon Nanotubes (CNT) catalyst were prepared by a Strong Electrostatic Adsorption (SEA) method. CNT supports were initially acid and thermally treated in order to functionalize support to uptake more Co clusters. Catalyst samples were characterized by Transmitted Electron Microscope (TEM), particle size analyzer, and Thermal Gravimetric Analysis (TGA). TEM images showed catalyst metal particle intake on CNT support with different Co and Mn loading percentage. Performance test of Co–Mn/CNT in Fischer–Tropsch synthesis (FTS) was carried out in a fixed-bed micro-reactor at different pressures (from 1 atm to 25 atm), H2/CO ratio (0.5–2.5), and reduction temperature and duration. The reactor was connected to the online Gas Chromatograph (GC) for product analysis. It was found that the reaction conditions have the dominant effect on product selectivity. Cobalt catalyst supported on acid and thermal pre-treated CNT at optimum reaction condition resulted in CO conversion of 58.7% and C5+ selectivity of 59.1%.

[1]  D. Glasser,et al.  Fischer–Tropsch synthesis over iron catalysts supported on carbon nanotubes , 2005 .

[2]  Jaehyeon Park,et al.  A Simple, Accurate Determination of Oxide PZC and the Strong Buffering Effect of Oxide Surfaces at Incipient Wetness , 1995 .

[3]  Yongqing Zhang,et al.  Fischer–Tropsch synthesis: support, loading, and promoter effects on the reducibility of cobalt catalysts , 2002 .

[4]  Bert M. Weckhuysen,et al.  Effects of manganese oxide promoter on the CO and H2 adsorption properties of titania-supported cobalt Fischer–Tropsch catalysts , 2007 .

[5]  T. Rao,et al.  Flow injection on-line preconcentration and flame atomic absorption spectrometric determination of iron, cobalt, nickel, manganese and zinc in sea-water , 1999 .

[6]  Omid Akbarzadeh,et al.  Synthesis of Co/CNTs Catalyst via Strong Electrostatic Adsorption: Effect of Calcination Condition , 2015 .

[7]  A. Mirzaei,et al.  A silica supported Fe–Co bimetallic catalyst prepared by the sol/gel technique: Operating conditions, catalytic properties and characterization , 2010 .

[8]  J. Fierro,et al.  Strong dependence on pressure of the performance of a Co/SiO2 catalyst in Fischer–Tropsch slurry reactor synthesis , 2005 .

[9]  Y. Liu,et al.  Effect of reaction conditions on the catalytic performance of Fe-Mn catalyst for Fischer-Tropsch synthesis , 2007 .

[10]  Mohd Rafie Johan,et al.  Effect of Cobalt Catalyst Confinement in Carbon Nanotubes Support on Fischer-Tropsch Synthesis Performance , 2018, Symmetry.

[11]  Mehdi Shahedi Asl,et al.  Modulated large-pore mesoporous silica as an efficient base catalyst for the Henry reaction , 2018, Research on Chemical Intermediates.

[12]  Ahmad Tavasoli,et al.  Enhancement of bimetallic Fe-Mn/CNTs nano catalyst activity and product selectivity using microemulsion technique , 2014 .

[13]  Mingsheng Luo,et al.  Fischer–Tropsch synthesis: effect of water on Co/Al2O3 catalysts and XAFS characterization of reoxidation phenomena , 2004 .

[14]  K. Jun,et al.  Effect of CO2 in the feed stream on the deactivation of Co/γ-Al2O3 Fischer–Tropsch catalyst , 2008 .

[15]  M. Dry,et al.  Chemical concepts used for engineering purposes , 2004 .

[16]  J. Fierro,et al.  Evaluation of Pd/La2O3 catalysts for dry reforming of methane , 2007 .

[17]  Mohd Rafie Johan,et al.  Effect of Manganese on Co-Mn/CNT Bimetallic Catalyst Performance in Fischer-Tropsch Reaction , 2019, Symmetry.

[18]  C. Satterfield,et al.  Intrinsic kinetics of the Fischer-Tropsch synthesis on a cobalt catalyst , 1991 .

[19]  Yong Yang,et al.  Study of an iron-manganese Fischer–Tropsch synthesis catalyst promoted with copper , 2006 .

[20]  H. Schulz,et al.  Construction of the Fischer Tropsch regime with cobalt catalysts , 2002 .

[21]  P. Maitlis,et al.  The role of electrophilic species in the Fischer-Tropsch reaction. , 2009, Chemical communications.

[22]  Yongqing Zhang,et al.  Fischer-Tropsch synthesis: effect of water on the catalytic properties of a Co/SiO2 catalyst , 2002 .

[23]  A. Mirzaei,et al.  Modeling and operating conditions optimization of Fischer–Tropsch synthesis in a fixed-bed reactor , 2012 .

[24]  Hossein Atashi,et al.  Kinetic study of Fischer–Tropsch process on titania-supported cobalt–manganese catalyst , 2010 .

[25]  A. Mirzaei,et al.  Effect of process conditions on the surface reaction rates and catalytic performance of MgO supported Fe–Co–Mn catalyst for CO hydrogenation , 2012 .

[26]  Nimir O. Elbashir,et al.  Enhanced Incorporation of α-Olefins in the Fischer−Tropsch Synthesis Chain-Growth Process over an Alumina-Supported Cobalt Catalyst in Near-Critical and Supercritical Hexane Media , 2005 .

[27]  W. Schuhmann,et al.  Effect of reduction temperature on the preparation and characterization of Pt-Ru nanoparticles on multiwalled carbon nanotubes. , 2009, Langmuir : the ACS journal of surfaces and colloids.

[28]  F. Fernandes.  Polymerization Kinetics of Fischer‐Tropsch Reaction on Iron Based Catalysts and Product Grade Optimization , 2005 .

[29]  Omid Akbarzadeh,et al.  Influence of Acid and Thermal Treatments on Properties of Carbon Nanotubes , 2013 .

[30]  Omid Akbarzadeh,et al.  Synthesis of Co/CNTs via Strong Electrostatic Adsorption: Effect of Metal Loading , 2014 .

[31]  Rajesh A. Khatri,et al.  Carbon Nanotube Docking Stations: A New Concept in Catalysis , 2009 .

[32]  Mohd Rafie Johan,et al.  Effects of Cobalt Loading, Particle Size, and Calcination Condition on Co/CNT Catalyst Performance in Fischer-Tropsch Reactions , 2018, Symmetry.

[33]  Omid Akbarzadeh,et al.  Synthesis and Characterization of Co/CNTs Catalysts Prepared by Strong Electrostatic Adsorption (SEA) Method , 2014 .

[34]  R. Everson,et al.  Cobalt as an alternative Fischer-Tropsch catalyst to iron for the production of middle distillates , 1997 .

[35]  Mohd Rafie Johan,et al.  Effect of pH, Acid and Thermal Treatment Conditions on Co/CNT Catalyst Performance in Fischer-Tropsch Reaction , 2019, Symmetry.

[36]  Mostafa Feyzi,et al.  Effects of promoters and calcination conditions on the catalytic performance of iron–manganese catalysts for Fischer–Tropsch synthesis , 2011 .

[37]  Enrique Iglesia,et al.  Design, synthesis, and use of cobalt-based Fischer-Tropsch synthesis catalysts , 1997 .

[38]  Börje Sten Gevert,et al.  The effect of synthesis gas composition on the Fischer–Tropsch synthesis over Co/γ-Al2O3 and Co–Re/γ-Al2O3 catalysts , 2007 .

[39]  Omid Akbarzadeh,et al.  Dispersion of Co/CNTs via strong electrostatic adsorption method: Thermal treatment effect , 2015 .