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Korean Journal of Chemical Engineering

, Volume 35, Issue 6, pp 1263–1273 | Cite as

Kinetic models of Fischer-Tropsch synthesis reaction over granule-type Pt-promoted Co/Al2O3 catalyst

  • Hyun Mo Koo
  • Myung June Park
  • Dong Ju Moon
  • Jong Wook Bae
Catalysis, Reaction Engineering
  • 105 Downloads

Abstract

Kinetic models of CO hydrogenation to paraffinic hydrocarbons through Fischer-Tropsch synthesis (FTS) reaction were studied by using Langmuir-Hinshelwood Hougen-Watson (LHHW) model of 16 different reaction steps with a pseudo steady-state assumption (PSSA) on the prototype Pt-promoted Co/Al2O3 catalyst having a granule size of ∼1 mm of spherical γ-Al2O3 support (surface area of 149m2/g). The derived kinetic models from ten sets of experimental data by altering the reaction conditions such as temperatures, pressures, space velocities and H2/CO molar ratios were found to be well fitted with reasonable kinetic parameters and small errors of conversion of CO and hydrocarbon distributions in terms of mean absolute relative residual (MARR) and relative standard deviation error (RSDE). The derived reaction rates and CO activation energy of -86 kJ/mol well correspond to the our previously reported results using power-type catalysts. Based on the LHHW model with PSSA, the possible chemical intermediates on the granule ball-type Co-Pt/Al2O3 surfaces were precisely considered to explain the typical adsorption, initiation, propagation and termination steps of FTS reaction as well as to derive elementary reaction rates with their kinetic parameters and hydrocarbon distributions. The derived kinetic models were further used to verify temperature-profiles in a pilot-scale fixed-bed tubular FTS reactor with a packing depth of 100 cm catalyst, and it confirmed that the temperature gradients were less than 10 °C in a length of reactor by effectively removing the generated heat by an exothermic FTS reaction.

Keywords

Fischer-Tropsch Synthesis (FTS) Reaction Cobalt-based FTS Catalyst Kinetic Parameter Estimations Langmuir-Hinshelwood Hougen-Watson (LHHW) Model Pseudo Steady-state Assumption (PSSA) 

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Kinetic models of Fischer-Tropsch synthesis reaction over granule-type Pt-promoted Co/Al2O3 catalyst

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2018

Authors and Affiliations

  1. 1.School of Chemical EngineeringSungkyunkwan University (SKKU)Suwon, Gyeonggi-doKorea
  2. 2.Department of Energy Systems ResearchAjou UniversitySuwon, Gyeonggi-doKorea
  3. 3.Clean Energy Chemical EngineeringKorea Institute of Science and Technology (KIST)Seongbuk-gu, SeoulKorea

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