Study of mechanism and kinetic modeling of CO hydrogenation reaction over the impregnated Co-Ni/Al2O3 catalyst |
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| Authors: | Maryam Arsalanfar Mahdi Fatemi Nima Mirzaei Majid Abdouss Esmaeil Rezazadeh |
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| Affiliation: | 1. Department of Chemistry, Amirkabir University of Technology, Tehran, Iran;2. Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran;3. Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran |
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| Abstract: | An investigation of the kinetic and mechanism of CO hydrogenation reaction was performed on impregnated Co-Ni/Al2O3. Determination of kinetic parameters from the experiments was carried out in a micro fixed-bed reactor. Kinetic evaluations were performed under various operational conditions of T = 473–673 K, p = 1–14 bar, H2/CO = 1–3, and GHSV = 4,500 hr−1. Kinetic models and rate equations for CO consumption were obtained by using two main-type rate equations of Langmuir-Hinshelwood-Hougen-Watson (LHHW) and Eley-Rideal (ER). Estimation of various kinetic parameters was performed using a nonlinear regression method. According to the obtained experimental results and using statistical criteria, one kinetic expression based on the LHHW mechanism (-rCO = kp.bCO.PCO. bH2. PH2/[1+ bCO.PCO + bH2.PH2]2) was chosen as the best-fitted model. For this fitted model, the activation energy was found to be 109.2 kJ/mol. Characterization of the catalyst was also performed using X-ray diffraction (XRD), BET, scanning electron microscopy (SEM), and energy-dispersive x-ray spectrometer (EDS) techniques. |
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| Keywords: | characterization CO hydrogenation Co-Ni catalyst impregnation kinetic model |
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