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Kinetic study of Fischer–Tropsch process on titania-supported cobalt–manganese catalyst
H. Atashi,F. Siami,A.A. Mirzaei,M. Sarkari 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
An active cobalt–manganese catalyst was prepared by co-precipitation method, and was also tested for hydrogenation of carbon monoxide to light olefins. The catalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET) surface area techniques. The kinetic experiments on a well-characterized Co–Mn/TiO2 catalyst were performed in a fixed-bed micro-reactor, and were also conducted in a temperature range of 190–280 8C, pressure range of 1–10 bar, H2/CO feed ratio (mol/mol) range of 1–3 and a space velocity range of 2700–5200 h1. Two kinetic expressions based on Langmuir–Hinshelwood–Houngen–Watson (LHHW) mechanism were observed to fit the experimental data accurately for Fischer–Tropsch synthesis reaction. The kinetic parameters were estimated with non-linear regression method. Activation energies obtained were 35.131 and 44.613 kJ/mol for optimal kinetics models.
M. Arsalanfar,H.R. Bozorgzadeh,H. Atashi,A.A. Mirzaei 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
The Fe–Co–Mn/MgO catalyst was prepared using co-precipitation procedure; effects of reaction conditions on the catalytic performance for Fischer–Tropsch synthesis have been investigated. Experiments were carried out under a wide range of reaction conditions including reaction temperature of 473–673 K, pressure of 1–10 bar, H2/CO feed molar ratio of 1–4 and space velocity of 3150–7200 h-1. We also reported further results regarding the effect of various operational conditions on different surface reaction rates. It was found that the optimum operational conditions are H2/CO = 2/1, GHSV = 4500 h-1, T = 573 K and P = 1 bar. Characterization of both precursor and calcined catalysts was carried out using XRD, SEM, BET and TPR.
Kinetic study of CO hydrogenation on the MgO supported Fe–Co–Mn sol–gel catalyst
A.A. Mirzaei,A. Pourdolat,M. Arsalanfar,H. Atashi,A.R. Samimi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
The kinetic of the Fischer–Tropsch synthesis over the MgO supported Fe–Co–Mn catalyst prepared using sol–gel procedure, was investigated in a fixed bed micro-reactor. Experimental conditions were varied as follow: reaction pressure 5–20 bar, reaction temperature 220–250 8C, H2/CO feed molar ratio of 0.67–2and space velocity range of 2400–3600 h1. 18 models according to the Langmuir–Hinshelwood–Hougen–Watson (LHHW) type rate equation were derived, and the reaction rate is fitted fairly well by one kinetic expressions based on LHWW mechanism. The kinetic parameters were estimated with nonlinear regression method. The activation energy was obtained 110.9 kJ/mol for the best-fitted model.
M. Shiva,H. Atashi,F. Farshchi Tabrizi,A.A. Mirzaei 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Combined UBI-QEP/LHHW methodology was employed for kinetic modeling of carbon monoxide hydrogenation to light olefins on a bimetallic Fe–Co catalysis in a fixed bed micro-reactor. In combination with apparent activation energies obtained from UBI-QEP approach, the experimental data from central composite designs were employed to fit several LH/ER rate equations. A new rate equation for CO consumption and a new mechanism based on parallel formyl/carbide with two RDS elementary reactions was concluded. It was also concluded that CO* is MARI on Fe–Co catalysis surface and its coverage on the catalyst was estimated to be 0.5 ml.