(638g) Fischer-Tropsch Synthesis over Alumina Supported Cobalt Catalyst in a Fixed-Bed Reactor
In this work, Fischer-Tropsch Synthesis was carried out using 12wt% cobalt catalyst supported over Î³-Al2O3. The catalyst was synthesized using wetness impregnation technique using cobalt nitrate solution. After the impregnation, the catalyst was reduced using sodium borohydride (in the liquid-phase), whose addition was controlled by a timer-assisted peristaltic pump. After reduction, the catalyst is washed multiple times with ultrapure water to obtain neutral pH. The catalyst was loaded into a fixed-bed stainless steel reactor. The reactor temperature at the desired conditions was maintained by using a 3-zone tubular furnace (Carbolite make) and the reactor pressure was maintained using a backpressure regulator. All the experiments were carried out under isothermal conditions. The temperature was varied from 220-310oC, the pressure was varied from 5-20 atm, the hydrogen to carbon moxide ratio was varied from 0.75 to 3 and the gas hourly space velocity was varied from 5 â 100 1/hr. The products were characterized using Shimadzu GC-MS QP-2010 Plus employing Rt-Alumina Bond / Na2SO4 column and FID detector.
From the concentration of the compounds it was observed that the conversion of carbon monoxide increases with increase in temperature and pressure. But, the selectivity to hydrocarbons decreases with increase in temperature, increases with increase in pressure and also increase with increase in pressure and hydrogen to carbon monoxide ratio. The selectivity to hydrocarbons was calculated using chain growth probability (Î±) using Anderson-Sluz-Flory (ASF) distribution. The chain growth probability was found to vary from 0.48 to 0.76 depending on the reactor and flow conditions.
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