Chain growth probability and chain terminal in Fischer-Tropsch synthesis over Cobalt supported silica catalystName : Dr. Saowaluk Intarasiri
Affliation : Faculty of Applied Science
University : King Mongkut’s University of Technology North Bangkok
Country : Thailand
Abstract: Polymerization of CO and H2 to produce long chain hydrocarbons via FTS was investigated over cobalt supported silica catalyst. Chain growth probability during the interval reaction time has been focused to understand the cycle time of terminated product in polymerization. Surface morphology and the reducibility of cobalt-based catalyst were carried out by BET and H2-TPR technique. The FTS performance was studied in a fixed bed reactor at 220 °C, 1 atm, and GHSV of 305 h-1 for 72hr time-on-stream using H2:CO ratio of 2:1. The FTS product was designed to be collected at 1, 3, 6, 9, 12, 18, 24, 48 and 72 hr. The product distribution and chain growth probabilities at the collected time were calculated using the Anderson–Schulz–Flory (ASF) equation. The results show that CO conversion, product yield and selectivity of long chain hydrocarbons increases when increasing time-on-stream. The average chain growth probability (α) of liquid product for 72 hr is 0.77, corresponding to gasoline to diesel range of hydrocarbons.
Keywords: Polymerization; Chain growth probability; Gasoline; Diesel; Fischer-Tropsch synthesis.