THE FIRST ORDER FISCHER-TROPSCH REACTION RATE CONSTANT CALCULATION FROM CARBON MONOXIDE BASED CONVERSION DATA
Jimmy, Elvianto Dwi Daryono, Harimbi Setyawati

Chemical Engineering Department, National Institute of Technology (ITN) Malang
Jln. Raya Karanglo kilometer 2, Malang, East Java, Indonesia 65143
Ph. +62811363906, Fax. +62341417636

Abstract

The Fischer-Tropsch synthesis (FTS) converts hydrogen (H2) and carbon monoxide (CO) into linear hydrocarbons as liquid fuel. The combination of Fe and Co (bimetallic Fe-Co) could increase the catalytic activity compared with individual Fe or Co as catalyst. The CO conversion could be use to calculate the reaction constant (k). This study emphasized the first order Fischer-Tropsch reaction constant calculation from monoxide based conversion data within the various temperature and iron-cobalt catalyst ratio. The data obtained from this study would be used to find optimum condition for this biofuel production over Fischer-Tropsch Synthesis. The catalyst performance was observed in a continuous fixed bed reactor using 1 gram Fe-Co/meso-HZSM-5 catalyst, 25 mL/min synthesis gas (15% CO, 30% H2, 55% N2) at various composition iron and cobalt weight ratio (10-40 %wt Fe and 60-90 %wt Co), various temperature (225C, 250C, 275C) at 20 bar. The catalyst 10Fe-90Co/mesoHZSM-5 application at 250C gave the highest CO conversion (58.26%). Kinetically, the value of the reaction rate constant (k) for each condition could be calculated with assuming: first order reaction, differential reactor model, operating conditions running at steady state. The calculation based on 1 gram catalyst in a differential reactor and first order reaction (FA0 = 3.75 mL/min- PA0 = 3 bar- compressibility factor = -0.5613). The best value of k (94210) was obtained from the application of 10Fe-90Co/mesoHZSM-5 catalyst at 250C.

Keywords: Fischer-Tropsch- iron-cobalt- first order- CO conversion- reaction rate constant

Topic: Renewable Energy Technologies