Comprehensive Polymerization Model for Fischer‐Tropsch Synthesis

Abstract

The polymerization kinetics of Fischer-Tropsch reactions on a cobalt-based catalyst was studied. A kinetic model was developed based on the alkyl and alkenyl mechanisms for hydrocarbon chain propagation that may occur simultaneously in the Fischer-Tropsch synthesis. The kinetic model comprised initiation of hydrocarbon chains, propagation, termination to paraffin and olefin and readsorption of olefin. The proposed model was validated by F-test and proved valid at a confidence level of 95 %.

On the structural, textural and morphological features of Fe-based catalysts supported on polystyrene mesoporous carbon for Fischer–Tropsch synthesis

“…The H 2 :CO feed ratio was set to 1:1 to increase chain propagation and decrease the chain termination ratio. This could be achieved by increasing the concentration of CO in the reaction media and decreasing the concentration of H 2 [35][36].…”

“…Catalytic tests were carried out at total pressures of 20, 25 and 30 atm, and temperatures of 513, 528 and 543 K, for a H 2 :CO feed ratio of 1:1 [35][36]. The synthesis gas was prepared by mixing H 2 and CO using two mass flow controllers (Alborg GFC-17) to obtain the desired H 2 /CO ratio.…”

A Comprehensive Kinetic Model of Fischer-Tropsch Synthesis over Supported Cobalt Catalyst

“…Great efforts have been done to elucidate the FTS reaction mechanism by Yang et al [9] over Fe catalyst. However, only few comprehensive models on the polymerization mechanism of the cobalt based Fischer-Tropsch reaction are described in literature [11][12][13]. The most important works on comprehensive kinetic model over cobalt catalyst have been done by Visconti [14], Fontenelle and Fernandes [11] and Kwack [15].…”

Dynamic Discrepancy Reduced Order Modeling for Fischer-Tropsch Synthesis Over Cobalt-based Catalyst

“…Despite these attempts, since a single parameter describes the distribution of the entire product range and is modeled by empirical power-law kinetics, some parameters end up not making physical sense (Van Der Laan & Beenackers, 1999). These types of models are primarily aimed at catalyst improvement (Fontenelle Jr & Fernandes, 2011). Due to the model being described by a single parameter, this type of model is the easiest to implement, computationally (Zhou, et al, 2010 (Zhang, et al, 2009).…”

“…A well-mixed reactor and isothermal behavior are assumed. The geometry and initial conditions are also taken from Visconti and Fontenelle's work (Fontenelle Jr & Fernandes, 2011). Initially CO and H2 were inlet to the system at a 5:1 molar ratio.…”