Intrinsic and Effective Kinetics of Cobalt‐Catalyzed Fischer‐Tropsch Synthesis in View of a Power‐to‐Liquid Process Based on Renewable Energy

Abstract

The production of liquid hydrocarbons based on CO2 and renewable H2 is a multi‐step process consisting of water electrolysis, reverse water‐gas shift, and Fischer‐Tropsch synthesis (FTS). The syngas will then also contain CO2 and probably sometimes H2O, too. Therefore, the kinetics of FTS on a commercial cobalt catalyst was studied with syngas containing CO, CO2, H2, and H2O. The intrinsic kinetic parameters as well as the influence of pore diffusion (technical particles) were determined. CO2 and H2O showed only negligible or minor influence on the reaction rate. The intrinsic kinetic parameters of the rate of CO consumption were evaluated using a Langmuir‐Hinshelwood (LH) approach. The effectiveness factor describing diffusion limitations was calculated by two different Thiele moduli. The first one was derived by a simplified pseudo first‐order approach, the second one by the LH approach. Only the latter, more complex model is in good agreement with the experimental results.

Kinetics of CO2 Hydrogenation to Hydrocarbons over Iron–Silica Catalysts

“…The application of the Langmuir-Hinshelwood type rate equation( with the adsorptiont erms) should result with similard ependency of the reactionr ate on the value of d P À1 ;r esulting in different slopes due to different rate equations. [38][39][40][41] As illustrated in Figure 3, the catalyst particle size also has a large effect on the hydrocarbon distribution. For the two catalyst systems witht he smallest particle diameters much higher chain growth probabilities are observed.…”

Syngas Production via Reverse Water‐Gas Shift Reaction over a Ni‐Al2O3 Catalyst: Catalyst Stability, Reaction Kinetics, and Modeling

“…Such a power-to-liquid (PTL) process based on CO 2 and renewable H 2 is a multistep process and consists of the following three subsequent stages ( Fig. 1), details in [3][4][5][6]:…”

“…Whereas various research work on FTS within in this concept has already been published [5][6][7], this work focuses on the syngas production via RWGS on a commercial Ni catalyst (Eq. (2)).…”

Hydrocracking of Fischer‐Tropsch Wax with Tungstovanadophosphoric Salts as Catalysts

“…FTS yields a variety of hydrocarbons ranging from methane to long‐chain hydrocarbons (waxes). In order to increase the yield of desired liquid fuels (gasoline, jet fuel, and diesel oil), the waxes can be processed downstream via hydrocracking .…”