Audio cassettes hold the key to enhancing Fischer–Tropsch catalysis. Catalysts based on ultra‐thin cobalt shells surrounding cheap iron oxide cores (see picture) are developed, an approach previously optimized for preparing magnetic tape for audio cassettes. These particles are easily made on a large scale, and are excellent Fischer–Tropsch catalysts, giving good diesel fractions.

Audiokassetten sind der Schlüssel zu einer verbesserten Fischer‐Tropsch‐Katalyse, denn schon im Zusammenhang mit deren Magnetbändern wurde die Herstellung von Partikeln aus billigen Eisenoxid‐Kernen mit sehr dünnen Cobalt‐Schalen (siehe Bild) optimiert. Diese Partikel sind ausgezeichnete Fischer‐Tropsch‐Katalysatoren für die Herstellung guter Diesel‐Fraktionen und leicht im großen Maßstab zugänglich.

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Langmuir‐Hinselwood (LH) and power rate equations were applied to describe the kinetics of the Fischer‐Tropsch reaction on cobalt catalysts and manganese‐doped cobalt catalysts supported on carbon nanotubes (CNTs). LH‐based kinetics characterize the activity behavior of the unpromoted Co/CNT system satisfactorily, but fail with respect to the manganese‐promoted Co/CNT catalyst. An alternative LH equation is able to fit the experimental data, but the fitting parameters are out of the range of usual values and underrate the activity at ambient pressure regardless of manganese promotion. Application of power law rate expressions results in satisfying characterization of the kinetics in the whole CO pressure range in the promoted case and within a defined range of CO pressure in the unpromoted case.

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