The synthesis of carbon nanotubes (CNTs) bychemical vapor deposition (CVD) of isobutane (i‐C4H10)over sodium‐exchanged K10‐montmorillonite based iron‐catalysts is investigated. By studying the influence ofiron‐addition (5–25wt%) on the catalyst performances, at700 °C, an empirical relationship is derived relating themass of CNTs synthesized with the exposed surface ofloaded iron, as resulting from simultaneous change ofnumber, size and dispersion of Fe‐nanoparticles availablefor the growth.
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