Abstract
A novel structured catalytic material consisted of sintered metal fibers (SMF) filters with the surface coated by carbon nanofibers (CNF) has been developed. The CNF were grown directly on the metal surface via catalytic ethane pyrolysis. The Fe/Ni-nanoparticles were formed in situ by oxidation/reduction of the Inconel SMF. The kinetics of CNF formation has been studied. During the first 4 hours, the creation of new catalytic sites on the Inconel surface exceeded the deactivation, leading to an observed increase of the CNF formation rate. This period was followed by CNF growth extinction due to an encapsulation of the catalytic particles by carbon. Partial orders of 1.1 and -1.8 towards ethane and hydrogen, respectively, and an apparent activation energy of ∼240 kJ/mol strongly suggest that the breakage of the C - C bond in ethane is the rate determining step during the CNF formation.
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