Synthesis, Characterization, and Catalytic Use of Acicular Iron Particles

The synthesis of granular iron particles via hydrotriorganoborate reduction of FeCl3 has been reported previously by several research groups. Notably, during the course of studying some of the reaction parameters involved in FeCl3 reduction, we discovered the experimental conditions necessary to syn...

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Bibliographic Details
Published in:Journal of catalysis 2002-05, Vol.208 (1), p.150-157
Main Authors: Takeuchi, Kenneth J., Marschilok, Amy C., Bessel, Carol A., Dollahon, Norman R.
Format: Article
Language:English
Subjects:
acicular iron particles
carbon nanofibers
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
granular iron particles
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The synthesis of granular iron particles via hydrotriorganoborate reduction of FeCl3 has been reported previously by several research groups. Notably, during the course of studying some of the reaction parameters involved in FeCl3 reduction, we discovered the experimental conditions necessary to synthesize acicular iron particles, at low temperature and low pressure, in the absence of a constraining medium. Specifically, the effects of the reaction temperature, the stirring rate, and the FeCl3 solution dropping rate on the size and morphology of the iron particles were examined. Under optimal conditions acicular iron particles were produced having diameters of ∼300 nm, lengths on the order of tens to hundreds of micrometers, and surface areas of approximately 20 m2/g. Both the acicular and the granular iron particles were found to be active catalysts for the formation of carbon nanofibers from the reaction of carbon monoxide and hydrogen gases. The graphitic natures of the carbon nanofibers formed from either acicular or granular iron catalysts were characterized by HRTEM and XRD. Also, while both types of iron catalysts produced straight carbon nanofiber morphologies, the granular iron catalysts also formed carbon nanofibers with spiral gross morphologies. Finally, the diameters of the carbon nanofibers were comparable to the diameters of the acicular or granular iron catalysts.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.2002.3543