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T. Rostovshchikova, V. Smirnov, O. Kiseleva, V. Yushcenko, M. Tzodikov, Yu. Maksimov, et al., “Acidic and Catalytic Properties of Silica Modified by Iron Oxide Nanoparticles,” Catalysis Today, Vol. 152, No. 1-4, 2010, pp. 48-53. doi:10.1016/j.cattod.2009.10.017

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• TITLE: TPR Study of Core-Shell Fe@Fe3O4 Nanoparticles Supported on Activated Carbon and Carbon Nanotubes

  AUTHORS: Igor Bychko, Yevhen Kalishyn, Peter Strizhak

  KEYWORDS: Iron; Nanoparticles; Carbon Nanotubes; Temperature-Programmed Reduction

  JOURNAL NAME: Advances in Materials Physics and Chemistry, Vol.2 No.1, March 19, 2012

  ABSTRACT: Core-shell nanoparticles Fe@Fe3O4 supported on activated carbon (AC) and carbon nanotubes (CNTs) have been studied by H2 temperature-programmed reduction (TPR). Nanoparticles with size of 6.5 nm were synthesized by iron(II) oleate thermal decomposition and were supported on activated carbon and carbon nanotubes by colloid deposition method. The nanoparticles Fe@Fe3O4 are characterized by TEM and IR. Reduction of nanoparticles on AC starts at 140?C, whereas reduction of nanoparticles on CNTs starts at 200?C. Moreover, gasification of CNTs with methane releasing starts at 450?C, whereas gasification of AC is negligible at temperatures up to 800?C. All these findings illustrate a strong difference in the interaction between nanoparticles and the support material for AC and CNTs.