Abstract
Ultrafine Fe-Si-C powders were prepared from mixed gases of SiH4-CH4-Fe(CO)5 using a newly developed thermal-plasma apparatus with a dual-radio-frequency-coupled-plasma-torch system. The phases of the powders prepared were classified into two groups; one composed of β-FeSi2 which was prepared by rapid quenching, while the other was composed of α-Fe, Fe3Si, Fe5Si3, FeSi, β-SiC and amorphous Si, which were prepared by slow quenching. The diameters of these powders were in the range 5–50 nm. The catalytic activities of these powders for Fischer-Tropsch synthesis were examined. The ultrafine β-FeSi2 powder was very active for the selective formation of olefin. On the other hand, powders of α-Fe, Fe3Si and Fe5Si3 were low in their selectivity but gave high CO conversion. Relations between the plasma conditions for the preparation of ultrafine Fe-Si-C powders and their catalytic properties are discussed.
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Y. Saito, Shokubai 27 (2) (1985) 65.
H. Arakawa, Surface 20 (1) (1982) 44.
J. T. Yardley and A. Gupta Electro-optics/Laser Int. Jpn. 1 (1984) p. 9.
T. Kameyama, K. Sakanaka, A. Motoe, T. Tsunoda, T. Nakanaga, N. I. Wakayama, H. Takeo and K. Fukuda, J. Mater. Sci. 25 (1990) 1058.
H. Konoe et al., “Handbook of magnetism” (Asakura Press, Tokyo, 1975) p. 524.
O. Kubaschewski, in “Iron-binary phase diagrams”, (Springer-Verlag, Berlin, 1982) p. 137.
H-J. Jung, K. Yoon and Vannice, presented at the 1981 Annual AIChE Meeting New Orleans, LA, (November 8–12, 1981).
T. Sakata, and I. Nishida, J. Jpn. Inst. Metals 15 (1) (1976) 11.
T. Yoshida, K. Nakanaga, T. Harada, and K. Akashi, Plasma Chem. Plasma Proc. 1 (1981) 113.
T. Nakanaga, N. I. Wakayama, H. Takeo, and A. Motoe, K. Sakanaka, T. Tsunoda, T. Kameyama, K. Fukuda, in Proceeding of the Eighth International Symposium on Plasma Chemistry, Tokyo, August 1987, edited by K. Akashi and A. Kinbara (IUPAC, Tokyo, 1987) p. 385.
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Kameyama, T., Sakanaka, K., Arakawa, H. et al. Preparation of ultrafine Fe-Si-C powders in a radio-frequency thermal plasma and their catalytic properties. Journal of Materials Science 28, 4630–4636 (1993). https://doi.org/10.1007/BF00414251
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DOI: https://doi.org/10.1007/BF00414251