K. Mimori

Publications (2)4.03 Total impact

• Article: Methanation of carbon deposited directly from CO2 on rhodium-bearing activated magnetite

  K. Nishizawa, H. Kato, K. Mimori, T. Yoshida, N. Hasegawa, M. Tsuji, Y. Tamaura
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  ABSTRACT: Methanation reactivity was studied for the surface carbon deposited from CO2 on the surface of Rh-bearing activated magnetite. The most active material (Rh=0.83 wt %) for methanation was prepared by the impregnation method at 60C and showed 98% conversion at 300C. The surface carbon was composed of elemental carbon (-carbon) and polymerized carbon (-carbon), the proportion being dependent on the density of carbon deposited. In temperature-programmed surface reaction, the extent of conversion of the - and -carbon to CH4 was 0.34 (-carbon) and 0.53 (-carbon), respectively, and the total conversion was 0.87. This result indicates that not only elemental carbon but polymerized carbon (-carbon) could be converted to CH4 on the Rh-bearing activated (-carbon) magnetite, whereas -carbon is not hydrogenated on activated magnetite.
  Journal of Materials Science 12/1993; 29(3):768-772. · 2.02 Impact Factor
• Article: Carbon dioxide decomposition into carbon with the rhodium-bearing magnetite activated by H2-reduction

  K. Akanuma, K. Nishizawa, T. Kodama, M. Tabata, K. Mimori, T. Yoshida, M. Tsuji, Y. Tamaura
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  ABSTRACT: The CO2 decomposition into carbon with the rhodium-bearing activated magnetite (Rh-AM) was studied in comparison with the activated magnetite (AM). The Rh-AM and the AM were prepared by flowing hydrogen gas through the rhodium-bearing magnetite (Rh-M) and the magnetite (M), respectively. The rate of activation of the Rh-M to the Rh-AM was about three times higher than that of the M to the AM at 300 C. The reactivity for the CO2 decomposition into carbon with the Rh-AM (70% CO2 was decomposed in 40 min) was higher than that with the AM (30% in 40 min) at 300 C. The Rh-M was activated to the Rh-AM at a lower temperature of 250 C, and the Rh-AM decomposed CO2 into carbon at 250 C. On the other hand, the M was little activated at 250 C.
  Journal of Materials Science 12/1992; 28(4):860-864. · 2.02 Impact Factor