Methanation of carbon deposited directly from CO2 on rhodium-bearing activated magnetite
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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 60°C and showed 98% conversion at 300°C. The surface carbon was composed of elemental carbon (α-carbon) and polymerized carbon (β-carbon), the proportion being dependent on the density of carbon deposited. In temperature-programmed surface reaction, the extent of conversion of the α- and β-carbon to CH4 was 0.34 (α-carbon) and 0.53 (β-carbon), respectively, and the total conversion was 0.87. This result indicates that not only elemental carbon but polymerized carbon (β-carbon) could be converted to CH4 on the Rh-bearing activated (α-carbon) magnetite, whereas β-carbon is not hydrogenated on activated magnetite.
KeywordsPolymer Methanation Magnetite Active Material Surface Reaction
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- 5.M. Tsuji, K. Nishizawa, T. Yoshida and Y. Tamaura, J. Mater. Sci., submitted.Google Scholar