Kinetics Analysis of Steam Reforming of Methane on Sponge Iron
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2022-01-05
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RAMOS, R. T.
FERREIRA NETO, J. B.
João Guilherme Rocha Poço
TAKANO, C.
KOLBEINSEN, L.
RINGDALEN, E.
FERREIRA NETO, J. B.
João Guilherme Rocha Poço
TAKANO, C.
KOLBEINSEN, L.
RINGDALEN, E.
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ISIJ International
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RAMOS, R. T.; FERREIRA NETO, J. B.; POÇO, J. G. R.; TAKANO, C.; KOLBEINSEN, L.; RINGDALEN, E. Kinetics Analysis of Steam Reforming of Methane on Sponge Iron. Kinetics Analysis of Steam Reforming of Methane on Sponge Iron, v. 62, n. 504-514, Jan. 2022.
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© 2022 The Iron and Steel Institute of Japan.The kinetics of steam reforming of methane catalyzed by sponge iron was studied at temperatures between 875°C and 1 050°C. Results shows that sponge iron acts as a catalyst and methane conversion is increased in higher temperatures and with a higher H2/H2O ratio in the inlet gas. A kinetic model based on chemical reaction control fits well the experimental data up to methane conversion of 0.5 with an apparent activation energy of 258 kJ/mol. Pore diffusion limits the reaction rate more intensely at higher conversions of methane, higher temperatures, and larger particle size (from 9 to 17 mm). Two types of industrial pellets were compared showing that microstructural properties such as porosity, pore size, and grain size impact reduction rate with hydrogen and the catalytic property of the obtained sponge iron.