Artículos de revistas
Interpretação do mecanismo de difusão no processo gás-sólido da reação de dessulfurização
Fecha
2010Registro en:
Química Nova, v.33, n.9, p.1887-1891, 2010
0100-4042
10.1590/S0100-40422010000900013
Autor
MORTARI, Daniela Andresa
CRNKOVIC, Paula Manoel
ÁVILA, Ivonete
MILIOLI, Fernando Eduardo
Institución
Resumen
The present paper aims to interpret the SO2 diffusion mechanism process for two different limestones: a calcite and a dolomite. In previous study, the apparent activation energies for sulfation reaction were between 3.03 and 4.45 kJ mol-1 for the calcite, and 11.24 kJ mol-1 for the dolomite. Using nitrogen porosimetry it was possible to observe that the dolomite presents mesopores of 0.03 μm, while the calcite presents mesopores of 0.01 μm. The evaluation of limestones porous structure together with their kinetic parameters, allowed concluding that the diffusion mechanism follows Fick law and Knudsen law for dolomite and calcite, respectively.