Determinação dos parâmetros de arrhenius da reação de sorção do dióxido de enxofre por calcário

Abstract

Recebido em 16/10/06; aceito em 18/1/07; publicado na web em 2/7/07 DETERMINATION OF THE ARRHENIUS PARAMETERS IN THE SULFUR DIOXIDE SORPTION REACTION BY LIMESTONE. Sulfur emission in coal power generation is a matter of great environmental concern and limestone sorbents are widely used for reducing such emissions. Thermogravimetry was applied to determine the effects of the type of limestone (calcite and dolomite), particle size (530 and 650 µm) and atmosphere (air and nitrogen) on the kinetics of SO 2 sorption by limestone. Isothermal experiments were performed for different temperatures (650 to 950 o C), at local atmospheric pressure. The apparent activation energies, as indicated by the slope of the Arrhenius plot, resulted between 3.03 and 4.45 kJ mol-1 for the calcite, and 11.24 kJ mol-1 for the dolomite.