Response surface methodology applied to the evaluation of the SO 2 sorption process in two Brazilian limestones
Nenhuma Miniatura disponível
Data
2013-06-20
Autores
Mortari, Daniela A.
Ávila, Ivonete [UNESP]
Crnkovic, Paula M. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
This paper proposes a response surface methodology to evaluate the influence of the particle size and temperature as variables and their interaction on the sulfation process using two Brazilian limestones, a calcite (ICB) and a dolomite (DP). Experiments were performed according to an experimental design [central composite rotatable design (CCRD)] carried out on a thermogravimetric balance and a nitrogen adsorption porosimeter. In the SO 2 sorption process, DP was shown to be more efficient than ICB. The best results for both limestones in relation to conversion and Brunauer-Emmett-Teller (BET) surface area were obtained under central point conditions (545 μm and 850 C for DP and 274 μm and 815 C for ICB). The optimal values for conversion were 52% for DP and 37% for ICB. For BET surface area, the optimal values were 35 m2 g-1 for DP and 45 m2 g-1 for ICB. A relationship between conversion and pore size distribution has been established. The experiments that showed higher conversions also exhibited more pores in the region between 20 and 150 Å and larger BET surface area, indicating that the amount of smaller pores may be an important factor in the reactivity of limestones. © 2013 American Chemical Society.
Descrição
Palavras-chave
BET surface area, Brunauer-emmett-teller surface areas, Central composite rotatable design, Nitrogen adsorption, Response surface methodology, Sorption process, Sulfation process, Thermo-gravimetric, Experiments, Gas adsorption, Optimal systems, Sulfur dioxide, Surface properties, Limestone
Como citar
Energy and Fuels, v. 27, n. 6, p. 2890-2898, 2013.