Abstract
Carbon-enriched coal fly ash was evaluated in this work as a low-cost adsorbent for SO 2 removal from stack gases. The unburned carbon in coal fly ash was concentrated by mechanical sieving and vegetal oil agglomeration. The carbon concentrates were activated with steam at 900 °C in order to develop porosity onto the samples. The performance of these samples in the SO 2 abatement was tested in the following conditions: 100 °C, 1000 ppmv SO 2, 5% O 2, 6% water vapor. A good SO 2 removal capacity was shown by some of the studied samples that can be related to their textural properties. Cycles of SO 2 adsorption/regeneration were carried out in order to evaluate the possibility of thermal regeneration and re-use of these carbons. Regeneration of the exhausted carbons was carried out at 400 °C of temperature and a flow of 25 ml/min of Ar. After each cycle, the SO 2 removal capacity of the sample decreases.
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