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Dry SO 2 Removal Process Using Calcium/Siliceous‐Based Sorbents: Deactivation Kinetics Based on Breakthrough Curves
Author(s) -
Dahlan I.,
Mohamed A. R.,
Kamaruddin A. H.,
Lee K. T.
Publication year - 2007
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200600336
Subject(s) - chemistry , flue gas , sorption , reaction rate constant , husk , fly ash , lime , sulfur dioxide , kinetics , volumetric flow rate , sorbent , mineralogy , adsorption , analytical chemistry (journal) , chemical engineering , chromatography , metallurgy , inorganic chemistry , materials science , thermodynamics , organic chemistry , physics , botany , quantum mechanics , engineering , biology
The removal of sulfur dioxide (SO 2 ) from simulated flue gas was investigated in a laboratory‐scale stainless steel fixed‐bed reactor using sorbents prepared from various siliceous materials, i.e., coal fly ash (CFA), oil palm ash (OPA) and rice husk ash (RHA) mixed with lime (CaO) by means of the water hydration method. Experiments were carried out with a flue gas flow rate of 150 mL/min, reaction temperature of 100 °C, and SO 2 concentration of 1000 ppm. It was found that sorbents prepared from RHA have high BET surface areas and high SO 2 sorption capacities, based on breakthrough curve analysis. In addition, the SO 2 breakthrough curves were also described in terms of a simple first‐order deactivation model containing only two rate constants, one of which, k s , describes the surface reaction rate constant while the other, k d , describes the deactivation rate constant. The values of k s and k d obtained from the deactivation kinetics model were in good agreement with the experimental breakthrough curves and were also compared with those available in the literature.