Sulfur dioxide removal by calcium-modified fibrous KCC-1 mesoporous silica: kinetics, thermodynamics, isotherm and mass transfer mechanism

The removal of sulfur dioxide from industrial flue gas through dry flue gas desulfurization method commonly involves the use of adsorption process with porous sorbent. The efficiency of this process is highly dependent on the adsorption capacity and the adsorption rate of SO 2 onto the sorbent mater...

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Bibliographic Details
Published in:Journal of porous materials 2022-04, Vol.29 (2), p.501-514
Main Authors: Hanif, Muhammad Adli, Ibrahim, Naimah, Md. Isa, Khairuddin, Md. Ali, Umi Fazara, Tuan Abdullah, Tuan Amran, Jalil, Aishah Abdul
Format: Article
Language:English
Subjects:
Additives
Adsorption
Calcium
Catalysis
Characterization and Evaluation of Materials
Chemisorption
Chemistry
Chemistry and Materials Science
Exothermic reactions
Fixed bed reactors
Fixed beds
Flue gas
Isotherms
Mass transfer
Physical Chemistry
Silicon dioxide
Sorbents
Sulfur
Sulfur dioxide
Sulfur removal
Surface chemistry
Thermodynamics
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Summary:The removal of sulfur dioxide from industrial flue gas through dry flue gas desulfurization method commonly involves the use of adsorption process with porous sorbent. The efficiency of this process is highly dependent on the adsorption capacity and the adsorption rate of SO 2 onto the sorbent materials. The use of KCC-1 mesoporous silica modified with calcium metal additives (Ca/KCC-1) in SO 2 adsorption is examined in a fixed bed reactor system. The adsorption capacity of Ca/KCC-1 is found to be critically governed by the reaction temperature and inlet SO 2 concentration where low values of both parameters are favorable to achieve the highest adsorption capacity of 3241.94 mg SO 2 /g sorbent. SO 2 molecules are adsorbed on the surface of Ca/KCC-1 by both physisorption and chemisorption processes as assumed by the Avrami kinetic model. Thermodynamic study shows that the process is exothermic and spontaneous in nature, and changes from an ordered stage on the surface of KCC-1 towards an increasingly random stage. The process is well explained by Freundlich isotherm model indicating a slightly heterogeneous process and moderate adsorption capacity. The adsorption stage is limited by film diffusion at the initial stage and by intraparticle diffusion during the transfer of SO 2 into the network of pores before adsorption takes place on the active sites.
ISSN:1380-2224
1573-4854
DOI:10.1007/s10934-021-01195-w