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Carbon-Support Catalyst/Sorbents Utilized in SO2 Adsorption in Flue Gas from Combustion
The objective of this study is to investigate the possibility of using carbon supporting metals catalyst/sorbents for the removal of SO2 from flue gas, expected to achieve higher SO2 conversion and sorbents utilized efficiently. The catalyst/sorbents were prepared by impregnating the carbon powders with the aqueous solutions of the nitrate of the metals. They are Cu/A.C., Ce/A.C. and Cu-Ce/A.C. catalyst/sorbents, respectively. A dry scrubber integrated with a frabic filter was employed in the pilot-scale fluidized bed incinerator to demonstrate the performance of catalyst/sorbents for removal of acid gases at selected catalyst/sorbents (Cu/A.C., Ce/A.C. and Cu-Ce/A.C.) and feedstocks (S, S+PVC, S+Pb and S+Cr). The physical and chemical characteristics of catalyst/sorbents prior to and after the experiment were analyzed. The feasibility of the catalyst/sorbents employed in the incineration system was also evaluated. The results indicated that the removal efficiency of SO2 in flue gas can be enhanced significantly by actived carbon impregnating with Cu, Ce and Cu-Ce, especially for Ce/A.C.. The Cu-Ce/A.C. catalyst/sorbent had a stable removal efficiency of SO2 while it was interfaced with more complicate composition of flue gas (SO2+HCl and SO2+Pb). However, the removal efficiency of SO2 of three indicated catalyst/sorbents decreased obviously when the feedstock contained Cr. Moreover, HCl, Pb, and Cr can be controlled simultaneously by Cu/A.C., Ce/A.C. and Cu-Ce/A.C. catalyst/sorbents during desulfurization process.
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