SO2 ADSORPTION ENHANCEMENT OVER AMINE/AMIDE PROMOTED MCM-41
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Amine/amide-support mesoporous material has been proven to enhance the acidic gas uptake. Herein, MCM-41 synthesized from rice-husk (RH) was employed as a molecular sieve supporter for dynamic SO2 adsorption. Four species of classified amine/amide including urea (U), monoethanolamine (MEA), triethylenetetramine (TETA), and dimethylformamide (DMF) were comparatively impregnated with RM. The SO2 adsorption was carried out in a fixed bed column at 42,000 hr-1 WHSV. DMF impregnated RM (DMF-RM) provided higher uptake capacity than other impregnated RMs. The SO2 favors adsorbed on tertiary amine/ amide rather than primary and secondary ones. The higher DMF content could enhance SO2 adsorbability. The condition ranges of using 3%wt of DMF loading, initial concentration of SO2 in synthetic waste gas less than 120 ppm, and room temperature up to 60oC provided the optimal adsorption capacity toward SO2. The regeneration of adsorbent performed completely at moderate temperature of 200oC. DMF-RM showed 4% capacity declination after 8 cycles consecutively uses.
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