Experimental studies on SOx removal over amine/amide modified MCM-41

Amine/amide-support mesoporous material has been proven to enhance the acidic gas uptake. Herein, MCM-41 synthesized from rice-husk (RM) was employed as a molecular sieve supporter for dynamic SO2 adsorption. Four species of classified amine/amide including urea (U), monoethanolamine (MEA), tetraethanolamine (TETA), and dimethylformamide (DMF) were comparatively impregnated with RM. The SO2 adsorption was carried out in a fixed bed column at 42,000 h-1 WHSV. DMF impregnated RM (DMF-RM) provides higher uptake capacity than other impregnated RMs. The SO2 favors to be 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 60 ํC provided the optimal adsorption capacity toward SO2. DMF-RM showed 4% capacity declination after 8 cycles consecutively uses.