Catalysis Today, Vol.149, No.1-2, 138-142, 2010
Deep desulfurization of model gasoline by selective adsorption on Ag+/Al-MSU-S
The desulfurization of model gasoline containing 600 ppmw thiophene or dibenzothiophene (DBT) by selective adsorption over Ag+ exchanged mesoporous material Al-MSU-S was studied in a fixed adsorbent bed at ambient temperature and pressure. The results showed chat the sulfur capacity increased with Al content incorporated in the silicate framework and Ag+ exchange can effectively improve the desulfurization performance. The best adsorbent, Ag+/20%Al-MSU-S, has adsorption capacity of 5 or 20 ml model gasoline containing thiophene or DBT per gram adsorbent, respectively, before the detection limit in our experiments, as a result of pi-complexation. The adsorbent can be regenerated more than six times by simple calcination in air at 350 degrees C without obvious losing the Sulfur adsorption capacity. (C) 2009 Elsevier B.V. All rights reserved.
Keywords:Selective desulfurization;Model gasoline;Thiophene;Dibenzothiophene;Ag+/Al-MSU-S;pi-Complexation