Desulfurization of odorant-containing gas: Removal of t-butylmercaptan on Cu/ZnO/Al 2O 3

Abstract

The removal of t-butylmercaptan (TBM) from gas fuel has been investigated by using sorption. The sorbents, Cu/Al 2O 3, ZnO/Al 2O 3 and Cu/ZnO/Al 2O 3, were prepared by co-precipitation method. As the sorption temperature increased to 250 ∘ C , the sorption capacity of TBM on Cu/ZnO/Al 2O 3 increased up to 8.84 mmol/g, and then decreased. In the comparison of sorbents, the order of sorption capacity was Cu / ZnO / Al 2 O 3 > Cu / Al 2 O 3 > ZnO / Al 2 O 3 indicating the increase of that under co-existence of Cu and ZnO. The maximum crystallinity of CuS and ZnS was showed after the sorption of TBM at 250 ∘ C using Cu/ZnO/Al 2O 3. The increased crystallinity of CuS and ZnS resulted in decreases in surface areas. The results imply that the sulfur compound is decomposed by both Cu and ZnO and subsequently S was bound to Cu and Zn.