Catalytic conversion of CO, NO and SO2 on the supported sulfide catalyst: I. Catalytic reduction of SO2 by CO

Abstract

Catalytic reduction of SO2 to elemental sulfur by CO has been systematically investigated over γ-Al2O3-supported sulfide catalysts of transition metals including Co, Mo, Fe, CoMo and FeMo with different loadings of the metals. The sulfided CoMo/Al2O3 exhibited outstanding activity: a complete conversion of SO2 was achieved at a temperature of 300°C. The reaction proceeds catalytically and consistently over time and most efficiently at a molar feed ratio CO/SO2=2. A precursor CoMo/Al2O3 oxide which experienced sulfurization through the CO–SO2 reaction yielded a working sulfide catalyst having a yet lower activity than the CoMo catalyst sulfided before reaction (pre-sulfiding). The catalytic activity of various metal sulfides decreased in order of 4% Co 16% Mo>4% Fe15% Mo>16% Mo≥25% Mo>14% Co≥4% Co>4% Fe. A DRIFT study showed that CO adsorbs exclusively on CoMo phase and that SO2 predominantly on γ-Al2O3. It is suggested that the Co–Mo–S structure is more adequate than the other metal-sulfur structures for the formation of a carbonyl sulfide (COS) intermediate because of the proper strength of metal–sulfur bond, and catalytically works with γ-Al2O3 for the COS–SO2 reaction.