Sulphur trap materials based on mesoporous Al2O3

Abstract Different sulphur trap materials based on mesoporous Al 2 O 3 supports modified with the storage component Ca or Ba and the oxidation components Pt or Cu or Mn were prepared and the SO 2 uptake behaviour examined in the temperature range 50–600 °C. A comparison between the different oxidation components shows that the presence of Pt is not a necessary precondition for attaining a good storage behaviour under these test conditions. Mn is the most suitable oxidation component. Tests performed over four temperature cycles show that the removal efficiency for SO 2 gradually decreases over the course of temperature cycles. Moreover, a progressive diminution of the SO 2 uptake is observed especially in the lower temperature range during the temperature cycles. A further modification with Na prevents this drawback. Especially a distinct improvement is observed with the Ca-containing material. It stored 22 wt.% sulphate during the four temperature cycles. This material is regarded as being most suitable for application as sulphur trap material.