Study On Catalytic Reduction Of NO By Propane Over The H-beta Based Catalysts

The selective catalytic reduction (SCR) of NO_X represents the simplest and most attractive solution for NO_X removal. However, although extensive efforts have been made to improve this method, there are still many problems unresolved. After nearly 10 years 'development, zeolite-based catalysts such as zeolite-based Cu-, Co-, In-, Ce-, Pt- or Pd- catalysts are of more advantage for selective catalytic reduction of NO_X, which are sensitive to the reaction condition, for instance SO₂, H₂O, GHSV and so on. For the above consideration, we investigated the effects of second additives on Co/H-beta and Ag/H-beta catalysts respectively in this dissertation. The influence of the cooperating agents was studied on the activity of catalysts for C₃H₈-SCR in different reaction condition, which furthermore could combine with the catalyst structure.We chose cheaper metal Zn as cooperating agents for Co/H-beta. The effect of Zn addition was investigated on the activity of Co- /H-beta catalysts for C3H8-SCR at high GHSV. Moreover, the strong interaction between these two metal oxides was studied.The Ag-Mn/H-beta catalysts were used H-beta zeolite as support which displaying a promising activity for SCR of NO. The effect of MgO addition on SO₂ tolerance of Ag/H-beta for C₃H₈-SCR was investigated at low temperature. In addition, attention was paid to the effect of Ag and Mn loading on the catalytic performance and the physico-chemical characteristics of Ag-Mn/H-beta. We observed a better catalytic activity of Ag-Mn/H-beta for SCR of NO_X at low temperature.