Gallium oxide impregnated on porous clay heterostructures material for selective catalytic reduction of nitrogen oxide with C3H6

Abstract

Abstract The porous clay heterostructures (PCHs) were used as a carrier for gallium oxide-based catalyst to convert the nitrogen oxide (NO) to N2 with C3H6. The ICP, N2 physisorption, XRD, SEM, XPS, UV-vis and Py-FTIR tests were applied to study the physicochemical properties and the selective catalytic reduction of NO was evaluated in a fixed-bed reactor by C3H6. The catalysts with different Ga loading, i.e., 7, 13, 24 and 32 wt% were tested and the best catalytic activity was achieved at 24 wt% Ga-PCH, which exhibits 90% NOx conversion at 350 °C, strong thermal stability and better resistance to H2O and SO2. Further, the NOx conversion test demonstrated that adding a small concentration of gallium oxide on porous clay support improves the catalytic efficiency by increasing the acidic concentration and amorphous formation that is beneficial for the conversion of nitrogen oxide (NO) at low temperatures. Meanwhile, the increase of gallium content might be a reason for the agglomeration of Ga2O3 molecules and blockage of Porous Clay Heterostructures (PCHs) support pores.