Experimental study on selective catalytic reduction of NO with propene over iron based catalysts supported on aluminum pillared clays

Iron based catalysts supported on aluminum pillared clays (Fe/Al-PILC) was prepared by impregnation method and the selective catalytic reduction of NO with propene by the Fe/Al-PILC catalysts was investigated in a fixed bed reactor. The physical and chemical properties of the catalysts were characterized by N₂ adsorption/desorption, XRD, H₂-TPR, Uv-vis, Py-FTIR, etc. Results showed that 9% Fe/Al-PILC reduced more than 98% of NO at 400-550℃. SO₂ and water vapor slightly influenced the catalytic activity of the catalysts. XRD and N₂ adsorption/desorption characterization results revealed that the iron oxides in the catalyst were highly dispersed on the surface of the carrier, and the catalyst has a large specific surface area and pore volume. H₂-TPR results indicated that the activity of the catalysts was mainly determined by the reduction performance of Fe₂O₃ phase. Uv-vis results showed that the activity of the catalysts was positively correlated with the iron oxide oligomer Fe_xO_y. Py-FTIR results indicated that both Lewis acid and Brønsted acid were formed on the catalyst surface and the Lewis acid sites were the main catalytic activity center of NO and C₃H₆ reaction.