Abstract:

The clay pillared by multi-oligomeric hydroxyl cation was used to synthesize Zr-RE-PILC (RE = Ce , La ,Y) supports , and was treated by SO₄^2-. Then , Cu-based pillared clay catalyst Cu/Zr-RE-PILC with a Cu massfraction of 3% was prepared by means of impregnation. Moreover , the catalytic performance of Cu/Zr-RE-PILC for the selective reduction of NO by propylene in the presence of Ce , La and Y was investigated in a micro reactor.XRD was finally adopted to characterize the catalyst. The results indicate that both the catalytic activity for the selective reduction of NO and the thermal stability of the supports at a high temperature can be improved by introducing Ce in the catalyst , that Zr-Ce-PILC support with excellent thermal stability can be synthesized in a Zr/ Ce ratio ( molar ratio) of 5 at an aging temperature of 65 "C and a calcination temperature of 500 ℃ , and that , when the
feed composition is 0. 22% NO-0.15% C₃ H₆2% O₂ -97.63% He and the space velocity is 50000 mL/ (h•g)  , the NO conversion reaches 65% at a reaction temperature of 300℃, and reaches 22.5% even at a reaction temperature of 500℃ over Cu/Zr-Ce-PILC catalyst.

Key words: rare earth metal, cerium, pillared clay catalyst, nitrogen oxide, selective reduction