Nâng cao hoạt tính xúc tác của perovskit La0,4Sr0,6CoO3 đối với phản ứng DeNOx bằng cách pha tạp ion bạc.

Abstract

Mixed oxides of La, Sr, Co and Ag were prepared by sol-gel method using acid citrat as solvent. Two kinds of obtained mixed oxides A = La_1-xSr_xCoO₃+La₂O₃+SrO+Co₃O₄+ SrCoOx and B = A+Ag were characterizied by X-Ray Diffraction analysis (XRD), Field Emision Scanning Electron Microscope (FESEM), Energy Dispersive X-ray Spectroscopy (EDS). Their catalytic activity was studied by Temperature Programmed Surface Reaction (TPSR). The results shown that the mixed oxide A exhibits a weak DeNOx activity, but in the addition of a little of metal silver (Ag), the NOx conversion increases remakably from 29.4% (in absence Ag) to 82.4% at 220^oC.