Influence of preparation methods on the structure and catalytic performance of nanostructured La۰.۷Ba۰.۳Co۰.۳Ni۰.۷O۳ for CO oxidation

چکیده مقاله

Nano-perovskite oxides La0.7Ba0.3Co0.3Ni0.7O3 were synthesized by the co-precipitation and polymerized complex route based on the Pechini process methods (denoted as LBCN-Cop and LBCN-P, respectively) and employed in the removal of carbon monoxide (CO) from (N2 ? CO ? O2) gas mixture through oxidation. In this paper, the effect of the preparation method on the catalytic activity of nanocatalysts is discussed. The catalysts were characterized by XRD, FTIR, BET, TPR, SEM and EDX techniques. The specific surface area of the prepared catalysts varied from 24.55 (LBCN-Cop) to 34.14 (LBCN-P) m2 g-1. SEM investigations revealed that the LBCN-P nanoparticles were uniform spheres in shape with diameters ranging from 50 to 60 nm, whereas more agglomeration of particles was found for the LBCN-Cop catalyst. The results of catalytic activity measurements showed the superiority of the catalyst sample prepared by the Pechini method for CO oxidation at low temperatures compared with that prepared by the coprecipitation method.