Influence of preparation methods on the structure and catalytic performance of nanostructured La 0.7 Ba 0.3 Co 0.3 Ni 0.7 O 3 for CO oxidation Bahareh Niknahad 1 • Mohsen Mohsennia 1,2 • Ali Eliassi 3 Received: 17 August 2015 / Accepted: 4 December 2015 Ó Akade ´miai Kiado ´, Budapest, Hungary 2015 Abstract Nano-perovskite oxides La 0.7 Ba 0.3 Co 0.3 Ni 0.7 O 3 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 (N 2 ? CO ? O 2 ) 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) m 2 g -1 . SEM inves- tigations 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 measure- ments showed the superiority of the catalyst sample prepared by the Pechini method for CO oxidation at low temperatures compared with that prepared by the co- precipitation method. Keywords CO oxidation Á Nanocatalyst Á Pechini method Á Co-precipitation Á Perovskite-type oxide & Mohsen Mohsennia moh.moh@cheme.caltech.edu; m.mohsennia@kashanu.ac.ir 1 Department of Chemistry, University of Kashan, 8731751167 Kashan, Iran 2 Institute of Nanoscience and Nanotechnology, University of Kashan, 8731751167 Kashan, Iran 3 Department of Chemical Industries Research, Iranian Research Organization for Science and Technology, 3353136846 Tehran, Iran 123 Reac Kinet Mech Cat DOI 10.1007/s11144-015-0965-6