Soot Oxidation Studies on SrMn_(0.98)B_(0.02)O3(B-Fe,Ni)Perovskites

摘要

In this paper,the performance of SrMn_(0.98)B_(0.02)O3(B = Fe,Ni)perovskites was evaluated for catalytic soot oxidation applications.All the samples exhibited a nano-crystalline hexagonal structure(XRD analysis)with the crystal sizes ranges 30 to 46 nm.XPS analysis reveals the presence of multiple valence states of Ni cations(Ni~(2+)/Ni~(3+))and Mn cations(Mn~(4+)/Mn~(3+))cations with the divalent strontium and trivalent iron cation on the surface of the perovskites.O2-TPD analysis infers that the sample SrMn_(0.98)Ni_(0.02)O3 showed the highest quantity of surface adsorbed oxygen molecules(78.87 μmol.g~(-1))followed by SrMnO3 sample(72.16 μmol.g~(-1)).Furthermore,the soot-TPR analysis confirms that the sample SrMno.9gNio.02O3 shown the higher catalytic activity than SrMno.98Fe0.o203due to synergetic effect between Mn-Ni cations,the higher reducibility tendency of the metal ions and the higher quantity of active oxygen species initiated the structural defects in the catalysts.The superior catalytic activity of soot oxidation of the as-synthesized samples was observed in the order of SrMn_(0.98)Ni_(0.02)O3> SrMn_(0.98)Fe_(0.02)O3>SrMnO3>bare soot.