Study of A-and B-Substituted Perovskite CDPF Catalyst and Its' Catalytic Activity

【摘要】：A-and B-substituted perovskite catalyst for CPDF,La_(0.6)K_(0.4)CoO_3 and LaCo_(0.8)Fe_(0.2)O_3 were prepared by citric method.Morphology,components and structure of catalyst were characterized by Scanning Electron Microscope(SEM),Energy Dispersive Spectrometer(EDS)and X-ray diffraction(XRD).The catalytic activity of catalyst on soot combustion was determined by Thermogravimetry(TG).Results show that the catalyst had good catalytic performance.The ignition temperature of model soot was 342℃when mixed with A-substituted perovskite catalyst La_(0.6)K_(0.4)CoO_3 and 377℃with B-substituted perovskite catalyst LaCo_(0.8)Fe_(0.2)O_3,while 595℃of model soot without catalyst.The catalytic activity can be attributed to the catalyst endowed model soot with lower combustion activation energy.Therefore,these substituted perovskites may be good candidates of noble metal for CPDF.