A series of pervoskite-type oxides,La1-xKxCoO3 complex catalysts,with nanometric size were synthesized with low temperature through a combustion process.The catalysts were characterized for crystal structure and chemical composition using H2-TPR,XRD,BET and chemical analysis.The catalytic activities in simultaneous removal of NOx and soot from diesel exhaust were evaluated via temperature programmed oxidation(TPO) equipment,and the effluents of crystal structure and chemical composition on the catalytic act...