摘要
应用混合法、络合法合成了LaCoO_3,LaMnO_3,La_2Cu_(0.9)Zr_(0.1)O_4,考察了它们对CO的催化氧化活性,发现氧化活性顺序为:LaCoO_3(络合法)>LaCoO_3(混合法)>>LaMnO_3(混合法)>La_2Cu_(0.9)Zr_(0.1)O_4(混合法)。同时发现预氧化能提高LaCoO_3的高温氧化活性,预还原能提高LaCoO_3的低温氧化活性。在实验室模拟汽车尾气条件下LaCoO_3具有优良的CO氧化活性,起燃温度T_(50％)=227℃。
Synthesized by means of mixing/complexing method as presented, the RE catalysts LaCoO3 ,LaMnO3 and La2Cu0.9Zr0.1O4 were examined for their catalysis-oxidation activities to CO. It was found that their oxidation activities are in such a sequence that LaCoO3(by complexing)>LaCoO3 (by mixing) >>LaMnO3 (by mixing)>La2Cu0,9Zr0.1O4 (by mixing) , and that the oxidation activity of LaCoO3 can be raised by preoxidation at high temperature or by prereduction at low temperature.LaCoO3 was proved having an excellent oxidation activity to CO with an ignition temperature T50%227℃ under conditions of simulating car's gas remnant in laboratory.
关键词
催化剂
钙钛矿型
稀土
尾气净化
perovskite type, catalyst,gas remnant control,rare earth.
