Applied Surface Science, Vol.481, 1277-1286, 2019
Influence of calcination temperature on the catalytic properties of LaCu0.25Co0.75O3 catalysts in NOx reduction
The present research is designed to analyze the effect of different calcination temperature on the structural property, the redox ability and the catalytic behavior of LaCu0.25Co0.75O3 samples in NO + CO reaction. The appropriate elevation of calcination temperature visibly enhances the catalytic behavior of LaCu0.25Co0.75O3 samples, conforming to the sequence: LaCu0.25Co0.75O3-750 > LaCu0.25Co0.75O3-500 > LaCu0.25Co0.75O3-250 > LaCu0.25Co0.75O3-1000. The greatest catalytic behavior is gathered on LaCu0.25Co0.75O3-750 sample at 350 degrees C, with 97% N-2 selectivity and 100% conversion for reactants. At the same time, LaCu0.25Co0.75O3-750 sample shows the superior continuous catalysis resistance. The ratio of Cu+/(Cu+ +Cu2+) and Co2+/(Co2+ + Co3+), the reducing ability and quantity of oxygen deficiencies are regarded as the key points for the enhancement of catalytic behavior. Besides, giving the example of LaCu0.25Co0.75O3-750, all the catalytic steps are provided to deeply explore the catalytic mechanism.