Complete oxidation of methane and CO at low temperature over LaCoO3 prepared by spray-freezing/freeze-drying method

Perovskite-type LaCoO3 oxides were prepared by spray-freezing/freeze-drying method using citrate precursor. The calcination temperature for a single phase of LaCoO3 could be lowered to 500 °C without formation of any other oxides and the product had the highest surface area of 23.7 m2/g. Below 500 °C, this catalyst with the perovskite structure and the high surface area showed higher activity for complete oxidation of low concentration methane (2000 ppm) and CO (1%) compared to Pt/Al2O3 catalyst.