A simple co-nanocasting method to synthesize high surface area mesoporous LaCoO3 oxides for CO and NO oxidations

High surface area mesoporous LaCoO3 oxides (270 m(2) g(-1)) with well crystallized perovskite framework have been successfully prepared via a simple one-step co-nanocasting method using the mesoporous SiO2 (KIT-6) template. The prepared mesoporous LaCoO3 material shows relatively high catalytic activity for CO oxidation and the complete CO conversion has been achieved at about 190 degrees C, which is about 75 degrees C lower than that of the non-mesoporous LaCoO3. Moreover, compared with non-mesoporous counterpart, the prepared mesoporous LaCoO3 possesses much higher catalytic activity for NO oxidation, showing rather higher NO,, storage capacity. The NO removal ratio is high up to 64% under low temperature (310 degrees C). The enhanced catalytic activity of the mesoporous LaCoO3 for CO and NO oxidation is attributed to its high surface area and crystal lattice defects. A catalytic mechanism of CO and NO oxidation was proposed. (c) 2013 Elsevier Inc. All rights reserved.