A comparative study of LaCoO3 and LaCo0.3Zn0.7O3 perovskite-type nanocatalysts for carbon monoxide emission control

The nanostructured LaCoO3 and LaCo0.3Zn0.7O3 perovskite-type catalysts were synthesized by the polymerized complex method based on the Pechini process. The prepared catalysts were characterized by XRD and SEM and their catalytic activity was evaluated in the CO oxidation reaction. The SEM pictures of the synthesized nanocatalysts showed that the particles sizes were close to 100 nm. According to the obtained results, the synthesized LaCoO3 nanocatalyst showed a superior performance as compared to the LaCo0.3Zn0.7O3 nanocatalyst, however, for both nanocatalysts, the conversion of CO increased with increasing reaction temperature. The catalytic activity of the prepared nanocatalysts was measured at different temperatures from 100 to 400°C with an inlet gas mixture containing 95% N2, 1% CO and 4% O2. The effect of temperature and gas hourly space velocity (GHSV) was investigated. According to the results of catalytic activity measurements, although the both nanocatalysts showed nearly complete CO conversion at 400°C, LaCoO3 depicted a superior catalytic activity and can be considered as a potential candidate for developing catalytic converters to remove carbon monoxide from automobile exhaust gas

کلیدواژه ها:

Perovskite-type oxide ، Nanostructured catalyst ، CO oxidation ، polymerized complex method