Abstract
LaCoO3 perovskites prepared by the molten-salt method (LaCoO3-M), the sol–gel method (LaCoO3-S), and the co-precipitation (LaCoO3-C) method were systematically characterized and its simultaneous oxidation abilities for NO and Hg0 in flue gas were investigated. Although the LaCoO3 perovskites were prepared successfully by the three different preparation methods, the simultaneous oxidation abilities for NO and Hg0 were of great difference. The preparation methods had a strong influence for LaCoO3 perovskites on surface area, Co3+ content, adsorbed oxygen, and low-temperature reducibility (below 400 °C) and from the highest to the lowest value were LaCoO3-M > LaCoO3-C > LaCoO3-S, which was in good agreement with the simultaneous oxidation abilities for NO and Hg0. Furthermore, it was found from XPS and in situ DRIFTS that the oxidation products of Hg0 were all HgO species, not Hg(NO3)2 species, and the intermediate oxidation products of NO were also different, but all subsequently formed NO2. In conclusion, the selection of preparation method is a key parameter for optimizing the catalytic activity on perovskite.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.