Ship diesel engine exhaust emission is one of the dominant sources of global air pollution. The top two primary pollutants in the emission are nitrogen oxides (NOx) and particulate matter (PM). These pollutants pose a strong environmental threat with an increased risk to human health. Diesel particulate filters (DPF) is the only way to effectively control particulate emissions from diesel engines especially in marine ships. As one of the most promising technologies for passive regeneration of DPF in ship exhaust, catalytic oxidation technology is also an important research topic in the field of catalytic combustion of soot emitted by diesel engines. Perovskite catalysts play a dual role in the oxidation of soot particles and NOx reduction because of their low cost, high thermal stability and flexible structure. However, at present, there is a lack of in-depth study on the synergistic mechanism between B-cation and oxygen vacancy. In addition, the role of these active sites on perovskite surfaces in the catalytic combustion of soot is still unclear.
Recently, an economical and efficient oxidized perovskite catalyst LaAgCoO3 was designed and synthesized by the Professor Liu Qingling and his team from the School of Environmental Science and Engineering, Tianjin University (http://catalysis.tju.edu.cn/). This work studied the effect of Ag+ doping on oxygen vacancy and the correlation between oxygen vacancy and active site changes, and revealed the activity evolution of oxygen vacancies in perovskite. Moreover, the interaction mechanism between oxygen vacancies and adjacent metal sites was explained. Finally, proposed the cyclic redox mechanism of NO assisted soot oxidation over LaAgCoO3 catalyst, which provided a research basis for the rational design of high-performance perovskite oxidation catalysts.
Related research results "Promotion of A-site Ag Doped Perovskite for the Catalytic Oxidation of Soot: Synergistic Catalytic Effect of Dual Active Sites " have been accepted by the international high-level journal ACS CATALYSIS (IF: 13.084). The first author of the article is He Lijun, and the School of Environmental Science and Engineering of Tianjin University is the first signing unit.
Professor Liu Qingling’s team has long been committed to research in the field of air pollution control, and has achieved a series of research results in the treatment of volatile organic compounds and mobile source exhaust emissions. In the past five years, more than 40 papers have been published in the following international journals: Environmental Science & Technology, Applied Catalysis B: Environmental, Chemical Engineering Journal, Langmuir, Applied Catalysis A: General, Green Chemistry, Ultrasonic Sonochemistry, Applied Surface Science, Journal of Chemical Technology and Biotechnology, Chemosphere, ChemCatChem.
By: School of Environmental Science and Engineering
Editor: Qin Mian
