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• W3204696231 endingPage "132660" @default.
• W3204696231 startingPage "132660" @default.
• W3204696231 abstract "• Sigle-atom Co catalysts were successfully synthesized by a pyrolysis treatment. • Sigle Co atoms mainly coordinate with N and stay in CoN 2 . • CoN 2 has a much higher oxygen adsorption energy compared to Co 3 O 4 . • The Hg 0 oxidation activity of Co 2.5 -SAs@NC is about 100% even at 60 °C. Oxidation of Hg 0 to Hg 2+ is considered to be a promising method to remove Hg 0 from flue gas. Chemisorbed oxygen on catalyst surface is the main active site during Hg 0 oxidation process. Thus, how to efficiently activate gaseous oxygen forming more chemisorbed oxygen is a big challenge in this field. Inspired by this, metal Co based catalysts with an aggregation state of single Co atoms were prepared by pyrolysis of the redesigned bimetallic Zn/Co metal–organic frameworks precursor. SEM, TEM, HR-TEM and XRD results show that the catalysts have a high Co dispersion degree with lower Co doping content. HAADF-STEM has confirmed that Co 2.5 -SAs@NC (NC stands for nitrogen-doped carbon) has the aggregation state of single Co atoms. EXAFS results show that single Co atoms mainly coordinate with N and stay in Co-N 2 . Furthermore, DFT results determine that the adsorption energy of O 2 on Co-N 2 is much higher than that on the surface of traditional metal oxide catalyst Co 3 O 4 . It means single Co atoms have a better ability of transforming gaseous oxygen into chemisorbed oxygen. Thanks to the highly coordinated unsaturated state of single Co atoms and the better ability of transforming gaseous oxygen into chemisorbed oxygen, Co 2.5 -SAs@NC gains an excellent Hg 0 oxidation efficiency of near 100% at high GHSV of 180, 000 h −1 even at a low temperature of 60 °C. With these advantages, Co 2.5 -SAs@NC appears to be a promising catalyst for Hg 0 oxidation from flue gas." @default.
• W3204696231 created "2021-10-11" @default.
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• W3204696231 date "2022-01-01" @default.
• W3204696231 modified "2023-10-16" @default.
• W3204696231 title "Single-atom Co-N-C catalyst for efficient Hg0 oxidation at low temperature" @default.
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• W3204696231 doi "https://doi.org/10.1016/j.cej.2021.132660" @default.
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