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In-situ synthesis of monodispersed Cu_xO heterostructure on porous carbon monolith for exceptional removal of gaseous Hg⁰

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Zhang, Liyuan
Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Zhang, L., Yang, S., Lai, Y., Liu, H., Fan, Y., Liu, C., et al. (2020). In-situ synthesis of monodispersed Cu_xO heterostructure on porous carbon monolith for exceptional removal of gaseous Hg⁰. Applied Catalysis B: Environmental, 265: 118556. doi:10.1016/j.apcatb.2019.118556.

Abstract

Gaseous Hg⁰ is one of the most deadly and hard-to-dispose pollutants. The oxidation of Hg⁰ is a promising route, but the rational design and synthesis of highly efficient catalysts still remain grand challenges. Herein, CuO@Cu₂O (or Cu_xO) heterostructured nanoparticles uniformly monodispersing on porous carbon monolith were designed and successfully synthesized using oligo(m-phenylenediamine)-Cu²⁺ complex as raw material. The Cu_xO-carbon catalyst contains ∼28 wt% of Cu. Based on density functional theory calculation, the CuO@Cu₂O junction interfaces can accelerate the Hg⁰ oxidation by significantly reducing the energy barriers of reaction. Only 1 mg of the catalyst can catalyze the oxidation of more than 90 % of Hg⁰ with [HCl] = 0.5 ppm, [O₂] = 6 vol%, T = 150 °C. The poisoning effect of either SO₂ or H₂O on the catalysts is weak. Moreover, a long-term test confirmed that the Hg⁰ oxidation rate can maintain more than 90 % even in the co-presence of SO₂ (5000 ppm) and H₂O (10 vol%).