Water-Involved Methane Selective Catalytic Oxidation by Dioxygen over Copper-Zeolites

Authors:
  • LSLanlan Sun
    Lanlan Sun
  • YWYu Wang
    Yu Wang
  • CWChuanming Wang
    Chuanming Wang
  • ZXZaiku Xie
    Zaiku Xie
  • NGNaijia Guan
    Naijia Guan
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Abstract
The selective oxidation of methane to methanol is a dream reaction of direct methane functionalization, which remains a key challenge in catalysis and a hot issue of controversy. Herein, we report the water-involved methane selective catalytic oxidation by dioxygen over copper-zeolites. At 573 K, a state-of-the-art methanol space-time yield of 543 mmol/mol Cu /h with methanol selectivity of 91 % is achieved with Cu-CHA catalyst. Temperature-programmed surface reactions with isotope labelling determine water as the dominating oxygen and hydrogen source of hydroxyl in methanol while dioxygen participates in the reaction through reducing to water. Spectroscopic analyses reveal the fast redox cycle of Cu 2+ -Cu + -Cu 2+ during methane selective oxidation, which is closely related to the high catalytic activity of Cu-CHA. Density functional theory calculations suggest that both CuOH monomer and dimer in Cu-CHA can catalyze the selective oxidation of methane to methanol with Cu-OOH as the key reaction intermediate, and meanwhile, various copper sites undergo interconversion under reaction conditions.
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