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

preprint
submitted on 25.07.2020 and posted on 27.07.2020 by Lanlan Sun, Yu Wang, Chuanming Wang, Zaiku Xie, Naijia Guan, Landong Li

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/molCu/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 Cu2+-Cu+-Cu2+ 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.

Funding

National Natural Science Fund of China (21722303, 21673295, 21421001)

111 Project (B12015, B18030)

History

Email Address of Submitting Author

lild@nankai.edu.cn

Institution

Nankai University

Country

China

ORCID For Submitting Author

0000-0003-0998-4061

Declaration of Conflict of Interest

The authors declare no competing financial interests

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