PdCu nanoalloy decorated photocatalysts for efficient and selective oxidative coupling of methane in flow reactors

Xiyi Li, Chao Wang, Jianlong Yang, Youxun Xu, Yi Yang, Jiaguo Yu, Juan J. Delgado, Natalia Martsinovich, Xiao Sun, Xu-Sheng Zheng, Weixin Huang and Junwang Tang ()
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Xiyi Li: University College London
Chao Wang: University College London
Jianlong Yang: Northwest University
Youxun Xu: University College London
Yi Yang: Wuhan University of Technology
Jiaguo Yu: China University of Geosciences
Juan J. Delgado: Universidad de Cádiz, Campus Rio San Pedro
Natalia Martsinovich: University of Sheffield
Xiao Sun: University of Science and Technology of China
Xu-Sheng Zheng: University of Science and Technology of China
Weixin Huang: University of Science and Technology of China
Junwang Tang: University College London

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Methane activation by photocatalysis is one of the promising sustainable technologies for chemical synthesis. However, the current efficiency and stability of the process are moderate. Herein, a PdCu nanoalloy (~2.3 nm) was decorated on TiO2, which works for the efficient, stable, and selective photocatalytic oxidative coupling of methane at room temperature. A high methane conversion rate of 2480 μmol g−1 h−1 to C2 with an apparent quantum efficiency of ~8.4% has been achieved. More importantly, the photocatalyst exhibits the turnover frequency and turnover number of 116 h−1 and 12,642 with respect to PdCu, representing a record among all the photocatalytic processes (λ > 300 nm) operated at room temperature, together with a long stability of over 112 hours. The nanoalloy works as a hole acceptor, in which Pd softens and weakens C-H bond in methane and Cu decreases the adsorption energy of C2 products, leading to the high efficiency and long-time stability.

Date: 2023
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DOI: 10.1038/s41467-023-41996-y

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