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<p>Photocatalytic oxidative coupling of methane (POCM) enables the production of value-added fuels and chemicals using renewable solar energy. Unfortunately, despite recent advances in the production of C<sub>2</sub> chemicals (for example, ethane), POCM systems that selectively produce industrially useful and transportable C<sub>3</sub>+ hydrocarbons remain elusive. Here we report that Au-embedded porous TiO<sub>2</sub>, activated by steam during the POCM process, enables efficient and selective flow synthesis of propane with a productivity of 1.4 mmol h<sup>−1</sup>. At this productivity, we achieve a high propane selectivity of 91.3% and an apparent quantum efficiency of 39.7% at a wavelength of 365 nm. Mechanistic studies reveal that the tensile-strained Au and the nanopore-confined catalytic microenvironment jointly stabilize key ethane intermediates, boosting deeper C<sub>2</sub>–C<sub>1</sub> coupling to form propane. Meanwhile, the steam-activated surface lattice oxygen on TiO<sub>2</sub> accelerates hydrogen species transfer, thus enhancing POCM kinetics. This approach is economically feasible for practical application under concentrated solar light.</p>

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Photocatalytic oxidative coupling of methane to C3+ hydrocarbons via nanopore-confined microenvironments

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Wenfeng Nie,
  • Liwei Chen,
  • Yuchen Hao,
  • Xiangjie Ge,
  • Haodong Liu,
  • Jiani Li,
  • Jialin Wang,
  • Zhao Wang,
  • Hui-Zi Huang,
  • Chao Sun,
  • Cuncai Lv,
  • Shangbo Ning,
  • Linjie Gao,
  • Yaguang Li,
  • Shufang Wang,
  • Bo Wang,
  • Jinhua Ye

摘要

Photocatalytic oxidative coupling of methane (POCM) enables the production of value-added fuels and chemicals using renewable solar energy. Unfortunately, despite recent advances in the production of C2 chemicals (for example, ethane), POCM systems that selectively produce industrially useful and transportable C3+ hydrocarbons remain elusive. Here we report that Au-embedded porous TiO2, activated by steam during the POCM process, enables efficient and selective flow synthesis of propane with a productivity of 1.4 mmol h−1. At this productivity, we achieve a high propane selectivity of 91.3% and an apparent quantum efficiency of 39.7% at a wavelength of 365 nm. Mechanistic studies reveal that the tensile-strained Au and the nanopore-confined catalytic microenvironment jointly stabilize key ethane intermediates, boosting deeper C2–C1 coupling to form propane. Meanwhile, the steam-activated surface lattice oxygen on TiO2 accelerates hydrogen species transfer, thus enhancing POCM kinetics. This approach is economically feasible for practical application under concentrated solar light.