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Adjacent iron sites enable methane conversion to ethanol

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Research area:chemistry-materials

What the study found

The study found that a catalyst with adjacent iron sites can steer methane conversion toward ethanol. The catalyst achieved ethanol production from methane at 25 °C and 0.5 MPa, with high selectivity reported in the abstract.

Why the authors say this matters

The authors say this matters because selective oxidation of methane to C2 oxygenates, meaning two-carbon oxygen-containing products, under mild conditions is important for methane valorization. They also note that the process is difficult because methane is inert, overoxidation competes, and carbon-carbon coupling is slow.

What the researchers tested

The researchers tested an N,S co-doped carbon nanotube-supported Fe5 cluster catalyst, called Fe5/NSC. They combined experimental investigation with density functional theory calculations to examine how adjacent iron sites affect methane activation and coupling steps.

What worked and what didn't

The catalyst produced ethanol with a productivity of 1939.6 μmol·gcat–1·h–1 and a selectivity of 83.9% under the stated conditions, without added CO. The abstract says adjacent iron sites favor sequential C–H activation and C–C coupling through distinct C1 intermediates, *OCH2 and *CH3, leading to CH3CH2O* and then ethanol. In contrast, the conventional CHx–CO coupling pathway is described as primarily yielding acetic acid.

What to keep in mind

The summary provided does not describe detailed experimental limitations or broader scope beyond the reported conditions. The findings are specific to the Fe5/NSC catalyst and the methane-to-ethanol conversion route described in the abstract.

Key points

  • A nitrogen- and sulfur-doped carbon nanotube-supported Fe5 cluster catalyst converted methane to ethanol.
  • The abstract reports ethanol productivity of 1939.6 μmol·gcat–1·h–1 and selectivity of 83.9% at 25 °C and 0.5 MPa CH4.
  • The authors say adjacent iron sites enable sequential C–H activation and C–C coupling.
  • Experimental work and density functional theory calculations were used to study the mechanism.
  • The abstract contrasts the ethanol-forming route with conventional CHx–CO coupling, which primarily yields acetic acid.

Disclosure

Research title:
Adjacent iron sites enable methane conversion to ethanol
Authors:
Wentao Hao, Zi Wang, Hui Cao, Jia Qiao, Qingde Zhang, Kun Xiong, Xingchen Liu, Yong Qin, Chaoqiu Chen
Institutions:
Institute of Coal Chemistry, Institute of Coal Chemistry, Institute of Coal Chemistry, Institute of Coal Chemistry, Institute of Coal Chemistry, Institute of Coal Chemistry, Institute of Coal Chemistry, Institute of Coal Chemistry, Qingdao University of Science and Technology, Southwest University of Science and Technology, Southwest University of Science and Technology, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences
Publication date:
2026-07-03
DOI:
10.1021/acscatal.6c00933
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

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