Low Temperature Oxidation of Ethane to Oxygenates by Oxygen over Iridium-Cluster Catalysts

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Abstract
Directly selective oxidation of light alkanes, such as ethane, into value-added chemical products under mild reaction conditions re-mains a challenge in both industry and academia. Herein, the iridi-um cluster and atomically dispersed iridium catalysts have been successfully fabricated using nanodiamond as support. The ob-tained iridium cluster catalyst shows remarkable performance for selective oxidation of ethane under oxygen at 100oC, with an initial activity as high as 7567 mmol/molmetal/h and a selectivity to acetic acid higher than 70% after five in-situ recycles. The presence of CO in the reaction feed is pivotal for the excellent reaction performance. Based upon XPS analysis, the critical role of CO was revealed, which is to maintain the metallic state of reactive Ir species during the oxidation cycles.
Funding Information
  • Ministry of Science and Technology of the People's Republic of China (2017YFB0602200)
  • Natural Science Foundation of Beijing Municipality (1182005)
  • Youth Innovation Promotion Association of the Chinese Academy of Sciences
  • National Natural Science Foundation of China (21821004, 91845201, 91645115, 51872008, 21573254, 21725301, U1732267)

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