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Insights into carbon formation over molten salt-promoted NiO/Al2O3 during methane pyrolysis

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(5), pp.1471-1480
  • DOI : 10.1007/s42823-024-00700-w
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : September 27, 2023
  • Accepted : February 9, 2024
  • Published : June 14, 2024

He Yangdong 1 Jing Xingsheng 2 Qin Li 3 Wang Dan 1 Wu Chen 1 Liu Mengying 4 Yang Mingkai 4 Huang Zeai 4

1Research Institute of Natural Gas Technology, PetroChina Southwest Oil and Gasfield Company
2PetroChina Southwest Oil and Gasfield Company, Chengdu
3Southern Sichuan Gas District, PetroChina Southwest Oil and Gasfield Company, Luzhou
4School of New Energy and Materials, Southwest Petroleum University

Accredited

ABSTRACT

Pyrolysis of methane is a carbon-economic method to obtain valuable carbon materials and COx-free H2, under the carbon peaking and carbon neutrality goals. In this work, we propose a methane pyrolysis process to produce graphite and H2 using bubble column reactor containing NiO/Al2O3 and NaCl–KCl (molten salt). The process was optimized by the different amounts of NaCl–KCl, the CH4/Ar ratio and temperature, indicating that the CH4 conversation rate could reach 92% at 900 °C. Meanwhile, we found that the addition of molten salt could obtain pure carbon materials, even if the conversation rate of CH4 decreases. The analysis of the carbon products revealed that graphite could be obtained.

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