Abstract
Natural gas pyrolysis produces hydrogen and solid carbon at high temperatures in an oxygen-free environment. This study has evaluated the characteristics of solid carbon obtained from the pyrolysis of methane and natural gas by using molten tin (Sn) at 900–1000 °C. Material characterization outcomes revealed that solid carbon produced at 1000 °C has a spherical morphology. At this temperature, methane and natural gas pyrolysis have resulted in the arrangement of nanocrystalline carbon spheres with average sizes of 635 and 287 nm, respectively. Similarly, pyrolysis at 900 °C and 950 °C has yielded nanocrystalline carbon featuring diverse morphologies such as spheres, fibrous, and irregularly shaped particles. Thermogravimetric analysis revealed that solid carbon products obtained from methane and natural gas pyrolysis at 1000 °C have higher thermal stability compared to commercial carbon black N991. Surface area analysis has indicated that solid carbon from natural gas pyrolysis at 1000 °C has 4.3- and 5.3-times higher surface area compared to the commercial carbon black N991 sample and graphite flakes, respectively. These findings offered insights into optimizing pyrolysis reactor design and operation to generate valuable solid carbon by-products while maximizing hydrogen production.
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Abbreviations
- BET:
-
Brunauer–Emmett–Teller
- CB:
-
Carbon black
- DI:
-
Deionized water
- EDX:
-
Energy-dispersive X-ray spectroscopy
- HAADF:
-
High-Angle Annular Dark-Field
- OD:
-
Outer diameter
- Mt:
-
Million tonnes
- MP:
-
Methane pyrolysis
- NGP:
-
Natural gas pyrolysis
- SC:
-
Solid carbon
- SCCM:
-
Standard cubic centimetres per minute
- SEM:
-
Scanning electron microscopy
- STEM:
-
Scanning transmission electron microscopy
- TEM:
-
Transmission electron microscopy
- TGA:
-
Thermogravimetric analysis
- XRD:
-
X-ray diffraction spectroscopy
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Acknowledgements
The authors gratefully acknowledge the financial support of Alberta Innovates, the Ministry of Jobs, Economy, and Innovation, and the Government of Alberta. The authors thank ATCO Gas and Pipelines Ltd. in Alberta for providing the pipeline natural gas for testing and characterization. The authors acknowledge Dr. Paolo Marcazzan from the Clean Energy Research Centre at the University of British Columbia for his input in the preparation of the manuscript. Also, the authors thank Mr. James A. Nott from the Pacific Centre for Isotopic and Geochemical Research (PCIGR), Dept. of Earth, Ocean & Atmospheric Sciences at the University of British Columbia for conducting the Raman analysis and Miss. Kanageswari Singara Veloo from the Biomass and Bioenergy research group, the Clean Energy Research Center (CERC) at the University of British Columbia for conducting thermogravimetric analysis. The TEM and XRD analyses work made use of the 4D LABS core facility at Simon Fraser University (SFU) supported by the Canada Foundation for Innovation (CFI), British Columbia Knowledge Development Fund (BCKDF), and Pacific Economic Development Canada (PacifiCan).
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Patlolla, S.R., Sharafian, A., Katsu, K. et al. Temperature effects on the properties of solid carbon from natural gas pyrolysis in molten tin. Carbon Lett. (2024). https://doi.org/10.1007/s42823-024-00716-2
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DOI: https://doi.org/10.1007/s42823-024-00716-2