期刊
C-JOURNAL OF CARBON RESEARCH
卷 4, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/c4040061
关键词
methane decomposition; microwave plasma; optical emission spectroscopy; carbon black; nanostructure; TEM
资金
- Department of Energy, Office of Science [186949]
- H Quest Vanguard, Inc. [DE-SC0015895]
- U.S. Department of Energy (DOE) [DE-SC0015895] Funding Source: U.S. Department of Energy (DOE)
Methane is the primary industrial H-2 source, with the vast majority produced by steam reforming of methane-a highly CO2- and water-intensive process. Alternatives to steam reforming, such as microwave-driven plasma-mediated methane decomposition, offer benefits of no water consumption and zero CO2 process emissions while also producing solid carbon formed by pyrolytic reactions and aided by a plasma reactive environment. The economic viability of pyrolytic methane decomposition as a hydrogen source will depend upon the commercial applications of the solid carbon product-which, in turn, will depend upon its physical and chemical characteristics. This study focuses on material characterization of the solid carbon (secondary) product. Characterization by high-resolution transmission electron microscopy reveals forms ranging from graphitic to amorphous. Thermogravimetric analyses reveal three forms by their differing oxidative reactivity, while X-ray diffraction analyses support the different crystalline forms as suggested by Thermogravimetric analysis. Plasma perturbation of the radical pool, elevating radical temperatures and boosting concentrations, is proposed as altering the reaction paths towards solid carbon formation, resulting in the different sp(2) forms.
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