Abstract
This study demonstrates that oil shale subjected to pyrolysis at 1000 °C strongly absorbs electromagnetic radiation in the terahertz (THz) range. Analyses reveal obvious differences between oil shale samples with and without pyrolysis, as well as between low-middle mature shale and oil shale samples. The electromagnetic absorption effect of oil shale subjected to pyrolysis conditions is demonstrated to be strongly related to its relatively small concentration of pyrite, which progressively yields pyrrhotite and elemental Fe during pyrolysis that facilitates the absorption of THz radiation. Accordingly, oil shale can be used not only as a resource for generating oil, natural gas, and petrochemical products, but the material obtained after processing can also be employed for the absorption of THz radiation as a means of converting incident electromagnetic radiation into heat or other forms of energy, which offers substantial prospects in many engineering and technology applications.
Highlights
Oil shale represents a tremendously prolific and predominantly untapped natural energy resource with many known deposits worldwide
This is an important consideration in the comprehensive utilization of oil shale because the associated morphology of kerogen and pyrite has been shown to be an important factor affecting the pyrolysis of kerogen
The existence of a small concentration of Si at point 3 is indicative of a silicate matrix. These results indicate that pyrite on the surface of the microspheres begins to decompose for a pyrolysis temperature greater than 500◦C, and sulfur gas is released, resulting in the formation of an iron sulfide of lower sulfur content, i.e., pyrrhotite FeSx, where 1 ≤ x < 2, which was subjected to successive oxidation
Summary
Oil shale represents a tremendously prolific and predominantly untapped natural energy resource with many known deposits worldwide. Oil shale collected from numerous regions in China has been found to contain pyrite in concentrations of approximately 5 wt% [8] This is an important consideration in the comprehensive utilization of oil shale because the associated morphology of kerogen and pyrite has been shown to be an important factor affecting the pyrolysis of kerogen. The absorption of incident electromagnetic radiation in the THz region by appropriately absorbing materials can convert this electromagnetic radiation into heat or some other form energy. Oil shale can be used as a resource for generating oil, natural gas, and petrochemical products, but the material obtained after processing can be employed for the absorption of THz radiation as a means of converting incident electromagnetic radiation into heat or other forms of energy
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