โ Scribed by Haokan Chen; Baoqing Li; Bijiang Zhang
No coin nor oath required. For personal study only.
The thermal behaviors of pure pyrite are studied under nitrogen and hydrogen atmospheres in a pressurized thermal balance. The transfer of pyrite in coal during pyrolysis and hydropyrolysis is investigated in a ยฎxed-bed reactor. The results suggest that the indigenous hydrocarbon with hydrogen donor ability in coal can promote the reduction of pyrite in pyrolysis. At low temperatures, organic sulfur removals are almost the same in pyrolysis and hydropyrolysis of two coals. It is likely that indigenous hydrogen in coal is the dominant factor in organic sulfur elimination in the low-temperature stage. An increase of organic sulfur in pyrolysis of Hongmiao coal indicates that the lack of the indigenous hydrogen may be the key factor determining the transformation of pyritic sulfur into organic sulfur. Oxygen affects the conversion of pyrite into organic sulfur through the competitive consumption of hydrogen.
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X-ray Photoelectron Spectroscopy (XPS) was used to study mineral, synthetic and coalassociated pyrites, oxidized for various time intervals at low temperatures with humid air or oxygen. This was done to find out if XPS could detect, monitor and clarify pyrite surface-oxidative changes that influence