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Two different rank coals with high organic sulfur content were selected and pretreated with tetrachloroethylene (PCE) under ultrasonic field. The effects of pretreating process on sulfur forms in two coals have been investigated by chemical analysis and sulfur K-edge X-ray absorption spectroscopy (S-XAS). The transformation behaviors of sulfur forms during pyrolysis of raw and PCE-treated coals in...
Sulfur K-edge X-ray absorption near edge structure (XANES) spectroscopy was applied to determine the sulfur forms in a calcium-rich lignite coal (L coal) and a high-sulfur bituminous coal (B coal), and to investigate their transformations during the co-pyrolysis of two coals. Calcium K-edge XANES spectroscopy was used for examining the occurrence modes of calcium in two coals and their transformation...
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