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Hydrodesulfurization of polyaromatic sulfur-containing compounds in light oil was carried out by using Co-Mo/Al2O3 under experimental conditions representative of industrial practice. Alkyl-substituted dibenzothiophenes in light oil, especially 4,6-dimethyldibenzothiophene, were difficult to desulfurize even under deep desulfurization conditions.
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Ishihara et al. (1992) studied this question.
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