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In situ catalytic cracking of low rank coal to light oil

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Document pages: 8 pages

Abstract: Lighter tar is useful in the chemical industry, but in small quantities. Catalytic cracking is used to improve the yield of light tar during pyrolysis. Therefore, this study explored the technology of in-situ modification with MoS2 catalyst. MoS2 catalyst helps to convert high energy cost into low energy cost. The changes of coal pyrolysis tar without catalyst and with catalyst were measured. At the same time, the tar was analyzed by simulated distillation gas chromatograph and element analyzer. Therefore, the catalyst reduces the asphalt content and increases the fraction of light tar from 50 to 60   weight percentage in coal pyrolysis tar. MoS2 catalyst increased the liquid yield from 18 to 33 (weight , DB) and reduced the gas yield from 27 to 12 (W. , db) compared to coal without catalyst. Moreover, it increased H content and hydrogen-to-carbon ratio by 7.9 and 3.3 , respectively, and reduced the contents of nitrogen, sulphur, and oxygen elements by 8.1 , 15.2 , and 23.9 , respectively, in their produced tars compared to coal without catalyst.

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