Catalytic hydroconversion of the light residue from Yinggemajianfeng lignite over a solid superacid

•LR was obtained by extracting coal and subsequent isolation via density difference.•About 60% of organic matter in LR was hydroconverted to SP over catalyst at 160 °C.•The main products from the CHC of LR are oxygen-containing organic compounds.•H+ release from TFMSA/ATA plays a crucial role in hyd...

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Veröffentlicht in:Fuel (Guildford) 2022-02, Vol.310, p.122470, Article 122470
Hauptverfasser: Wu, Zi-Fan, Wei, Xian-Yong, Mo, Wen-Long, Kang, Yu-Hong, Zhang, Xiao-Qi, Shan, Xian-Kang, Liu, Guang-Hui, Fan, Xing
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Sprache:eng
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Zusammenfassung:•LR was obtained by extracting coal and subsequent isolation via density difference.•About 60% of organic matter in LR was hydroconverted to SP over catalyst at 160 °C.•The main products from the CHC of LR are oxygen-containing organic compounds.•H+ release from TFMSA/ATA plays a crucial role in hydroconverting LR to SP. TFMSA/ATA was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto the acid-treated attapulgite (ATA). Yinggemajianfeng lignite was extracted ultrasonically with a mixed solvent obtain the extract and extraction residue (ER), and then ER was separated by density difference to obtain the light residue (LR). The non-catalytic hydroconversion (NCHC) and TFMSA/ATA-catalyzed hydroconversion of LR were investigated in cyclohexane at 160 °C under 4 MPa of initial hydrogen pressure for 12 h. The soluble portions from NCHC (SPNCHC) and catalytic hydroconversion (SPCHC) were analyzed with a Fourier transform infrared spectrometer and gas chromatograph/mass spectrometer. As a result, the yield of SPCHC (60.0%) is significantly higher than that of SPNCHC (1.8%), suggesting that the thermal dissolution of LR at 160 °C is negligible and TFMSA/ATA significantly catalyzed the hydrocracking of LR to release SPCHC. Oxygen-containing organic compounds, especially 4-methylpent-3-en-2-one and 4-hydroxy-4-methylpentan-2-one, are predominant produced from the CHC of LR, suggesting that the cleavage of > Cα-Oβ- and > Cβ-Oα- bonds in LR significantly proceeded during the CHC of LR over TFMSA/ATA. Such a mechanism was proved by the CHC of oxybis(methylene)dibenzene.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122470