Catalytic hydroconversion of extraction residues from two Chinese lignites to arenes

Abstract

Abstract A solid superacid TFMSA/MPZCA was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) into mesoporous zirconia-coated attapulgite (MPZCA). Using TFMSA/MPZCA, the catalytic hydrocracking of coal-related model compounds (CRMCs) oxybis(methylene)dibenzene (OBMDB), benzyloxybenzene (BOB), and di(1-naphthyl)methane (DNM) and the catalytic hydroconversion (CHC) of extraction residues (ERs, isometric carbon disulfide/acetone-insoluble portion) from Huozhou lignite (HL) and Shaerhu lignite (SL) in cyclohexane without H2 were investigated. According to the model reactions, H+ released from TFMSA in TFMSA/MPZCA plays a crucial role in cleaving the\u202f>\u202fCalk-O- and\u202f>\u202fCar-C\u202f \u202fCalk-O- in OBMDB and BOB can be completely cleaved at 170\u202f°C and 190\u202f°C for 3\u202fh, respectively, while the BL of\u202f>\u202fCar-C