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Four arylhopanes, i.e.,hopane, and 30-(thien-2-ylmethyl)hopane, were enriched from Shengli lignite, and their structures were tentatively identified by gas chromatography/mass spectrometry. Phenylhopanes were unreported before and thienylhopanes were rarely detected in coals. The nearly equal relative contents of 22-phenyl-30-norhopane and 22-(o-tolyl)-30-norhopane suggest that a hopanoid precursor with a longer side chain compared to bacteriohopanetetrol should exist in nature. A novel type of cyclization reaction (cyclized at C30) of hopanoid polyols was proposed.

A novel synthesis method was developed to prepare a silica-supported monoclinic molybdenum dioxide (MoO 2 / SiO 2 ) catalyst via calcination of molybdenum disulfide (MoS 2 )/SiO 2 in N 2 flow with 0.1 vol % O 2 . MoO 2 /SiO 2 was employed as a catalyst for sawdust hydroliquefaction in ethanol at 320 °C under an initial H 2 pressure (IHP) of 2−6 MPa, and the bio-oil yield as high as 72.3% was obtained under an IHP of 6 MPa. The high catalytic activity of MoO 2 /SiO 2 should be attributed to the efficient cleavage of H 2 on the surface of highly dispersed MoO 2 , which shows an unusual metallic characteristic. The obtained bio-oil was analyzed with gas chromatography/mass spectrometry (GC/MS), and the main organic compounds detected by GC/ MS were phenolics and ethyl esters.