Comparison of catalytic hydroliquefaction of Xiaolongtan lignite over FeS, FeS+S and SO42-/ZrO2

Effects of sulfur additive on the transformation behaviors of γ‐Fe2O3 and coal liquefaction performances under mild conditions

“…Therefore, it is of significance to understand the catalytic mechanism of iron‐based catalysts including the active species and the transformation processes in coal liquefaction. Numerous studies on the catalytic mechanism of iron‐based catalysts have been carried out in the past few decades, and it is widely accepted that Fe 1 − x S is the main active species of iron‐based catalysts, and the addition of sulfur (or H 2 S) can significantly promote iron catalyst activities …”

Effect of Pretreatment with Sulfuric Acid on Catalytic Hydrocracking of Fe/AC Catalysts

“…Considerable efforts [8][9][10][11][12][13][14][15] have been contributed to the catalytic performances of metal-based (Fe and Ni) catalysts for DCL or to the reactions of coal-related model compounds. It is generally accepted that catalysts can significantly promote coal pyrolysis by reducing the pyrolysis activation energy and the formation of active hydrogen atoms (AHAs) by facilitating H 2 dissociation [16,17].…”

Roles of Na 2 CO 3 in lignite hydroliquefaction with Fe-based catalyst

“…Moreover, Fe-based catalyst is well-known to be the most practical catalyst for coal hydroliquefaction, because of its relatively high activity, low cost and environmental benign for disposal [5][6][7][8][9][10][11][12][13][14][15][16][17]. Consequently, plenty of studies on coal hydroliquefaction mainly focused on these investigations for Fe-based catalyst: how to improve its catalytic activity by modifying its physical and chemical structures such as crystalline size [6], pore structure [18], dispersive degree [19,20], Fe precursor phase [21], Fe active phase [22], and surface acidity and basicity [8,[23][24][25].…”