The role of sulphur in coal hydroliquefaction

A study on the thermal decomposition of coal-derived pyrite

“…The presence of pyrite and its transfer influence and decide the operational, environmental and economical performance of handling and utilizing processes of coal. This is because pyrite releases a major source of SO 2 (acid rain precursor) in the combustion process and many evidences also suggest that it may possibly possess a catalytic role in coal liquefaction and gasification processes [1][2][3].…”

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

“…As shown in Figure , the higher oil yield and coal conversion at the S/Fe atomic ratio of 0.6 may be due to the formation of the high activity of sulfur‐rich pyrrhotite (Fe 0.8917 S). It was reported that the sulfur‐rich pyrrhotite surface had a large number of iron vacancies that could adsorb active hydrogen, stabilize free radicals, and promote the decomposition of some organic functional groups such as ether bonds, resulting in the increase of oil yield and coal conversion . In addition, Table also displays the crystallite size of Fe 1 − x S calculated by the Scherrer equation.…”

“…Previous investigations reported that the presence of sulfur could enhance coal liquefaction performances not only by promoting the formation of pyrrhotite but also by producing H 2 S . Consequently, it is necessary to make an investigation of the distribution of sulfur during coal liquefaction.…”

“…In liquefaction, it was reported that H 2 S had two roles. On one hand, H 2 S reacted with iron oxide to form pyrrhotite . On the other hand, H 2 S decomposed to produce active hydrogen that further combined with the free radicals generated from coal pyrolysis .…”

Solvent-Free Synthesis of Some1-Acetyl Pyrazoles

“…, sulphated and molybdated iron oxide 12 and sulphated and phosphate zirconia 13 were employed for solvent assisted and solvent-free synthesis of organics. Osman et al, 1 have synthesised 75% yield of 4,7-dimethoxy-5-(5-aryl-N-acetylpyrazolin-3-yl)benzofuran-6-ols by refluxing of Khellinone chalcones, hydrazine hydrate and glacial acetic acid.…”