Preparation of Iron-Based Catalysts by Mechanical Solid-Phase Ball Milling and Their Applications in Cohydrogenation of Coal and Petrochemical Coking Residual Oil

Abstract

Catalysts are an important factor in reducing harsh reaction conditions and increasing oil yields for the cohydrogenation of coal-oil. In this article, nano-iron-based catalysts have been prepared by mechanical solid-phase ball milling with FeCl 3 •6H 2 O, Fe(NO 3 ) 3 •9H 2 O, and ammonium carbonate as reactants. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. With these catalysts, cohydrogenation behaviors of coal-oil have been carried out with Hami Baishihu coal and Karamay petrochemical coking residual oil under conditions of 400 °C, initial pressure of 7 MPa, and reaction time of 1 h. The results showed that the coal conversion rate reached 98.45% and the oil yield reached 77.73% when the catalyst prepared with FeCl 3 •6H 2 O as an iron source was added. Compared with research results reported in the literature, under the same conditions, the catalyst prepared in this article showed better catalytic activity in the cohydrogenation of coal-petrochemical coking residual oil.

Catalytic Effect of Reactive Extraneous Mineral Composites on Char and Tar Distribution during Pyrolysis of Highveld Partially Oxidized Fine-Coal Reject and Its Beneficiated Residues

“…Several researchers performed pyrolysis experiments to evaluate the catalytic effects of inherent and EMs of Chinese, Japanese, American, and Middle Eastern coals. – Fu et al studied and compared the individual reactivity effects of potassium chloride (KCl), CaO, and Fe 2 O 3 during pyrolysis of North Chinese low-rank coal and reported the catalytic potency in the order of Fe 2 O 3 > KCl > CaO. The three minerals resulted in three different reaction effects: KCl promoted the tar yield, CaO promoted the gas yield, and Fe 2 O 3 promoted the char yield.…”

“…Generally, catalysts have been applied widely in chemical production to lower operating temperatures and pressures and to facilitate product selectivity . In this study, the selected ROSH only served to simulate EMs with catalytic effects to understand their nature and behavior during the FCR pyrolysis.…”

“…Generally, catalysts have been applied widely in chemical production to lower operating temperatures and pressures and to facilitate product selectivity. 15 In this study, the selected ROSH only served to simulate EMs with catalytic effects to understand their nature and behavior during the FCR pyrolysis. Furthermore, the addition of ROSH composites which are not co-feedstock of this proposed pyrolysis to the FCR samples may possess novel insights and perspectives that can considerably enhance better understanding of the mode of occurrence of EMs on char and tar yields during the FCR pyrolysis.…”