Tunable ionic liquids as oil-soluble precursors of dispersed catalysts for suspended-bed hydrocracking of heavy residues. (1st April 2022)

• Record Type: Journal Article
• Authors: Cai, Zhenping; Ma, Yongde; Zhang, Jiayin; Wu, Wenquan; Cao, Yanning; Jiang, Lilong; Huang, Kuan
• Is Part Of: Fuel. Volume 313(2022)
• Publication Date: 2022-04-01
• Subjects: Heavy residue -- Suspended-bed hydrocracking -- Dispersed catalyst -- Ionic liquid -- Sulfidation; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2021.122664
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: [Cn mim] + cations were paired with [MoO4 ] 2− anion to construct Mo-containing ILs. [Cn mim]2 [MoO4 ] ILs were used as precursors for suspended-bed hydrocracking. Dispersed MoS2 with hydrogenation activity were obtained after sulfidation. Tuning [Cn mim]2 [MoO4 ] ILs results in improved suspended-bed hydrocracking. [C10 mim]2 [MoO4 ] is superior to Mo(IV)-isooctoate in hydrocracking performance. Abstract: Suspended-bed hydrocracking employing oil-soluble metal-containing compounds as the precursors of dispersed catalysts is an effective technology for the upgrading of heavy residues. We proposed to pair 1-alkyl-3-methylimidazolium cations [Cn mim] + with molybdate anion ([MoO4 ] 2- ) to construct Mo-containing ILs (i.e., [Cn mim]2 [MoO4 ]). The chemical structure and sulfidation behavior of [Cn mim]2 [MoO4 ] ILs were characterized in details. The performance of [Cn mim]2 [MoO4 ] ILs as oil-soluble precursors of dispersed catalysts for suspended-bed hydrogenation of model compound, and hydrocracking of actual heavy residues were systematically examined. The dispersed MoS2 in-situ generated from [Cn mim]2 [MoO4 ] ILs in model system were also collected and characterized. It demonstrated that by varying the alkyl chain lengths from hexyl (C6 ) to hexadecyl (C16 ), a series of dispersed MoS2 with different hydrogenation activity were obtained. Thus, tuning the structure of [Cn mim]2 [MoO4 ] ILs can result in improved suspended-bed hydrocracking. The results obtained herein provide important guidance for the designing of oil-soluble precursors of dispersed catalysts.