Trialkylmethylammonium molybdate ionic liquids as novel oil-soluble precursors of dispersed metal catalysts for slurry-phase hydrocracking of heavy oils. (18th May 2022)

• Record Type: Journal Article
• Authors: Ma, Yongde; Zhang, Jiayin; Wu, Wenquan; Cai, Zhenping; Cao, Yanning; Huang, Kuan; Jiang, Lilong
• Is Part Of: Chemical engineering science. Volume 253(2022)
• Publication Date: 2022-05-18
• Subjects: Heavy oil -- Hydrocracking -- Dispersed catalyst -- Ionic liquid -- Sulfidation; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2022.117516
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Trialkylmethylammonium molybdate ILs with multiple long-chain alkyl groups were designed. The molybdate ILs were synthesized from readily available reagents under mild condition. The molybdate ILs were applied as oil-soluble precursors for slurry-phase hydrocracking. The sulfidation behavior and hydrocracking performance of molybdate ILs were examined. [N6661 ]2 MoO4 shows even better performance than a commercial precursor (Mo IV -isooctoate). Abstract: Slurry-phase hydrocracking is an effective technology for the conversion of heavy oils to clean and light fuels. Herein, trialkylmethylammonium molybdate ionic liquids (ILs) with multiple long-chain alkyl groups were designed, and applied as the oil-soluble precursors of dispersed metal catalysts for slurry-phase hydrocracking. The molybdate ILs were synthesized through a two- or three-step route from readily available reagents under mild conditions. The chemical structure and sulfidation behavior of molybdate ILs were characterized first. The performance of molybdate ILs for hydrogenation was then evaluated with phenanthrene as the model compound. The dispersed MoS2 catalysts in-situ produced in the model system were isolated and characterized to explain the different performance of oil-soluble precursors. The performance of molybdate ILs for slurry-phase hydrocracking of heavy oils was finally investigated. To figure out the favored routes for the conversion of heavy oils, the reaction rate constants were also calculated based on an established kinetical model.