Selective hydrocracking of light cycle oil into high-octane gasoline over bi-functional catalysts

Zhengkai Cao, Xia Zhang, Chunming Xu, Xinlu Huang, Ziming Wu, Chong Peng, Aijun Duan

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Light cycle oil (LCO) with high content of poly-aromatics was difficult to upgrade and convert, which had hindered upgrading fuel quality to meet with the standard of automotive diesel for the purpose of sustainable development. The hydrocracking behaviors of typical aromatics in LCO of naphthalene and tetralin were investigated over NiMo and CoMo catalysts. Several characterization methods including N2-adsoprtion and desorption, ammonia temperature-programmed desorption (NH3-TPD), Pyridine infrared spectroscopy (Py-IR), CO infrared spectroscopy (CO-IR), Raman and X-ray photoelectron spectroscopy (XPS) were applied to determine the properties of different catalysts. The results showed that CoMo catalyst with high concentration of S-edges could hydrosaturate more naphthalene to tetralin but exhibit lower yield of high-value light aromatics (carbon numbers less than 10) than NiMo catalyst. NiMo catalyst with high concentration of Mo-edges also presented a higher selectivity of converting naphthalene into cyclanes than CoMo catalyst. Subsequently, the naphthalene and LCO hydrocracking performances were also investigated over different catalysts systems. The activity evaluation and kinetic analysis results showed that the naphthalene hydrocracking conversion and the yield of light aromatics for CoMo-AY/NiMo-AY grading catalysts were higher than NiMo-AY/CoMo-AY grading catalysts at same condition. A stepwise reaction principle was proposed to explain the high efficiency of CoMo-AY/NiMo-AY grading catalysts. Finally, the LCO hydrocracking evaluation results confirmed that CoMo-AY/NiMo-AY catalysts grading system with low carbon deposition and high stability could remain high percentage of active phases, which was more efficient to convert LCO to high-octane gasoline.
Original languageEnglish (US)
Pages (from-to)41-50
Number of pages10
JournalJournal of Energy Chemistry
Volume52
DOIs
StatePublished - May 18 2020
Externally publishedYes

ASJC Scopus subject areas

  • Electrochemistry
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Fuel Technology

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