Hydrotreating of light cycle oil over NiMo and CoMo catalysts with different supports

Nor Azizi, Syed Ahmed Ali, Khalid Alhooshani, Taegon Kim, Youngjin Lee, Joo Il Park, Jin Miyawaki, Seong-Ho Yoon, Isao Mochida

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

To overcome the inhibition of aromatic compounds in low nitrogen light cycle oil (LCO) on its deep hydrodesulfurization (HDS), CoMo and NiMo sulfide catalysts supported on γ-alumina, alumina coated zeolite (ACZ) and TiO2 were investigated with the objective of achieving ultra-low sulfur through direct desulfurization route at relatively high temperature of 360 °C. Higher temperature certainly accelerated the HDS probably through direct desulfurization route over all the catalysts studied. It also resulted in reduction of total aromatics by about 50% leading to a significant cetane number improvement. Conventional Al2O3-supported CoMo and NiMo catalysts were quite active for HDS, hydrogenation and hydrogenolysis, but they could not meet the demand of deep HDS to achieve 10-15 ppm sulfur in hydrotreated products, even at higher reaction temperatures of 340-360 °C. Higher acidity alumina coated zeolite (ACZ)-supported catalysts exhibited higher HDS activity compared to Al2O3-supported catalysts. However, they also exhibited highest cracking activity and coke formation, which make them unsuitable for deep HDS at high temperatures. Low-acidic, non-polar (TiO2 and powdered activated carbon (PAC)) supported catalysts could achieve the deep HDS of LCO at 350-360 °C. The HDS activity of TiO2-based catalysts was better than Al2O3-supported catalysts and their cracking activity was significantly lower than Al2O3- and ACZ-supported catalysts. When the LCO was hydrotreated over CoMo/PAC at 350 °C, the product contains only 12 ppm sulfur. Hence, it is concluded that low-acidic, non-polar supports (such as TiO2 and PAC) are more suitable for CoMo and NiMo catalysts to achieve deep HDS of aromatic-rich feedstock such as LCO.

Original languageEnglish
Pages (from-to)172-178
Number of pages7
JournalFuel Processing Technology
Volume109
DOIs
Publication statusPublished - Jan 1 2013

Fingerprint

Hydrodesulfurization
Catalyst supports
Oils
Catalysts
Aluminum Oxide
Zeolites
Alumina
Sulfur
Activated carbon
Desulfurization
Temperature
Hydrogenolysis
Antiknock rating
Aromatic compounds
Sulfides
Acidity
Coke
Feedstocks
Hydrogenation
Catalyst activity

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Azizi, N., Ali, S. A., Alhooshani, K., Kim, T., Lee, Y., Park, J. I., ... Mochida, I. (2013). Hydrotreating of light cycle oil over NiMo and CoMo catalysts with different supports. Fuel Processing Technology, 109, 172-178. https://doi.org/10.1016/j.fuproc.2012.11.001

Hydrotreating of light cycle oil over NiMo and CoMo catalysts with different supports. / Azizi, Nor; Ali, Syed Ahmed; Alhooshani, Khalid; Kim, Taegon; Lee, Youngjin; Park, Joo Il; Miyawaki, Jin; Yoon, Seong-Ho; Mochida, Isao.

In: Fuel Processing Technology, Vol. 109, 01.01.2013, p. 172-178.

Research output: Contribution to journalArticle

Azizi, Nor ; Ali, Syed Ahmed ; Alhooshani, Khalid ; Kim, Taegon ; Lee, Youngjin ; Park, Joo Il ; Miyawaki, Jin ; Yoon, Seong-Ho ; Mochida, Isao. / Hydrotreating of light cycle oil over NiMo and CoMo catalysts with different supports. In: Fuel Processing Technology. 2013 ; Vol. 109. pp. 172-178.
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