Journal
FUEL
Volume 134, Issue -, Pages 237-243Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2014.05.068
Keywords
ZSM-23 (MTT-type zeolite); Sufur; Nitrogen; Diesel; Dewaxing
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2012R1A1A2000922]
- National Research Foundation of Korea [2012R1A1A2000922] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Hydroisomerization and hydrocracking of n-hexadecane in the presence of sulfur and nitrogen compound were investigated over four different platinum loaded ZSM-23 catalysts (Pt/ZSM-23, Pt-Pd/ZSM-23, Pt-Mg/ZSM-23 and Pt-Pd-Mg/ZSM-23). Sulfur and nitrogen compounds could poison metal and acid sites of bifunctional catalysts, respectively. In this study, effort has been made to improve the sulfur and nitrogen tolerance in the conversion of n-hexadecane by introducing palladium and magnesium as additives. Pt-Pd bimetallic catalysts increased the electron-deficiency of metal sites, leading to the improvement of sulfur tolerance. The addition of magnesium on platinum loaded ZSM-23 increased the concentration of Lewis acid sites and thereby the poisoning of nitrogen compound was discouraged. The applicability of Pt-Pd-Mg/ZSM-23 catalyst for dewaxing process was further examined using diesel feeds with sulfur compound such as dimethyl disulfide in a high pressure pilot plant. Pt-Pd-Mg/ZSM-23 catalyst showed good catalytic performance for dewaxing process in terms of diesel product yield and long-term stability. (C) 2014 Elsevier Ltd. All rights reserved.
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