Hydroisomerization of n-dodecane over Pt/Y zeolites with different acid characteristics

Hyung Won Lee, Jong Ki Jeon, Kwang Eun Jeong, Chul Ung Kim, Soon Yong Jeong, Jeongsik Han, Young Kwon Park

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25 Scopus citations

Abstract

n-Dodecane was hydroisomerized over Pt supported on Y zeolites with different acid characteristics in a batch reactor. The Y zeolites used were NaY, HY (SiO2/Al2O3=5.1), HY (SiO2/Al2O3=80), and HY (SiO2/Al2O3=200). NaY was ion exchanged with NH4Cl to impart acidity. HY (SiO2/Al2O3=5.1) and HY (SiO2/Al2O3=80) were silylated to modify their acidity. HY(80) and NaY(5.1) zeolites were examined by XRD and NMR methods only, while Pt/NaY and Pt/HY samples were subjected to investigation, besides XRD method, by N2 adsorption/desorption, NH3 TPD, and FT-IR methods. For NaY, HY (SiO2/Al2O3=5.1), HY (SiO2/Al2O3=80) and HY (SiO2/Al2O3=200), the conversion of n-dodecane decreased with increasing SiO2/Al2O3, whereas selectivity of isomerization increased with increasing SiO2/Al2O3. HY (SiO2/Al2O3=80) showed the best hydroisomerization activity. The catalytic activities of NaY and HY (SiO2/Al2O3=5.1) were enhanced significantly by ion-exchange and silyation, respectively. The effects of temperature, pressure and Pt loading on the catalytic activity were also investigated.

Original languageEnglish
Pages (from-to)111-117
Number of pages7
JournalChemical Engineering Journal
Volume232
DOIs
StatePublished - Oct 2013

Keywords

  • Acidity
  • Hydroisomerization
  • N-Dodecane
  • Pt
  • Y zeolite

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