Improvement of hydrothermal stability of Pt/SAPO-11 catalyst in hydrodeoxygenation-isomerization-aromatization of vegetable oil

Moshe Rabaev, Miron V. Landau, Roxana Vidruk-Nehemya, Amir Goldbourt, Moti Herskowitz

Research output: Contribution to journalArticlepeer-review

Abstract

SAPO-11 component of Pt/SAPO-11-Al2O3 catalysts displays relatively low hydrothermal stability in hydrotreating of vegetable oils that produces water during the process. Application of XRD, HRTEM, NH3 TPD, TPO, H2 pulse chemisorptions and 29Si MAS NMR revealed that the reason for hydrothermal deactivation of SAPO-11 is partially reversible desilication of its framework. This results in gradual loss of acidity and catalytic activity in isomerization of normal paraffins - products of oil deoxygenation. Addition of amine surfactant hexadecylamine to SAPO-11 crystallization gel at HDA/Al2O3 ratio of ∼0.6 strongly increases the hydrothermal stability of SAPO-11. This translates in stable operation of Pt/SAPO-11-Al2O3 catalyst in hydrotreating of soybean oil yielding >99% deoxygenation and producing liquid organic product with cloud point < -35 °C containing 15 wt% monoaromatics. The stabilizing effect of HDA is a sequence of increasing the relative content of Si(nAl(4-n)Si) tetrahedra with n = 3-4 displaying higher resistance to hydrothermal desilication.

Original languageEnglish
Pages (from-to)164-176
Number of pages13
JournalJournal of Catalysis
Volume332
DOIs
StatePublished - 1 Dec 2015

Keywords

  • Hydrothermal stability
  • Hydrotreating
  • Pt/SAPO-11-AlO catalysts
  • Soybean oil

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