TY - JOUR
T1 - Improvement of hydrothermal stability of Pt/SAPO-11 catalyst in hydrodeoxygenation-isomerization-aromatization of vegetable oil
AU - Rabaev, Moshe
AU - Landau, Miron V.
AU - Vidruk-Nehemya, Roxana
AU - Goldbourt, Amir
AU - Herskowitz, Moti
N1 - Publisher Copyright:
© 2015 Elsevier Inc.All rights reserved.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - 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.
AB - 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.
KW - Hydrothermal stability
KW - Hydrotreating
KW - Pt/SAPO-11-AlO catalysts
KW - Soybean oil
UR - http://www.scopus.com/inward/record.url?scp=84946127572&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2015.10.005
DO - 10.1016/j.jcat.2015.10.005
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AN - SCOPUS:84946127572
SN - 0021-9517
VL - 332
SP - 164
EP - 176
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -