Increase of the Ni/W ratio in heteropolyanions based NiW hydrocracking catalysts with improved catalytic performances

K. Ben Tayeb (1) , C. Lamonier (2) , C. Lancelot (2) , M. Fournier (2) , A. Bonduelle-Skrzypczak (3) , F. Bertoncini (3)

1 LASIRE - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516
2 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
3 IFPEN - IFP Energies nouvelles

In the present work, we investigated the influence of the increase ofNi/W ratio by the addition of nickel nitrate on heteropolycompound (HPC) based catalysts. Synthesized catalysts were characterized by Raman, XPS and HRTEM techniques and were examined in the model reaction of toluene hydrogenation. The Ni₂SiW₁₂O₄₀based catalyst with a ratio of 0.36 obtained by addition of nickel nitrate was found to have the best catalytic activity compared to the most efficient of the HPC based catalysts with a stoichiometric Ni/W ratio of 0.36. Raman spectroscopy showed that the SiW₁₂O₄₀^4-HPA was decomposed during the drying step in SiW₁₁O₃₉^8-species.

Mots clés: Heteropolyanion; HRTEM; Hydrocracking; NiW ratio; Raman; Toluene hydrogenation; XPS

Domaines: Chimie théorique et/ou physique

K. Ben Tayeb, C. Lamonier, C. Lancelot, M. Fournier, A. Bonduelle-Skrzypczak, et al.. Increase of the Ni/W ratio in heteropolyanions based NiW hydrocracking catalysts with improved catalytic performances. Catalysis Letters, 2014, 144, pp.460 - 468. ⟨10.1007/s10562-013-1173-5⟩. ⟨hal-01387819⟩