Beneficial Effect of W Incorporation in Supported Mo‐based Catalysts for the HDO of m‐Cresol
Bertha Farah, Christine Lancelot, Pascal Blanchard, Frédéric Richard, Carole Lamonier
Abstract
Abstract The hydrodeoxygenation (HDO) of m‐cresol was investigated at 340 °C under 30 bar as total pressure over molybdenum oxide‐based catalysts. 10 wt.% Mo were first deposited on various supports (ZrO 2 , TiO 2 , Al 2 O 3 and COK12). The use of oxophilic ZrO 2 and TiO 2 supports allowed to obtain the highest HDO catalytic performances. This result could be in link with the reducibility of Mo, which was found to be dependent on the support nature. Several catalysts containing both W and Mo in oxide phase supported on ZrO 2 were then prepared using various heteropolyacids as precursors (H 4 SiMo x W 12‐x O 40 with x=0, 3, 6, 9 and 12). A synergy was observed between Mo and W and the best catalytic performance was obtained for SiMo 9 W 3 /ZrO 2 . More importantly, the presence of W improved the reducibility of Mo 6+ to Mo 5+ species, which quantity was correlated to catalytic activity suggesting that Mo 5+ could be the active phase in HDO.