Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

Abstract

Nonsulfided CeO2‐supported different metal catalysts were synthesized, characterized and evaluated in the hydrogenation of octanoic acid with a batch reactor at the temperature of 280 oC and initial H2 pressure of 3 MPa. The effect of Mo species was revealed by comparing Mo‐doped catalysts with Mo‐free catalysts. The catalytic results show that the CeO2 supported Ni catalyst doped with Mo exhibit much higher catalytic activity and octane selectivity than the catalysts without dopants. Additionally, the influences of Mo and Ni mass ratio on the conversion of octanoic acid and the selectivity of heptane and octane over CeO2‐based catalysts were also discussed. Ni species seemed beneficial for the deoxygenation reaction to form C7 alkane, while the doping of Mo favored the hydrodeoxygenation path to C8 alkane via dehydration‐hydrogenation of the octanol intermediate.

Hydrodeoxygenation of Octanoic Acid over Supported Ni and Mo Catalysts: Effect of Ni/Mo Ratio and Catalyst Recycling

“…Similarly, the selectivity of octane also increased sharply from 0% to a maximum of 72.6%.Therefore, the possible reaction pathways involves initial octanoic acid hydrogenates to produce octanal, then the octanal subsequently decarbonylates to heptane and hydrogenates to octanol simultaneously, and finally octanol dehydrates and hydrogenates to octane, which is consistent with our previous work and the work of Yanan Duan et al. ,. Besides, the strong influence of hydrogen pressure on catalyst performance should also be expected .…”

“…In our previous work, octanoic acid was chosen as the model to investigate deoxygenation catalyzed by NiMo/CeO 2 . NiMo/CeO 2 exhibited good catalytic performance for the deoxygenation of octanoic acid.…”

Kinetic Modeling and Experimental Investigation of Hydro‐Catalytic Upgrading of Anisole as a Model Compound of Bio‐Oils Derived from Fast Pyrolysis of Lignin over Co/γ‐Al2O3

“…Unsaturated oxygenates components in lignin‐derived bio‐oils formed in pyrolysis process cause several undesirable properties including non‐volatility, high viscosity, corrosiveness, poor heating value, immiscibility with fossil fuels, thermal instability, and tendency to be polymerized during storage and transportation. Therefore, chemical modification and refining is required to make them favourable as a fuel . The mentioned drawbacks motivate interest in bio‐oils upgrading techniques including physical methods and a catalytic process to form compounds compatible with hydrocarbons.…”

Two-Step Esterification–Hydrogenation of Bio-Oil to Alcohols and Esters over Raney Ni Catalysts

“…in bio-oil [3][4][5]. In view of the multiple significant problems with biooil's properties [6][7][8], various upgrading techniques have been developed in the last two decades: in situ hydrogenation [9,10], hydrodeoxygenation [4,11], emulsification [12], catalytic cracking [13], steam reforming [14], esterification [15,16], etc. Among the techniques mentioned above, hydrogenation and esterification have received increasing interest due to their mild reaction conditions, especially the combined technologies of them [7,8,[15][16][17][18][19][20].…”