Hydrodeoxygenation of Guaiacol over MoO₃-NiO/Mesoporous Silicates: Effect of Incorporated Heteroatom

Abstract

Ordered mesoporous silicate SBA-15 and Ti-SBA-15 (Si/Ti = 10) and mesoporous aluminosilicate MAS (Si/Al = 20) supports were prepared by a hydrothermal method. Peptization of γ-alumina with these supports was carried out with 2% acetic acid, and the resulting composite materials were loaded with 3 wt % NiO and 10 wt % MoO 3 by a simple impregnation method. The physicochemical properties of these catalysts were examined with the following techniques, such as XRD, N 2 sorption, diffuse reflectance UV−vis spectra, TEM, H 2 -TPR, NH 3 -TPD, and H 2 chemisorption. Ti and Al incorporated supported catalysts strongly influence the hydrodeoxygenation (HDO) activity of guaiacol, investigated in a fixed-bed down-flow quartz reactor at atmospheric pressure. The MoO 3 -NiO/MAS supported catalyst shows maximum conversion compared to MoO 3 -NiO/Ti-SBA-15 and MoO 3 -NiO/SBA-15. γ-Alumina composite catalysts displayed an improved HDO activity attributed to an increased acidity and dispersion of active sites.

An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds

“…Metallic oxide also been investigated as catalyst for bio-oil upgrading. Selvaraj et al considered HDO of guaiacol over MoO 3 -NiO/mesoporous silicates at atmospheric pressure, observing the following order of HDO activities: MoO 3 -NiO/MAS (mesoporous aluminosilicate) > MoO 3 -NiO/Ti-SBA-15 > MoO 3 -NiO/SBA-15 [97]. However, naphthenic hydrocarbon was the major product over MoO 3 -NiO/MAS compared to other catalysts, where and aromatic hydrocarbon was the major product.…”

Using decalin and tetralin as hydrogen source for transfer hydrogenation of renewable lignin-derived phenolics over activated carbon supported Pd and Pt catalysts

“…However, lignin-derived phenolic compounds are highly persistent in hydrodeoxygenation reaction. Therefore, transformation of phenolic compounds to high-value and stable components is a research field of great interest, and several researches have been conducted for study of catalytic hydrogenation of phenols [20][21][22][23][24][25][26] . High-pressure hydrogen gas is commonly used for catalytic hydrogenation of bio-oil/bio-oil model compounds.…”

Synthesis of Renewable Diesel Range Alkanes by Hydrodeoxygenation of Palmitic Acid over 5% Ni/CNTs under Mild Conditions

“…It is considered that the CNTs-supported Ni catalyst reveals a model of "support The typical N 2 adsorption-desorption isotherm and BJH (Barrett-Joyner-Halenda) pore size distribution plot of 5% Ni/CNTs are displayed in Figure 2. A representative-type IV curve was exhibited in the nitrogen adsorption-desorption isotherm with sharp capillary condensation steps at relative pressures of 0.8-0.98 (Figure 2a) [41]. The H1-type hysteresis loop demonstrates the typical mesoporous material property [42].…”