Hydrodeoxygenation of Fatty Acids, Triglycerides, and Ketones to Liquid Alkanes by a Pt–MoO_x/TiO₂ Catalyst

Abstract

Various supported metal catalysts are screened for hydrogenation of lauric acid and 2‐octanone as model reactions for the transformation of biomass‐derived oxygenates to liquid alkanes (biofuels) in a batch reactor under solvent‐free conditions. Among the catalysts tested, Pt and MoOx co‐loaded on TiO2 (Pt–MoOx/TiO2) shows the highest yields of n‐alkanes for both of the reactions. Pt–MoOx/TiO2 selectively catalyzes the hydrodeoxygenation of various fatty acids and triglycerides to n‐alkanes without C−C bond cleavage under 50 bar H2 and shows higher turnover numbers than the catalysts in the literature. Pt–MoOx/TiO2 is effective also for the hydrodeoxygenation of various ketones to the corresponding alkanes. In situ IR study of the reaction of adsorbed acetone under H2 suggests that the high activity of Pt–MoOx/TiO2 is attributed to the cooperation between Pt and Lewis acid sites of the MoOx/TiO2 support.

The Catalytic Reduction of Carboxylic Acid Derivatives and CO2 by Metal Nanoparticles on Lewis‐Acidic Supports

“…The volume‐area mean diameter of these Pt particles (4.7±1.1 nm) is close to the average diameter of the Pt particles (4.1 nm) obtained from the CO adsorption experiment, under the assumption that CO is adsorbed on the surface of the spherical Pt particles at a stoichiometry of CO/(surface Pt atom)=1/1 . MoOx particles were not observed by a TEM analysis of Pt‐MoOx/TiO 2 even for samples with high Mo loadings (15 wt%) . The same conclusion was reached by high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) with EDX analysis (Figure ), i. e., instead of aggregates, Mo species that were highly dispersed over the TiO 2 particle were observed.…”

“…In our efforts to develop an efficient method for the hydrodeoxygenation of triglycerides and fatty acids, we observed that Pt‐MoOx/TiO 2 selectively catalyzes the hydrodeoxygenation of various fatty acids and triglycerides to n ‐alkanes under 50 bar of H 2 , while the C−C bonds remain intact and the turnover numbers are higher than those for other catalysts reported in the literature . Among the various catalysts tested, Pt‐MoOx/TiO 2 showed the highest percentages of oxygen removal (99 %), while that of Pt/Nb 2 O 5 was good (74 %).…”

“…The ester is then subjected to hydrogenolysis to give the alcohol, which is hydrogenated to the alkane. Pt‐MoOx/TiO 2 is also effective for the hydrodeoxygenation of ketones to alkanes . Scheme shows the yields of alkanes for the reaction of various ketones under 8 bar of H 2 at 200 °C for 24 h using a small amount of Pt‐MoOx/TiO 2 (0.1 mol %).…”

Mesoporous Aluminosilicate Nanofibers with a Low Si/Al Ratio as Acidic Catalyst for Hydrodeoxygenation of Phenol

“…However, they are unstable in HDO conditions and suffer from desulfurization with time leading to sulfur enrichment of the product and catalyst deactivation. [10] To overcome this drawback, HDO catalysis has been recently oriented towards noble metal catalysts [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] which are very effective to activate and cleave hydrogen molecules. [12] It is well known that the support materials have also a significant impact on the catalyst activity in HDO reactions.…”

Selective Hydrodeoxygenation of Vegetable Oils and Waste Cooking Oils to Green Diesel Using a Silica-Supported Ir-ReO x Bimetallic Catalyst

“…These catalysts are also effective for selective hydrogenationo fu nsaturated aldehydes to unsaturated alcohols. [43][44][45][46] Thus, we hypothesize that Ir-ReO x /SiO 2 can be an effective catalyst for the HDO of vegetable oils and WCO to produce alkanesw ith high carbon efficiency. [43][44][45][46] Thus, we hypothesize that Ir-ReO x /SiO 2 can be an effective catalyst for the HDO of vegetable oils and WCO to produce alkanesw ith high carbon efficiency.…”