Catalytic Hydrodeoxygenation of Methyl Stearate and Microbial Lipids to Diesel-Range Alkanes over Pd/HPA-SiO₂ Catalysts

Abstract

Catalytic hydrotreating of renewable oils is a promising way to get diesel alkanes, with the use of microbial lipids further facilitating scalable production of green diesel. The core issue of triglyceride hydrodeoxygenation (HDO) research is still to develop efficient catalysts under mild reaction conditions. Herein, we demonstrate that the heteropolyacid (HPA)-modified SiO2 supported Pd catalysts showed high activity for the HDO reaction of methyl stearate and soybean oil to diesel alkanes (C15∼C18, >90 wt % at 200 °C). Characterizations show that the Brønsted acid sites introduced by grafting heteropolyacid on SiO2 and metal sites of small Pd particles contribute to the high HDO activity of this bifunctional catalyst. Additionally, lipids produced by Rhodosporidium toruloides Y4 from glucose or corn stover were also transformed to about 75 wt % of diesel-range alkane products. This integration of microbial lipid production with chemical catalysis should facilitate the engineering of green diesel production from lignocellulosic biomass.

CuO@NiO Nanoparticles Derived from Metal–Organic Framework Precursors for the Deoxygenation of Fatty Acids

“…Toward this end, noble-metal catalysts, such as Pt, − Pd, Ru, , and Rh, have been widely studied in-depth for green diesel production. However, their high cost remains a great obstacle to industrial application.…”

Visible‐Light Photoredox‐Catalyzed Hydrodecarboxylation and Deuterodecarboxylation of Fatty Acids

“…Herein, we describe visible-light photoredox-catalyzed decarboxylation of fatty acids for alkanes (C 9 -C 17 ) in up to 98% yield, as well as the efficient decarboxylative deuteration using D 2 O as the deuteration source (Scheme 1e). The key to the high efficiency should attribute to the co-catalysis of the suitable methoxy substituted acridine photocatalyst 3,6, and the efficient hydrogen donor catalyst 4,4-dimethyl diphenyldisulfane (4-Me-PhS) 2 , possibly via facilitating of quenching the active alkyl radicals to overcome the competitive homocoupling products, olefins via the disproportionation, cracking products via the C-C bond β-scission.…”

Catalytic deoxygenation of palm oil over metal phosphides supported on palm fiber waste derived activated biochar for producing green diesel fuel

“…9 Currently, catalytic deoxygenation for upgrading biomass feedstocks into green fuels was run over porous materials supported noble metals (e.g., palladium, platinum, and rhodium) catalysts, which is regularly employed as a commercial benchmark catalyst. [10][11][12] However, the utilization of noble metals is less economically attractive than transition metal-based catalysts: nickel, cobalt, iron, molybdenum in commercialization scale. Furthermore, supported noble metal catalysts in metallic form show the poor stability in long-term catalytic run that should be urgently encountered.…”