On the mechanism of catalytic conversion of fatty acids into hydrocarbons in the presence of palladium catalysts on alumina

The influence of metal and carrier natures on the effectiveness of catalysts of the deoxygenation of fatty acids into hydrocarbons

“…Quantum chemical simulation of the mechanism of propionic acid decomposition on such a center at 623 K gave results that, in the main, did not differ from those described by us in [7] except stage 3b (figure). At this temperature, the reaction had a high activation energy ( kcal/mol).…”

“…RESULTS AND DISCUSSION It was shown in [1,7,14] that the high yields of hydrocarbons in the deoxygenation of fatty acids in the presence of palladium catalysts are reached when the reaction is run in the atmosphere of hydrogen. The transformation of SA into hydrocarbons predomi nantly occurs according to the scheme [7] R…”

“…It was shown in [7] that, at 298 K, the limiting stage of decar bonylation in the presence of palladium catalysts was the introduction of palladium into the C-C bond in R⎯ COOH, which resulted in the formation of the ⎯ COOH fragment linked by the Pd-C bond with the metallic center. The main reaction products were formed in the coordination sphere of this palladium complex.…”

“…The temperature was gradually increased to 120°С during 3 h, and the product was held at 120°С for 1 h. The carrier was then calcined in a muffle furnace at 500°С for 3 h. After this, palladium (0.5%) was deposited from a solution of palladium chloride in hydrochloric acid (the preparation proce dure is described above). Catalytic experiments were performed and prod ucts were analyzed as described in [7] in the atmo sphere of hydrogen at a 14 atm pressure 1 during 6 h at 300 or 350°С. Palladium and platinum catalysts were reduced at 200°С, and copper and nickel catalysts at 350°С.…”

Selective Deoxygenation of Biomass‐Derived Bio‐oils within Hydrogen‐Modest Environments: A Review and New Insights

“…DCO 2 releases oxygen as CO 2 and produces alkanes with one less carbon unit. DCO 2 effectively consumes no H 2 and has actually been shown to be inhibited by H 2 pressures that are too high ,. Unlike the HDO reaction pathway, the DCO x reaction pathways are overall endothermic reactions and generally favor increasing reaction temperatures, whereas HDO reactions may experience a decline in selectivity …”