Deoxygenation of decanoic acid and its main intermediates over unpromoted and promoted sulfided catalysts

Inhibiting effect of decanoic acid and its by-products on the transformation of n-hexadecane over a Pt/SiO2-Al2O3 catalyst

“…The reaction scheme of the transformation of decanoic acid is in total agreement with the one established under different hydrotreatment operating conditions (hydrodesulfurization of gas oils and hydrodeoxygenation of liquid of biomass from pyrolysis). Indeed, the decanoic acid was mainly transformed by the decarbonylation and decarboxylation pathways over sulfided Ni(Co)Mo/Al 2 O 3 [30] or CoMoP/Al 2 O 3 [31] (T = 613 K, P = 4 MPa). CO and CO 2 were totally converted into methane and water by methanization reaction.…”

Deoxygenation of stearic acid with a novel Ni(CO)‐MoS2/Fe3S4 catalyst

“…This can be explained by the competitive adsorption of stearic acid, octadecanal, and octadecanol on the active sites of the catalyst in favour of the stearic acid. This inhibiting effect of carboxylic acids is shown in the conversion of decanal in the presence of decanoic acid and is also confirmed in a DFT study by Dupont et al showing stronger adsorption energy for propanoic acid (–0.65 eV) compared to that for propanal (–0.38 eV) over MoS 2 catalyst. This inhibiting effect was also reported in the transformation of dibenzothiophene in the presence of the carboxylic acid over CoMoP/Al 2 O 3 catalyst …”

“…Therefore, the C17 hydrocarbon products were formed either by decarbonylation of stearic acid and/or octadecanal. It is noteworthy to mention that formation of heptadecane through the decarbonylation of the aldehyde is found to be solely via thermal decomposition and non‐catalyzed …”

“…Octadecanol can go through deoxygenation by an elimination step to form 1‐octadecene and water or through hydrogenation and dehydration to form octadecane. Studies have shown that over the transition metal sulphide catalysts, the preferred route for both the aldehyde and alcohol intermediates is the HDO pathway . 1‐octadecene can undergo different isomerization steps by double bond shifting leading to 2‐octadecene and three other isomers, possibly 4, 5, and 7‐octadecene.…”

Hydrodeoxygenation of methyl palmitate over MCM-41 supported nickel phosphide catalysts

“…Hexadecanol could produce hexadecene by dehydration (step 4), and hexadecane could be generated from hexadecene by a hydrogenation (step 5) [26]. Palmitic acid could directly generate pentadecane by a decarbonation (step 9) [21]; it could also generate hexadecanal by dehydration (step 6) [6,27]. Hexadecanal could directly generate pentadecene by removel of the CO (step 7) [28], which could then be hydrogenated to produce pentadecane (step 8).…”