Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

OP-1-7DEOXYGENATION OF FATTY ACIDS AND THEIR ESTERSOVER PALLADIUM ON CARBON CATALYST: INVESTIGATIONOF REACTION MECHANISMBartosz Rozmysłowicz, Anton Tokarev, Päivi Mäki-Arvela, Dmitry Yu. MurzinProcess Chemistry Center, Åbo Akademi University, 20500 Turku, Finland,dmurzin@abo.fiProduction of biodiesel via deoxygenation of fatty acids and their esters havebeen of high interest over the last years [1]. It was shown that the bestdeoxygenation conversion and selectivity can be achieved over palladium on carboncatalyst at 300°C under hydrogen rich atmosphere, in which deoxygenation reactioncould proceed through three different pathways: decarboxylation, decarbonylationand hydrogenation of carboxylic group (Fig. 1). To investigate, which of thesemechanisms is predominant, depending on hydrogen presence, series ofexperiments with lauric acid, lauric aldehyde and dodecanol as well as with methyland ethyl esters of fatty acids, were carried out in hydrogen rich and in inertatmosphere.The experiments were performed in semibatch reactor at 300°C, over 5% Pd/Ccatalyst using hexadecane as a solvent. Catalyst was characterized by nitrogenadsorption and TEM leading to 380 m 2 /g of specific surface area and 2.4 nm ofaverage palladium clusters size. Liquid phase products were analyzed by GC andGC-MS, while gas phase products were analyzed with micro-GC.In the final work the effect of gas atmosphere on catalytic deoxygenation as wellas the reaction network will be discussed.+ +H OH 3 CCH 2CO 2C H 3OOH+ H 2+ 3H 2H 3 CCH 3CO 2H 3 CCH 3CO H 2 OCH 3H 3 C2H 2 O++ ++Fig. 1. Simplified reaction network for the catalytic deoxygenation of fatty acids.References:[1]. Murzin, D.Yu., Kubickova, I., Snåre, M., Mäki-Arvela, P., Myllyoja, J., Method for the manufactureof hydrocarbons, WO 2006075057, 2006, pp. 21. US Patent 7, 491,858 2009.30