OP-II-3

PP-III-18SUPPORT INFLUENCE ON Ni-BASED CATALYSTS FORHYDRODEOXYGENATION REACTION OF BIOFUEL-PRECURSORSEcheandia S. 1 , Barrio V.L. 1 , Cambra J.F. 1 , Arias P.L. 1 , Güemez M.B. 1 ,Khromova S.A. 2 , Yakovlev V. 21 School of Engineering (UPV/EHU), c/ Alameda Urquijo s/n, 48013 Bilbao (Spain)jose.cambra@ehu.es2 Boreskov Institute of Catalysis SB RAS, Pr. Akad. Lavrentieva, 5, Novosibirsk,RussiaIntroductionBiomass is a renewable alternative to fossil raw materials for the production ofliquid fuels and chemicals. Pyrolized biomass liquid fractions contain oxygenatedmolecules that must be removed to improve the stability of these liquid fuelprecursors. A hydrotreating process, hydrodeoxygenation (HDO), is commonly usedfor this purpose [1]. Therefore study of their deoxygenation is a subject of interest.Phenol HDO is generally accepted to proceed via two parallel reaction pathways [2]:O-C bond cleavage giving aromatic products (direct hydrogenolysis), or aromatic ringhydrogenation before O-C bond cleavage (combined hydrogenation-hydrogenolysis).In the latter route, alicyclic products are formed and the corresponding alicyclicalcohols appear as short-lived intermediates [3]. The influence of catalystformulations and activations on those two HDO mechanisms will be fully discussed.The phenol, as a model compound, is used in order to screen different hydrotreatingcatalysts in HDO. The supports studied are: Al 2 O 3 , CeO 2 , ZrO 2 , ZrO 2 -CeO 2 .Experimental & Results and discussionActivity tests were carried out in a bench-scale fixed-bed catalytic reactor with 0.2 g ofcatalysts. Hydrogen and liquid feed were fed to the reactor in a molar ratio of 100:1 inH 2 : phenol. The experimental conditions were as follows: temperature in the range 423-573 K, total pressure of 1.5 MPa and space velocity of 0.5 g phenol /g catalyst·h correspondingto a model feed consisting of 1 wt% phenol and n-octane as solvent. The liquid productswere analyzed by off-line MSD for identification and FID for quantification.Steady-state conversion data for phenol HDO over reduced Ni-based catalystsare represented in Figure 1. These data are the average of conversion archivedduring 6 h of time on-stream. During this time the phenol conversion changes were