OP-II-3

PP-III-51The SRM reaction was carried out in a conventional flow reactor at atmosphericpressure. All runs were performed using 0.1 g of catalyst diluted with 0.9 g sand, withno reduction pretreatment, under a reactant flow rate of 100 cm 3min –1 . Thecomposition of the reaction gas was 5% MeOH, 7.5% H 2 O in He. Gases in theeffluent were analyzed by a Shimadzu GC-2014 equipped with TCD and FID.Results and discussionThe surface area of all combustion-prepared catalysts was smaller than 9 m 2 g –1 .XRD analysis of fresh catalysts revealed that most of the diffraction peakscorrespond to support phases (ZrO 2 or CeO 2 ), while peaks of the Co 3 O 4 phase werealso present. XRD peaks due to CeO 2 oxide were not detected, most probably due toincorporation of ceria in the zirconia lattice. On the other hand, cobalt catalystsprepared by MSM had much higher surface area (Co/CeO 2 -ZrO 2 : 140 m 2 /g), butCeO 2 was detected as a separate phase in the Co/CeO 2 -ZrO 2 sample.From the combustion synthesized samples, Co/CeO 2 -ZrO 2 prepared with 200%urea excess had the best catalytic behaviour (100% MeOH conversion at 425 °C),while all the samples were more selective towards CO production than CO 2 . Moltensalt method resulted in more active (100% MeOH conversion at 400 °C) catalysts.The reaction pathway appears to consist of methanol decomposition followed by thewater-gas shift reaction.ConclusionsIn this study Co-Ce-Zr catalysts were prepared via a) the combustion and b) themolten salts method and tested for the SRM reaction. The resulting materialcharacteristics were influenced by the urea/nitrate molar ratio used in the combustionsynthesis and the water addition during the molten salts method. The latter methodresulted in more active SRM catalysts.References[1]. S.S.-Y. Lin, S.Y. Ha, D.H. Kim, Catal. Lett. 122 (2008) 295-301.[2]. H. Song, U.S. Ozkan, J. Catal. 261 (2009) 66–74.[3]. J. Papavasiliou, G. Avgouropoulos, T. Ioannides, Catal. Commun. 6 (2005) 497-501.[4]. P. Afanasiev, C. Geantet, Coordin. Chem. Rev. 178–180 (1998) 1725–1752.534