Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-V-10Catalyst preparationA series of ZnO-supported Co-Mn catalysts have been prepared by co-precipitation andby impregnation in order to study the influence of the preparation method. Samples have beencalcined at 673 K and reduced at 673 K with a gaseous stream containing 10% H 2 . Catalyticmonoliths (cordierite) have been prepared by conventional washcoating methods.Catalysts characterizationCatalysts have been studied by X-ray diffraction, temperature programmed reduction,high resolution transmission electron microscopy, electron energy loss spectroscopy, andX-ray photoelectron spectroscopy. The existence of bimetallic Co-Mn particles has beenevidenced. The adherence of catalyst coatings on cordierite monoliths has been evaluated, andcatalyst dispersion and homogeneity inside monolith channels have been studied by scanningelectron microscopy and confocal microscopy.Catalytic testsESR has been carried out at atmospheric pressure in a tubular reactor with aC 2 H 5 OH:H 2 O=1:6 molar mixture balanced in inert gas. A continuous flow of ethanol(0.33 mL min –1 C 2 H 5 OH) and water were provided separately and mixed before entering thereactor. Reactants and products were analyzed on line either by gas chromatography or bymass spectrometry. WGS has been performed using a CO:H 2 :H 2 O=1:2:6 molar mixture.Co-Mn/ZnO catalysts are active for WGS under ESR conditions, and this affects positively onthe hydrogen yield in ESR. Catalytic monoliths coated with a catalyst containing 10%Co and1%Mn produce 5.7 mol H 2 /mol ethanol at 723 K.AcknowledgmentsFinancial support from MEC (ENE2006-06925) is acknowledged.References1. Llorca J., Ramírez de la Piscina P., Sales J., Homs N., Chem Commun, 2001;641-642.2. Vaidya P.D., Rodrigues A.E. Chem Eng J 2006;117:39-49.3. Haryanto A., Fernando S., Murali N., Adhikari S. Energy Fuels 2005;19:2098-2106.4. Llorca J., Homs N., Sales J., Ramírez de la Piscina P. J Catal 2002;209:306-317.5. Torres J.A., Llorca J., Casanovas A., Domínguez M., Salvadó J., Montané D. J Power Sources,2007;169:158-166.186