OP-II-3

PP-III-401% w/w for Pd with respect to the support. The resulting catalytic monoliths weredried under continuous rotation at 373 K for 2 h and calcined in air at 773 K for 5 h.Catalysts characterizationX-ray diffraction has been used to study the possibility of alloy formation betweenCu-Zn, Cu-Pd or Zn-Pd. The surface composition of the catalysts has beendetermined by X-ray photoelectron spectroscopy.Catalytic testsDME steam reforming has been carried out at atmospheric pressure using aconventional flow reactor (20 mm ID). Prior to reaction, catalytic monoliths have beenactivated at 573 K with a 10% H 2 /N 2 mixture for 1 h. A DME:H 2 O=1:3 (molar)gaseous mixture balanced in N 2 has been passed through the reactor at 473-723 Kunder a GHSV of 1300 h –1 . DME steam reforming has also been studied without N 2dilution with a liquid pump. Reactants and products have been analyzed on-linecontinuously with a gas micro-chromatograph. It is deduced that the activity of thecatalysts increases due to Pd addition; however, the yield of hydrogen, the CO 2 /COratio and the presence of by-products is strongly influenced by the different catalystformulation tested.References[1]. K. Faungnawakij, Y. Tanaka, N. Shimoda, T. Fukunaga, S. Kawashima, R. Kikuchi, K. Eguchi;Appl. Catal. A: Gen., 2006, 304, 40-48.[2]. S. D. Badmaev, P. V. Snytnikov; Int. J. Hydrogen Energy, 2008, 33, 3026-3030.[3]. T. Mathew, Y. Yamada, A. Ueda, H. Shioyama, T. Kobayashi, C. S. Gopinath, Appl. Catal. A:Gen., 2006, 300, 58-66.[4]. M. Nilsson, K. Jansson, P. Jozsa, L. J. Pettersson; Appl. Catal. B: Environ., 2009, 86, 18-26.[5]. C. Ledesma, J. Llorca; Chem. Eng. J. (Amsterdam, Neth.), 2009, 154(1-3), 281-286.AcknowledgementsFinancial support from MICINN through grant CTQ2009-12520 is acknowledged.515