OP-II-3

PP-III-25functionalized silicon micromonoliths were characterized by scanning electronmicroscopy, focused ion beam, transmission electron microscopy, X-rayphotoelectron spectroscopy and X-ray diffraction.Catalytic testsBefore catalytic testing, the catalytic layer was activated by thermal treatment at473 K for 2 h with a temperature gradient of 2 K min –1 under a carbon monoxide-airmixture diluted in argon (CO:Air molar ratio 1.3:6, contact time 0.15 s). For catalytictesting, silicon micromonoliths were glued with epoxy into stainless steel washers(external diameter 19 mm, internal diameter 7 mm), which were then incorporatedwithin a stainless steel housing inside a furnace. Catalytic tests were carried outunder different concentrations of H 2 , CO and air in the inlet mixture. The H 2 :CO molarratio was varied from 1:1 to 20:1 to infer the influence of H 2 on the COPROX reactionsimulating fuel cell operation. An equimolar ratio O 2 :CO in feed was mantained in allexperiences. Reaction tests were performed at 363 and 398 K.13 mm3.3μmFig. 1. Functionalized silicon micromonolith (left). Regular array of circular channelswith depth/diameter ratio >65 (center). Detail of the reproducible channelsof 3.3 μm in diameter (right).For an inlet mixture H 2 :CO~20:1, CO conversions were ca. 20 and 33% at 363and 398 K, respectively. The latter represents ~1 NmL CO converted per minute andper mL of microreactor. After ca. 65 h under reaction no deactivation was observed.References[1] O. Korotkikh, R. Farrauto; Catal. Today: 2000, 62, 249.[2] J. Llorca, A. Casanovas, T.Trifonov, A. Rodríguez, R. Alcubilla; J. Catal: 2008, 228-233.[3] E. López, A. Irigoyen, T. Trifonov, A. Rodríguez, J.Llorca; Int. J. Hyd. Energy, 2010, in press.[4] M. Haruta, M. Daté; Appl. Catal. A, 2001, 222, 427-437.AcknowledgementsFinancial support from MICINN (CTQ2009-12520 and TEC2008-02520) isacknowledged. N.J. is grateful to UPC for a PhD grant.486