Journal
CHEMCATCHEM
Volume 7, Issue 15, Pages 2346-2353Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201500320
Keywords
cobalt; fuel cells; nanostructures; oxidation; surface chemistry
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Funding
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-12ER16353]
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Driven by the development of a catalyst made of earth-abundant elements for on-board purification of H-2 of this energy conversion technology, preferential oxidation (PROX) on pure Co3O4 nanorods and Co3O4 nanorods with supported Pt nanoparticles was explored with the aid of insitu studies. This catalyst remains its 100% conversion of CO in H-2 at a gas hourly space velocity of 42857mLh(-1)g(-1) at 120 degrees C for at least 96h. Insitu studies showed that the active surface phase during PROX is nonstoichiometric Co3O4-x. A correlation between density of surface oxygen vacancies and conversion of CO to CO2 suggest that oxygen vacancy is a necessary component of a catalytic site for PROX on Co3O4-x. Compared to pure Co3O4 nanorods, anchoring Pt nanoparticles on Co3O4 nanorods unfortunately increases selectivity for oxidation of H-2 owing to the low dissociation barrier of molecular H-2 on Pt. Co3O4-x exhibits much higher selectivity for CO oxidation in PROX than Pt/Co3O4-x at a temperature lower than 140 degrees C.
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