Journal
JOURNAL OF POWER SOURCES
Volume 202, Issue -, Pages 200-208Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.11.044
Keywords
Hydrogen purification; CO preferential oxidation; Platinum; Cobalt; Carbon nanotube
Funding
- National Basic Research Program of China [2011CBA00508]
- Natural Science Foundation of China [20923004, 21173175]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1036]
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Carbon nanotube-supported Pt-Co bimetallic catalysts (Pt-Co/CNTs) are prepared for preferential oxidation of CO in a H-2-rich stream. The results indicate that the addition of Co into the Pt/CNT catalyst significantly improves catalytic performance, making it superior to other carriers supporting the same composition of Pt-Co. Optimized bimetallic Pt-Co/CNT catalyst can preferentially oxidize dilute CO in a H-2-rich stream at a wide temperature window of 313-433 K. At a temperature of 353 K and a H-2-rich stream with 1% CO, 0.7-0.8% 02, 20% H2O, 25% CO2 and 50% H-2 balanced with N-2, this catalyst can afford 100% CO conversion with 62-71% O-2 selectivity for over 100 h. The transmission electron microscopic images reveal that the metal nanoparticles are uniformly dispersed on the surfaces of CNTs with an average size of approximately 2-3 nm, independent of Co loading. The results of X-ray photoelectron spectroscopy and nanoscale elemental mapping indicate that most of Co species are in the form of CoO, presenting on the Pt domain. Higher performance of the Pt-Co/CNT is attributed to the interactions between the Pt nanoparticles and CoO, those are supported on CNT surfaces. (C) 2011 Elsevier B.V. All rights reserved.
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