Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 48, Pages 25083-25092Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm32276e
Keywords
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Funding
- DOE, Office of Basic Energy Sciences [DE-FG02-05ER15732]
- AFOSR MURI grant [FA9550-08-0309]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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In this paper, we present a direct one-step synthesis of Pt-Co-SWCNT from the catalytic CO disproportionation over Pt-Co-MCM-41 catalysts with different Pt loadings. The SWCNT produced by Pt-Co-MCM-41 shows higher yield than the SWCNT produced by Co-MCM-41 under the same reaction conditions, and also SWCNTs with diameter larger than 2 nm have been identified in the products. X-ray absorption and temperature programmed reduction studies indicate that Pt exists as metallic nanoparticles in the Pt-Co-MCM-41 catalysts, while Co is atomically dispersed and tetrahedrally coordinated in the MCM-41 framework as a Co2+ cation. Detailed structural study also suggested that in the Pt-Co-SWCNT hybrids produced by this method, the Pt-Co bimetallic nanoparticles consist of a Pt core and Co shell with no detectable alloy phase. This study provides a method for the direct synthesis of a Pt-M-CNT catalyst, where M is a non-precious metal.
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