Skip to main content Accessibility help

Enhanced CO Oxidation Catalysis of Pt0.1Cu0.9/Fe2O3 Synthesized by Radiolytic Process

  • Takao A. Yamamoto (a1), Ryota Kitagawa (a1), Satoshi Seino (a1) and Takashi Nakagawa (a1)


Catalysts in which Pt and Cu are immobilized on support particles of γ-Fe2O3 were synthesized by the radiolytic process and were evaluated for CO oxidation in a gas flow mixture (1% CO, 0.5% O2, 67.2% H2 and N2 balance) by measuring the CO concentration in the outlet gas. The Pt/Cu atomic ratios of the as-synthesized catalysts were determined to be 100:0, 90:10, 78:22, 50:50, 21:79, and 11:89, and the total metal loadings determined by chemical analyses were 10 wt%. Material characterization was performed using X-ray diffraction, X-ray absorption near edge structure, and transmission electron microscopy, and it was indicated that the composite catalysts consist of Pt-Cu bimetallic grains immobilized on the support at higher Pt-loading, while CuO with poor crystallinity is also observed at lower Pt-loading. The catalytic activity decreased as the Pt-loading was decreased to 50 at%, and also with increasing temperature. However, as the Pt-loading was further decreased, the activity contrariwise increased, and increased with increasing temperature up to 100 °C. The sample containing only 11 at% Pt exhibited the highest activity at 100 °C, which is higher than that of the commercial catalyst measured for comparison, and given at a lower temperature than that for the commercial catalyst. This enhanced activity, despite the low Pt-loading, could be attributed to oxygen supply via CuO from the O2-poor atmosphere to PtCu bimetallic grains trapping CO molecules. This new material is promising for use as a catalyst to purify hydrogen gas fed to a polymer electrolyte fuel cell.



Hide All
1. Ghenciu, A. F., Curr. Opin. Solid State Mater. Sci., 6(5) (2002) 389399.
2. Nilekar, A. U., Alayoglu, S., Eichhorn, B., Mavrikakis, M. J. Am. Chem. Soc., 132(21) (2010) 74187428.
3. Yamamoto, T. A., Nakagawa, T., Seino, S., Nitani, H., Applied Catalysis A: General, 387 (2010) 195202.
4. Yamamoto, T. A., Nakagawa, T., Seino, S., Nitani, H., Mat. Res. Soc. Symp. Proc., 1217 (2010), 6570.
5. Seino, S., Kinoshita, T., Nakagawa, T., Kojima, T., Taniguchi, R., Okuda, S. and Yamamoto, T. A., J. Nanoparticle Res., 10 (2008)10711076.
6. Seino, S., Kinoshita, T., Otome, Y., Okitsu, K., Nakagawa, T. and Yamamoto, T. A., Chem. Lett., 32 (2003) 690691
7. Belloni, J., Catalysis Today, 113 (2006) 141156.
8. Nitani, H., Nakagawa, T., Daimon, H., Kurobe, Y., Ono, T., Honda, Y., Koizumi, A., Seino, S., Yamamoto, T.A., Appl. Catal. A: Gen. 326 (2007) 194201.



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed