Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 14, Pages 4724-4733Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp23590k
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Funding
- Japan Society for the Promotion of Science [22360327]
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Global COE [B01]
- Grants-in-Aid for Scientific Research [22360327] Funding Source: KAKEN
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The formation and adsorption of CO from CO2 and H-2 at high pressures were studied over alumina-supported noble metal catalysts (Pt, Pd, Rh, Ru) by in situ FTIR measurements. To examine the effects of surface structure of supported metal particles and water vapor on the CO adsorption, FTIR spectra were collected at 323 K with untreated and heat (673 K) treated catalysts in the absence and presence of water (H2O, D2O). It was observed that the adsorption of CO occurred on all the metal catalysts at high pressures, some CO species still remained adsorbed under ambient conditions after the high pressure FTIR measurements, and the frequencies of the adsorbed CO species were lower either for the heat treated samples or in the presence of water vapor. It is assumed that the CO absorption bands on atomically smoother surfaces appear at lower frequencies and that water molecules are adsorbed more preferentially on atomically rough surfaces rather than CO species.
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