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Temperature-programmed reduction study on carbon-supported platinum-gold alloy catalysts
1Institute of Materials Science and Engineering, National Central University, No. 300, Jhongda Road, Chungli, Taoyuan 320, Taiwan.
Platinum-gold (Pt-Au) alloy catalysts were synthesized and analyzed using temperature-programmed reduction (TPR). The study found that increasing the platinum ratio in Pt-Au/C catalysts shifts the reduction temperature, indicating surface composition changes.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Platinum-gold (Pt-Au) alloy catalysts are crucial for various chemical reactions.
- Understanding the surface composition of these alloys is key to optimizing their catalytic activity.
- Previous studies have explored Pt-Au alloys, but detailed surface characterization under specific conditions remains an active research area.
Purpose of the Study:
- To synthesize Pt-Au/C alloy catalysts with varying Pt/Au ratios.
- To characterize the surface composition of these alloy catalysts using low-temperature temperature-programmed reduction (LT-TPR).
- To investigate the effect of Pt/Au ratio on the surface segregation behavior of Pt atoms.
Main Methods:
- Precipitation-deposition of metal chlorides followed by H(2) reduction at 470 K to prepare Pt-Au/C catalysts.
- Chemisorption of O(2) on reduced catalysts.
- Low-temperature temperature-programmed reduction (LT-TPR) in the range of 120-430 K to analyze surface composition.
- Characterization of monometallic Au/C and Pt/C catalysts for baseline comparison.
Main Results:
- Monometallic Au/C and Pt/C catalysts exhibited LT-TPR peaks at 145 K and 240 K, respectively.
- The reduction temperature (T(r)) for Pt-Au/C alloy catalysts varied between these values and increased monotonically with increasing Pt/Au ratio.
- Evidence suggests that interior Pt atoms segregate to the surface of alloy particles during high-temperature oxidation treatments.
Conclusions:
- The surface composition of Pt-Au/C alloy catalysts is strongly dependent on the overall Pt/Au ratio.
- LT-TPR is an effective method for probing the surface composition and segregation behavior in Pt-Au alloy catalysts.
- The observed segregation of Pt atoms highlights the dynamic nature of alloy surfaces under reaction-relevant conditions.
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