A highly efficient potassium-treated Au–Cu/Al2O3 catalyst for the preferential oxidation of carbon monoxide
| Autor: | Yu-Xin Miao, Lei Shi, Wen-Cui Li, Qiang Sun |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Diffuse reflectance infrared fourier transform
Chemistry General Chemical Engineering Analytical chemistry chemistry.chemical_element Proton exchange membrane fuel cell 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Copper 0104 chemical sciences Catalysis chemistry.chemical_compound Adsorption Chemical engineering Scanning transmission electron microscopy 0210 nano-technology Selectivity Carbon monoxide |
| Zdroj: | RSC Advances. 6:24603-24609 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c5ra21119k |
| Popis: | At the operating temperature (80–120 °C) of a proton exchange membrane fuel cell (PEMFC), high-efficiency elimination of CO while minimizing the H2 consumption processes is highly desired but still remains a challenge. In the present manuscript, one novel potassium-treated Au–Cu/Al2O3 catalyst was synthesized via a two step deposition–precipitation (DP) method with excellent catalytic performance for preferential oxidation of CO (CO-PROX) in a H2-rich stream. This catalyst exhibits 100% CO conversion over a wide temperature window of 60–110 °C and ≥50% selectivity of CO2 under the PEMFC operating temperature. Furthermore, the as-prepared potassium-treated Au–Cu/Al2O3 catalysts were also characterized by N2 adsorption analysis, scanning transmission electron microscopy (STEM)-energy dispersive X-ray spectroscopy (EDX), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), and the reasons for enhanced catalytic activity of the potassium-treated sample were elucidated. The introduction of copper could strengthen the CO adsorption on the Au–Cu/Al2O3 catalyst and potassium treatment could significantly increase the stability of active Cu+ species that contribute to enhanced catalytic performance. |
| Databáze: | OpenAIRE |
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