研究目的
Investigating the thermal stability of bimetallic Pd–Rh/Al2O3 three-way catalysts using optical spectroscopy methods.
研究成果
Optical spectroscopy methods, including luminescence and UV–Vis spectroscopies, are effective for diagnosing the thermal stability of bimetallic Pd–Rh/Al2O3 catalysts. The study highlights the importance of preparation techniques and support composition in enhancing catalyst stability.
研究不足
The study is limited to the use of optical spectroscopy methods for assessing thermal stability, which may not capture all aspects of catalyst deactivation.
1：Experimental Design and Method Selection
The study involved the preparation of bimetallic Pd–Rh/Al2O3 catalysts by incipient wetness impregnation, followed by characterization using UV–Vis and luminescence spectroscopies to assess thermal stability.
2：Sample Selection and Data Sources
Commercial γ-Al2O3 Puralox TH 100/150 and γ-Al2O3 Puralox TH 100/150 L4 were used as supports. Catalysts were prepared with Pd and Rh loadings of 0.12 and 0.08 wt%, respectively.
3：List of Experimental Equipment and Materials
UV–Vis spectrometer UV–VIS 2501 PC (Shimadzu), Cary Eclipse spectrofluorimeter (Varian), mass-spectrometer GMS-200, gas analyzer ULTRAMAT 6 (Siemens).
4：Experimental Procedures and Operational Workflow
Catalysts were tested under stoichiometric and reductive conditions, followed by prompt thermal aging. Optical spectroscopy methods were used to monitor changes in the catalysts.
5：Data Analysis Methods
Diffuse reflectance UV–vis spectra were analyzed using the Kubelka–Munk function. Luminescence spectroscopy was used to detect Rh3+ ions in the catalysts.
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