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- W2049014768 abstract "Successive temperature-programmed desorption (TPD) after temperature-programmed reduction (TPR) (Combined TPR-TPD) was performed in order to characterize supported platinum catalysts (Pt/SiO2, Pt/Al2O3, Pt/ZrO2 and Pt/TiO2) as well as to judge the validity of the apparent TPR profiles. In successive H2-TPD runs obtained after cooling in the absence of hydrogen from 450°C to room temperature, the hydrogen desorption peak was observed only for the Pt/TiO2 sample, indicating that the hydrogenic species were kept on Pt/TiO2 sample, while no hydrogenic species were retained on the other samples after TPR up to 450°C. For both Pt/Al2O3 and Pt/TiO2 samples, hydrogen spillover seemed to proceed. Hydrogen incorporation during TPR was greater for Pt/TiO2 than for the others. This hydrogen spillover causes an overestimation of the consumed H2/Pt value determined by the apparent TPR profile for Pt/TiO2. For Pt/SiO2 and Pt/ZrO2 samples, the apparent TPR profiles were mostly due to a reduction of the supported Pt oxides. For the Pt/TiO2 sample, the hydrogen incorporation/emission at different temperatures during TPR was investigated. To generate SMSI states, desorption of the spiltover hydrogen is suggested to play a significant role; the role of hydrogen incorporation/emission in the generation of SMSI states is also discussed." @default.
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- W2049014768 date "1991-08-01" @default.
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- W2049014768 title "Combined Temperature-Programmed Reduction (TPR)- Temperature-Programmed Desorption (TPD) Study of Supported Platinum Catalysts" @default.
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- W2049014768 doi "https://doi.org/10.1246/bcsj.64.2422" @default.
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