Preparation, characterization, and reactivity of Pt/SDBC catalysts for the hydrogen-water isotopic exchange reaction |
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Authors: | Seungwoo Paek Hongsuk Chung Seong Ihl Woo |
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Institution: | (1) Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute, 150 Dukjin-dong, Yusong-gu, 305-353 Taejon, Korea;(2) Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, 305-701 Taejon, Korea |
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Abstract: | Pt/SDBC catalysts, which are used for the hydrogen-water isotopic exchange reaction, were prepared. TGA experiments showed
that the treatment temperature of Pt/SDBC catalysts in inert gas is limited to 400 °C and the maximum allowable heat treatment
temperature in oxygen is 200 °C. From nitrogen adsorption and hydrogen chemisorption measurements, it was shown that the dispersion
of platinum particles depended on the physical properties, i.e., specific surface area and pore structure of SDBC. It was
found that the heat treatment could not impact the structure of SDBC and the oxygen treatment at 150 °C improved the platinum
dispersion. It was shown by XPS analysis that the oxygen treatment of impregnated Pt/SDBC increased the fraction of platinum
metal state and platinum dispersion. As the supported platinum area increases, the catalytic activity of Pt/SDBC for the hydrogen-water
vapor isotopic exchange reaction increases. It indicates that the hydrogen chemisorption measurement can be used to estimate
the catalytic activities of Pt/SDBC catalysts. It was not observed that the particle size of supported platinum affected the
specific reaction rate at 60 °C. It implies that this reaction is structure insensitive. |
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