Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 34, Pages 11731-11736Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201905667
Keywords
heterogeneous catalysts; platinum nanocrystals; metal-organic frameworks; water; water-gas shift reaction
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Funding
- JST PRESTO [JPMJPR1514]
- JSPS [17750056, 17J10099]
- Spanish Government-MINECO through Severo Ochoa Excellence Programme [SEV-2016-0683]
- Grants-in-Aid for Scientific Research [17J10099, 17750056] Funding Source: KAKEN
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We first studied the reactivity of H2O vapor in metal-organic frameworks (MOFs) with Pt nanocrystals (NCs) through the water-gas shift (WGS) reaction. A water-stable MOF, UiO-66, serves as a highly effective support material for the WGS reaction compared with ZrO2. The origin of the high catalytic performance was investigated using in situ IR spectroscopy. In addition, from a comparison of the catalytic activities of Pt on UiO-66, where Pt NCs are located on the surface of UiO-66 and Pt@UiO-66, where Pt NCs are coated with UiO-66, we found that the competitive effects of H2O condensation and diffusion in the UiO-66 play important roles in the catalytic activity of Pt NCs. A thinner UiO-66 coating further enhanced the WGS reaction activity of Pt NCs by minimizing the negative effect of slow H2O diffusion in UiO-66.
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