The First Study on the Reactivity of Water Vapor in Metal-Organic Frameworks with Platinum Nanocrystals.

Authors :: Ogiwara N
Kobayashi H
Concepción P
Rey F
Kitagawa H
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2019 Aug 19; Vol. 58 (34), pp. 11731-11736. Date of Electronic Publication: 2019 Jul 22.
Publication Year :: 2019
Abstract: We first studied the reactivity of H <subscript>2</subscript> O 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 ZrO <subscript>2</subscript> . 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 H <subscript>2</subscript> O 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 H <subscript>2</subscript> O diffusion in UiO-66.<br /> (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

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