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The First Study on the Reactivity of Water Vapor in Metal–Organic Frameworks with Platinum Nanocrystals
Author(s) -
Ogiwara Naoki,
Kobayashi Hirokazu,
Concepción Patricia,
Rey Fernando,
Kitagawa Hiroshi
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201905667
Subject(s) - catalysis , reactivity (psychology) , platinum , nanocrystal , water gas shift reaction , chemistry , metal organic framework , water vapor , metal , chemical engineering , inorganic chemistry , materials science , nanotechnology , organic chemistry , adsorption , medicine , alternative medicine , pathology , engineering
We first studied the reactivity of H 2 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 2 . 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 2 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 2 O diffusion in UiO‐66.