Details

Autor(en) / Beteiligte

• Ogiwara, Naoki
• Kobayashi, Hirokazu
• Inukai, Munehiro
• Nishiyama, Yusuke
• Concepción, Patricia
• Rey, Fernando
• Kitagawa, Hiroshi

Titel

Ligand-Functionalization-Controlled Activity of Metal–Organic Framework-Encapsulated Pt Nanocatalyst toward Activation of Water

Ist Teil von

• Nano letters, 2020-01, Vol.20 (1), p.426-432

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We first report the systematic control of the reactivity of H2O vapor in metal–organic frameworks (MOFs) with Pt nanocrystals (NCs) through ligand functionalization. We successfully synthesized Pt NCs covered with a water-stable MOF, UiO-66 (Pt@UiO-66), having different metal ions or functionalized ligands. The ligand functionalization of UiO-66 significantly affected the catalytic performance of the water–gas shift reaction, and the replacement of Zr4+ ions with Hf4+ ions in UiO-66 had no impact on the catalytic activity. The introduction of a −Br group lowered the reactivity of Pt@UiO-66 by nearly half, whereas the substitution of −Br with a −Me2 group triply enhanced the activity. The origin of the enhanced catalytic activity was found to be the change in H2O activity in the UiO-66 pores by the ligand functionalization, which was investigated using H2O sorption, solid-state NMR, X-ray photoelectron spectroscopy, and in situ IR measurements. This work opens a new prospect to develop MOFs as a platform to activate H2O.