Rapid room-temperature synthesis of a porphyrinic MOF for encapsulating metal nanoparticles
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Rapid room-temperature synthesis of a porphyrinic MOF for encapsulating metal nanoparticles Huihui He1, Luyan Li3, Yang Liu1, Meruyert Kassymova3, Dandan Li2 (), Liangliang Zhang1 (), and Hai-Long Jiang3 Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), Xi'an 710072, China 2 Institutes of Physics Science and Information Technology, Anhui University, Hefei 230601, China 3 Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China 1
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 23 July 2020 / Revised: 25 August 2020 / Accepted: 26 August 2020
ABSTRACT While metal nanoparticles (NPs) have shown great promising applications as heterogeneous catalysts, their agglomeration caused by thermodynamic instability is detrimental to the catalytic performance. To tackle this hurdle, we successfully prepared a functional and stable porphyrinic metal-organic framework (MOF), PCN-224-RT, as a host for encapsulating metal nanoparticles by direct stirring at room temperature. As a result, Pt@PCN-224-RT composites with well-dispersed Pt NPs can be constructed by introducing pre-synthesized Pt NPs into the precursor solution of PCN-224-RT. Of note, the rapid and simple stirring method in this work is more in line with the requirements of environmental friendly and industrialization compared with traditional solvothermal methods.
KEYWORDS metal nanoparticles, room temperature and rapid synthesis, PCN-224, Ostwald ripening
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Introduction
Metal nanoparticles (MNPs), particularly in small sizes, have attracted great attention due to their advantages in heterogeneous catalysis [1, 2]. However, small MNPs with high surface energy are generally thermodynamically unstable and have a tendency towards agglomeration, which leads to the decrease of catalytic performance [3, 4]. In the past decades, numerous strategies have been proposed to prevent agglomeration of MNPs, among which encapsulation of MNPs into porous materials, such as porous silica, zeolites and metal-organic frameworks (MOFs), could be one of the most effective methods [5–7]. Porous materials can not only benefit the dispersion of MNPs, but also favor the mass transfer of the substrates and products in the catalytic process. Therefore, the encapsulation of MNPs in porous materials for catalysis has been a research hotspot in chemical and material science. As an emerging porous crystalline material, MOFs possess adjustable pore structures and very high surface areas [8–15]. The unique features of MOFs make them ideal hosts and supports for MNPs, which lead to synergistically enhanced catalysis [16–18]. The general approach to prepare MNPs@MOFs composites is the impregnation of metal precursors into MOFs with various techniques, including solution infilt
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