Hardian Rifan, Dissegna Stefano, Ullrich Aladin, Llewellyn Philip L, Coulet Marie-Vanessa, Fischer Roland A
CNRS, MADIREL (UMR 7246), Aix-Marseille University, Campus St Jérôme, 13013, Marseille, France.
Chair of Inorganic and Metal-Organic Chemistry, Catalysis Research Center, Dept. of Chemistry, Technical University of Munich, Ernst-Otto-Fischer-Straße 1, 85748, Garching, Germany.
Chemistry. 2021 Apr 16;27(22):6804-6814. doi: 10.1002/chem.202005050. Epub 2021 Mar 16.
Defect engineering and metal encapsulation are considered as valuable approaches to fine-tune the reactivity of metal-organic frameworks. In this work, various MOF-808 (Zr) samples are synthesized and characterized with the final aim to understand how defects and/or platinum nanoparticle encapsulation act on the intrinsic and reactive properties of these MOFs. The reactivity of the pristine, defective and Pt encapsulated MOF-808 is quantified with water adsorption and CO adsorption calorimetry. The results reveal strong competitive effects between crystal morphology and missing linker defects which in turn affect the crystal morphology, porosity, stability, and reactivity. In spite of leading to a loss in porosity, the introduction of defects (missing linkers or Pt nanoparticles) is beneficial to the stability of the MOF-808 towards water and could also be advantageously used to tune adsorption properties of this MOF family.
缺陷工程和金属封装被认为是微调金属有机框架反应活性的重要方法。在这项工作中，合成并表征了各种MOF-808（Zr）样品，最终目的是了解缺陷和/或铂纳米颗粒封装如何影响这些金属有机框架的固有和反应特性。通过水吸附和CO吸附量热法对原始、有缺陷和Pt封装的MOF-808的反应活性进行了量化。结果表明，晶体形态和缺失连接体缺陷之间存在强烈的竞争效应，进而影响晶体形态、孔隙率、稳定性和反应活性。尽管会导致孔隙率损失，但引入缺陷（缺失连接体或Pt纳米颗粒）有利于MOF-808对水的稳定性，也可有利地用于调节该MOF家族的吸附特性。
