Chai Yuchao, Shang Weixiang, Li Weijie, Wu Guangjun, Dai Weili, Guan Naijia, Li Landong
School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 China.
Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering Nankai University Tianjin 300071 China.
Adv Sci (Weinh). 2019 Jul 18;6(16):1900299. doi: 10.1002/advs.201900299. eCollection 2019 Aug 21.
Noble metal nanoparticles or subnanometric particles confined in zeolites, that is, metal@zeolite, represent an important type of functional materials with typical core-shell structure. This type of material is known for decades and recently became a research hotspot due to their emerging applications in various fields. Remarkable achievements are made dealing with the synthesis, characterization, and applications of noble metal particles confined in zeolites. Here, the most representative research progress in metal@zeolites is briefly reviewed, aiming to boost further research on this topic. For the synthesis of metal@zeolites, various strategies, such as direct synthesis from inorganic or ligand-assisted noble metal precursors, multistep postsynthesis encapsulation and ion-exchange followed by reduction, are introduced and compared. For the characterization of metal@zeolites, several most useful techniques, such as electron microscopy, X-ray based spectroscopy, infrared and fluorescence emission spectroscopy, are recommended to check the successful confinement of noble metal particles in zeolite matrix and their unique physiochemical properties. For the applications of metal@zeolites, catalysis and optics are involved with an emphasis on catalytic applications including the size-dependent catalytic properties, the sintering-resistance properties, the substrate shape-selective catalysis, and catalysis modulation by zeolite microenvironment.
限制在沸石中的贵金属纳米颗粒或亚纳米颗粒，即金属@沸石，是一种具有典型核壳结构的重要功能材料。这类材料已为人所知数十年，近来因其在各个领域的新兴应用而成为研究热点。在处理限制在沸石中的贵金属颗粒的合成、表征及应用方面已取得显著成就。在此，简要综述了金属@沸石最具代表性的研究进展，旨在推动对该主题的进一步研究。对于金属@沸石的合成，介绍并比较了各种策略，如从无机或配体辅助的贵金属前驱体直接合成、多步合成后封装以及离子交换后还原。对于金属@沸石的表征，推荐了几种最有用的技术，如电子显微镜、基于X射线的光谱学、红外和荧光发射光谱学，以检查贵金属颗粒是否成功限制在沸石基质中及其独特的物理化学性质。对于金属@沸石的应用，涉及催化和光学，重点是催化应用，包括尺寸依赖性催化性能、抗烧结性能、底物形状选择性催化以及沸石微环境对催化的调节作用。
