采用X射线吸收光谱表征单原子催化剂:至关重要与持久挑战（英文）

发布时间：2018-06-01 06:13

  本文选题：负载型催化剂 + X射线吸收光谱　； 参考：《催化学报》2017年09期

【摘要】：X射线吸收光谱(XAS)可为负载型单中心(单原子或单核金属络合物)催化剂的结构和电子特性提供重要信息.虽然XAS技术可表征真实反应条件下、无需长程有序结构的催化剂,并且可提供对于负载型单中心催化剂非常重要的金属-载体界面信息;但是它给出的信息是包括与催化有关或无关的所有负载型金属物种的平均信息.负载型催化剂的准确表征具有长期挑战性,也限制了我们准确地理解催化剂的构效关系.为了更好地利用XAS表征技术,深入研究催化剂的构效关系,并最终用其指导设计开发出高效的催化剂,制备具有均一结构活性位的负载型单中心催化剂,并采用XAS及相关技术对其表征至关重要.本文列举了一些实例以说明XAS在表征具有均一结构活性位的负载型单中心催化剂方面的能力,以及XAS如何与其他技术(如扫描透射电子显微镜和红外光谱)互补,为以分子筛和金属-有机骨架材料为载体而制得的具有均一结构活性位的负载型单中心催化剂提供原子尺度的信息.
[Abstract]:X-ray absorption spectroscopy (XAS) can provide important information for the structure and electronic properties of supported mono-center (monoatomic or mononuclear metal complex) catalysts. Although the XAS technique can characterize the catalyst without long order structure under the real reaction conditions, it can provide the metal-carrier interface information which is very important for the supported single-center catalyst. But it gives information that includes the average information for all supported metal species that are or are not related to catalysis. The accurate characterization of supported catalysts is challenging for a long time, which limits us to understand the structure-activity relationship of catalysts accurately. In order to make better use of XAS characterization technology, the structure-activity relationship of the catalyst was deeply studied, and finally, the highly efficient catalyst was designed and developed with its guidance, and the supported single-center catalyst with homogeneous active site was prepared. XAS and related techniques are very important for its characterization. Examples are given to illustrate the ability of XAS to characterize supported monocentric catalysts with homogeneous active sites, and how XAS complements other techniques, such as scanning transmission electron microscopy and infrared spectroscopy. It provides atom-scale information for the supported monocentral catalysts with homogeneous active sites prepared from molecular sieves and metal-organic skeleton materials.
【作者单位】： 北海道大学工程研究生院应用化学部;
【分类号】：O643.36
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本文编号：1963139