论文部分内容阅读
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.
X-ray absorption spectroscopy (XAS) provides important information for the structural and electronic properties of supported single site (mono- or mononuclear metal-complex) catalysts.Although XAS technology can characterize true reaction conditions without the need for long-range ordered structures Catalyst, and can provide very important metal-support interface information for supported single-site catalysts; however, the information it gives is average information for all supported metal species, including or not related to catalysis.The accurate characterization of supported catalysts has the Long-term challenges, but also limits our accurate understanding of the structure-activity relationship of the catalyst.In order to make better use of XAS characterization technology, in-depth study of the structure-activity relationship of the catalyst, and ultimately its design and development with the guidance of efficient catalysts to prepare a uniform structure Active site supported single site catalysts and their characterization by XAS and related technologies is of crucial importance.This article gives some examples to illustrate the ability of XAS to characterize supported single site catalysts with uniform structurally active sites and how XAS And other technologies (such as scanning transmission electron microscopy and infrared spectroscopy) complementary to molecular sieve and metal - Supported single-site catalysts with homogeneous structure-active sites made from organic framework materials provide atomic-scale information.