Publication date: 4th December 2020
The advantages of using X-ray absorption spectroscopy (XAS) to probe the local structure of a working catalyst are well-established, and the technique is widely applied. At Stanford Synchrotron Radiation Lightsource (SSRL) we have recently developed the infrastructure that is required to conduct these experiments over a broad range of thermal heterogeneous catalytic conditions. In this talk I will summarize the path we have taken to achieve this user-accessible capability, which is a foundation from which we plan to develop and implement new capabilities. To illustrate the current capabilities, I will present several applications from our collaborative research using operando XAS: Co/TiO2 Fischer-Tropsh catalysts, single atom catalysts, and higher alcohol synthesis catalysts. Looking to the future, I will touch on the new capabilities that we are developing, include quick scanning XAS, combined FTIR/XAS, and modulation excitation methods, all which offer improvement to identifying the active site or higher degree of sensitivity to minority species. Concomitant with these advancements is the need to develop improved sample environments, improved data processing and analysis methods (coupled with theory), and the continual demand for higher throughput studies, and now, of course, remote access. While we cannot always definitively conclude from these operando XAS studies that the active site has been conclusively identified, the information that is gained provides unique insight as to the nature of the working catalyst and the resulting structure-property relationship provide guidance for the development of improved catalysts
Co-ACCESS, is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Chemical Sciences, Geosciences and Biosciences Division
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