报告人:Franklin (Feng) Tao 教授
Catalysis is crucial for efficient chemical and energy transformations. Understanding catalysis at a molecular or even an atomic scale is the key step for designing a catalyst with high activity and selectivity. In situ/operando studies of a catalyst under a reaction condition and during catalysis allow for establishing a correlation between observed catalytic performance and its corresponding authentic surface of the catalyst during catalysis. Advances in tracking surface of catalysts with electron-based surface analytical techniques under a working condition or a semi-working condition was made. Ambient pressure X-ray photoelectron spectroscopy allows for tracking surface of a catalyst at high temperature in a gas phase with certain pressure and even a liquid phase. It has been used in examining surface of thermal catalysis and electrocatalysis in the last decade. I will describe instrumentation of lab-based AP-XPS and application of AP-XPS to study catalyst surfaces in gas phase of one reactant or mixture of all reactants of a catalytic reaction. Instrumentation of reaction cell design for simulating the fixed-bed flow reactor will be described. Data analysis and interpretation in terms of the difference between vacuum XPS and AP-XPS will be discussed. The applications of AP-XPS to catalysis can be categorized into in situ/operando of model catalysts, metal nanoparticle catalysts, and oxide nanoparticle catalysts. I will exemplify the applications of lab-based AP-XPS to studies of different types of catalysts under reaction conditions and during catalysis. In addition, I will discuss the existing challenges in applying this near-ambient pressure surface analytical technique to studies of catalysts under working conditions.
Franklin (Feng) Tao is a tenured Miller associate professor of chemical and petroleum engineering and chemistry at Department of Chemical and Petroleum Engineering and Department of Chemistry at University of Kansas. He received his PhD from Princeton University with a following postdoc fellow research at University of California-Berkeley and Lawrence Berkeley National Laboratory. His research interests include heterogeneous catalysis for chemical transformation of small hydrocarbons to chemical and fuel feedstock and environmental remediation, application of catalysis to energy transformation, synthesis and catalysis of single site metal and oxide catalyst, development and applications of in-situ and operando characterization instruments/techniques to fundamental studies of catalyst surfaces under reaction conditions and during catalysis. He published over 130 research articles. He received Eugene P. Wigner Fellowship (2010), finalist prize of Gerhard Ertl Young investigator award (2011), Paul Holloway award of AVS (2012), and NSF-career award and Miller research award (2014).