Spring 2019 ChemBE Seminar Series – Eric Stach (University of PA) “Using In-situ and Operando Methods to Characterize Working Catalysts”
Refreshments will be served at 10:00am.
Attendance taken at the conclusion of the presentation.
The field of electron microscopy has seen dramatic advances in the past decade, with the development of advanced electron optics such as aberration-correctors and source monchromators, new detector modalities and advances in sample manipulation and probing. In this talk, I will describe how electron microscopy can be used to relate the structure and composition of catalytic nanoparticles to their performance using real time methods. Specifically, I will describe how environmental transmission electron microscopy can be used to create real time movies of the nucleation, growth and growth termination of carbon nanotubes. Thereafter, I will detail new methods that are being developed to characterize working catalysts in operando conditions using a closed-cell micro reactor which allows imaging at atmospheric pressure. Finally, I will describe how this same micro reactor allows correlated measurements to be obtained from both electron microscopy and x-ray spectroscopy and diffraction using advanced synchrotron facilities such as those found at Brookhaven National Laboratory’s National Synchrotron Light Source-II.
Eric Stach is a Professor in the Department of Materials Science and Engineering at the University of Pennsylvania. He received his B.S.E from Duke University, M.S.M.S.E. from the University of Washington, his Ph.D. in Materials Science and Engineering from the University of Virginia. He has held positions as Staff Scientist and Principal Investigator at the National Center for Electron Microscopy at the Lawrence Berkeley National Laboratory, as Associate, then Full Professor at Purdue University, and as Group Leader at the Center for Functional Nanomaterials at the Brookhaven National Laboratory. He is a Co-founder and Chief Technology Officer of Hummingbird Scientific. He is also Secretary of the Board of Directors for the Materials Research Society.