In Situ Industrial Bimetallic Catalyst Characterization using Scanning Transmission Electron Microscopy and X‐ray Absorption Spectroscopy at One Atmosphere and Elevated Temperature
Abstract
We have developed a new experimental platform for in situ scanning transmission electron microscope (STEM) energy dispersive X‐ray spectroscopy (EDS) which allows real time, nanoscale, elemental and structural changes to be studied at elevated temperature (up to 1000 °C) and pressure (up to 1 atm). Here we demonstrate the first application of this approach to understand complex structural changes occurring during reduction of a bimetallic catalyst, PdCu supported on TiO2, synthesized by wet impregnation. We reveal a heterogeneous evolution of nanoparticle size, distribution, and composition with large differences in reduction behavior for the two metals. We show that the data obtained is complementary to in situ STEM electron energy loss spectroscopy (EELS) and when combined with in situ X‐ray absorption spectroscopy (XAS) allows correlation of bulk chemical state with nanoscale changes in elemental distribution during reduction, facilitating new understanding of the catalytic behavior for this important class of materials.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 04, 2017
- Source ID
- 10.1002/cphc.201700425
Entities
People
- Eric Prestat
- M. Grace Burke
- Matthew A. Kulzick
- Mr. Eu‐pin Tien
- Mr. Matthew Smith
- Nestor J. Zaluzec
- Paul J. Dietrich
- Sarah Jane Haigh
Organizations
- Argonne National Laboratory
- Defense Threat Reduction Agency
- Engineering and Physical Sciences Research Council
- European Research Council
- Office of Science
- University of Manchester