284834 Methods to Study Catalysts Under Reaction Conditions

Tuesday, October 30, 2012: 8:30 AM
318 (Convention Center )
Fabio H. Ribeiro1, W. Nicholas Delgass1, Eric A. Stach2 and Jeffrey T. Miller3, (1)School of Chemical Engineering, Purdue University, West Lafayette, IN, (2)Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, (3)Chemical Sciences and Engineering, Argonne National Laboratory, Argonne, IL

The most useful way to probe a catalyst is under reaction conditions as its properties are usually dependent on the reaction environment.  The catalyst can be probed in order of usefulness and experimental difficulty as: 1- in situ, 2- operando or 3- under dynamic conditions.  We will discuss examples, including the description of experimental techniques, for all three modes with examples from water-gas shift and selective catalytic reduction with ammonia.  The methods discussed will include environmental transmission electron microscopy, x-ray absorption spectroscopy and infrared spectroscopy.  We make extensive use of model catalysts to take best advantage of these techniques. Metal catalysts deposited on non-porous supports of simple geometry are ideal to explore structure-property relationships.  They fulfill three requisites: 1-there is no porosity and thus all particles are accessible for observation by TEM 2-the supports have geometries that allow for profile TEM and studies on single metal particles, 3-the surface area is high enough for the usual characterization probes (e.g., chemisorption and kinetics).  In addition, surface density can be controlled and a tight particle size distribution can be achieved.

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See more of this Session: Novel Catalytic Imaging Techniques
See more of this Group/Topical: Catalysis and Reaction Engineering Division