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Fundamental Studies of the Interaction of Pd and Rh Particles with Ceria and Ceria-Zirconia Surfaces in Model Planar atalysts


EMSL Project ID
40121

Abstract

Ceria and ceria-based oxides have been widely investigated as electronic promoters of activity, selectivity, and thermal stability in a variety of catalysts. Pd on ceria-based supports is an important catalyst system for a variety of applications, including the catalytic combustion of methane, diesel oxidation, and water gas shift reactions. Perhaps the most significant application of ceria, however, is in automotive three-way catalysts (TWCs), where it serves as a multi-functional support for Pd as well as Pt and Rh. While research and development efforts over many years have led to a number of advances, catalyst deactivation (due to metal particle growth, agglomeration, and encapsulation, for example) remains a major problem, and there is significant opportunity for mechanistic studies to yield new and useful insight in this area. Moreover, metal-support interactions play a major role in TWCs and heterogeneous catalysts in general, sometimes affecting catalytic performance dramatically. The overall objective of this work is thus to develop a better understanding of fundamental interactions between Pd and Rh metal particles and ceria-based supports. This information would be useful in the further development of TWCs and a variety of other catalytic and energy applications. EMSL is a leading facility for the fabrication of high-quality ceria-based supports for this research.

Project Details

Project type
Large-Scale EMSL Research
Start Date
2010-11-04
End Date
2011-09-30
Status
Closed

Team

Principal Investigator

Xiaoqing Pan
Institution
University of Michigan

Team Members

Obiefune Ezekoye
Institution
University of Michigan

George Graham
Institution
University of Michigan

Related Publications

abstract from contributed talk at 2012 APS March Meeting
Zhang S, MB Katz, K Sun, OK Ezekoye, MI Nandasiri, HW Jen, GW Graham, and XQ Pan. 2013. "Spatial Distribution Of Cerium Valence In Model Planar Pd/Ce0.7Zr0.3O2 Catalysts." Journal of Catalysis 300:201-204. doi:10.1016/j.jcat.2013.01.013