Utilizing metal-oxide and oxide-oxide interactions for improved automotive emissions control catalysts. Final report

Egami, Takeshi ; Vohs, John M.

Departments of Materials Science & Engineering and Chemical Engineering, University of Pennsylvania, Philadelphia, PA (United States)

关键词: Research Programs;    Chemical Reactions;    Catalytic Effects;    Interfaces;    Progress Report;   

DOI  :  10.2172/810694
RP-ID  :  NONE
RP-ID  :  FG02-96ER14682
RP-ID  :  810694

美国|英语

来源: UNT Digital Library

【 摘 要 】

The goal of this research program was to elucidate the structure-activity relationships associated with metal-metal oxide and metal oxide-metal oxide interfaces of relevance in automotive emissions control catalysts. Particular emphasis was placed on explaining the mechanism by which ceria (CeO{sub 2}) acts as an oxygen storage medium, oxygen transport on the surface and in the bulk of ceria, and how the ceria-zirconia interaction affects oxygen storage capacity and reactivity. These properties were studied using x-ray surface scattering, pulsed neutron scattering, termperature programmed desorption, x-ray photoelectron spectroscopy, and high-resolution electron energy loss spectroscopy. The overall research program was composed of two primary thrust areas: (1) detailed studies of the lattice and defect structures of ceria and mixed ceria-zirconias, and (2) surface science studies of the reactivity of ceria single crystals and ceria thin films supported on zirconia. A brief overview of the significant contribution made in each of these areas is given.