Departmental Papers (CBE)

Document Type

Technical Report

Date of this Version

1997

Publication Source

Catalyst Materials for High-Temperature Processes

Start Page

113

Last Page

118

Abstract

Transition metal catalysts such as Rh/Pt used in a three-way automotive catalytic converter have to perform reduction and oxidation functions at the same time. This can be accomplished only in a specific range of oxygen pressure and temperature. In order to maintain a constant partial pressure of oxygen in the vicinity of catalysts mixtures of ceria and zirconia are used. Ceria is an essential component due to its capability of storing oxygen under oxidizing and releasing oxygen under reducing conditions. However, this function deteriorates with time and eventually a catalytic converter stops working properly. It is not well understood why this particular mixture of oxides can achieve the role as a oxygen buffer and why its lifetime is limited. In order to address this issue and to understand the structural interplay at the ceria/zirconia interface, we studied the atomic structure of ultra-thin ceria layers deposited on single crystals of (001) oriented Y-stabilized zirconia (YSZ), in situ, during annealing in air using the synchrotron x-ray surface diffraction technique.

Copyright/Permission Statement

© 1997 The American Ceramic Society.

Comments

The volume in which this report appeared no. 73 in a larger series known as Ceramic Transactions.

Share

COinS
 

Date Posted: 20 December 2017