Evaluation of New Mixed Oxides for Use as Sulfur Tolerant Exhaust Gas Catalysts;Final rept. 1 Sep 98-30 May 02

摘要

There has been a recognized need to develop sulfur tolerant materials that are appropriate for three-way catalysis (TWC). In addition, there is ongoing interest in fundamental studies concerning the interaction of oxygen, carbon monoxide, and carbon dioxide with ceria and ceria-containing materials that relate to oxygen storage capacity (OSC). The objectives of the present investigation were to evaluate relative sulfur tolerance of 1%Pt/CeO2 and 1%Pd/Ce0.75Zr0.25O2 and the metal-free support under conditions of TWC, to study the chemistry of CO interaction with ceria-containing materials under condition of OSC measurement and to study the nature and reactivity of different dioxygen species of the surface of sulfur-free and sulfur-containing ceria.