Cerium-terbium mixed oxides as alternative components for three-way catalysts: a comparative study of Pt/CeTbOx and Pt/CeO2 model systems

By using a combination of oxygen buffering capacity (OBC) and oxygen storag e capacity (OSC) measurements, the redox behaviour of a Pt/CeToO(x) catalys t is compared to that of a classic model TWC system: Pt/CeO2. The results r eported here show that the redox efficiency of the Pt/CeTbOx catalyst is mu ch better, especially at low temperature operation conditions such as those occurring during the cold start of engines. The catalyst containing terbiu m also shows lower 'light-off temperatures for both methane and carbon mono xide oxidation. (C) 1999 Elsevier Science B.V. All rights reserved.